Innovative Measurement Electronics
PT320BC
Batching Controller
Instruction Manual
Rev. 2023/06/27
CONTENTS
Table of Contents
1 DESCRIPTION......................................................1
1.1 INTRODUCTION...................................................1
1.2 DEFINITIONS........................................................1
1.3 FEATURES............................................................2
1.4 SEQUENCE OF OPERATION..............................2
2 SPECIFICATIONS.................................................3
2.1 GENERAL..............................................................3
2.2 DIGITAL SECTION................................................3
2.3 ANALOGUE SECTION..........................................3
2.4 RS232/RS485 SERIAL OUTPUT..........................3
2.5 BCD OUTPUT (OPTIONAL)..................................6
2.6 ANALOGUE OUTPUT (2 OPTIONS)....................6
3 INSTALLATION.....................................................7
3.1 GENERAL RULES.................................................7
3.2 INPUT SENSITIVITY OF LOAD CELLS................7
3.3 CONNECTING THE LOAD CELL TO THE
INDICATOR...................................................................7
3.4 FRONT PANEL DESCRIPTION............................8
3.5 REAR PANEL DESCRIPTION..............................9
3.6 RELAY DESCRIPTION.......................................10
3.6.1 Coarse and fine control...............................11
3.7 GENERAL NOTES..............................................11
3.7.1 Errors at power on......................................11
4 FUNCTION SETTING.........................................12
4.1 OVERVIEW.........................................................12
4.2 FUNCTION DATA SETTING...............................14
4.2.1 Zero tracking...............................................14
4.2.2 Zero track delay time..................................14
4.2.3 Zero track delta band..................................14
4.2.4 Motion detection time..................................14
4.2.5 Motion detection band................................14
4.2.6 Multiplier or decimal point...........................14
4.2.7 Division.......................................................14
4.2.8 Maximum capacity......................................14
4.2.9 Resolution...................................................14
4.2.10 RS232/485 Baud rate...............................15
4.2.11 Zero band..................................................15
4.2.12 RS232/485 operating mode......................15
4.2.13 Unit............................................................15
4.2.14 Entering the second function setting level 15
4.2.15 Zero return range......................................15
4.2.16 Tolerance range........................................15
4.2.17 Discharge control time delay....................15
4.2.18 Tolerance check time delay......................16
4.2.19 Comparison inhibit time (coarse control). .16
4.2.20 Comparison inhibit time (fine control).......16
4.2.21 Digital filtering...........................................16
4.2.22 Digital filtering – second stage..................16
4.2.23 Digital filtering – second stage range.......16
4.2.24 Start delay time.........................................16
4.2.25 Enable free fall compensation..................16
4.2.26 Enable tolerance check............................17
4.2.27 BCD output rate (Option)..........................17
4.2.28 Automatic tare enable...............................17
4.2.29 Entering the third function setting level.....17
4.2.30 Automatic zero return...............................17
4.2.31 Tare at start operation..............................17
4.2.32 Start condition...........................................18
4.2.33 Auto tare condition....................................18
4.2.34 Tare delay time.........................................18
4.2.35 Tare check counter...................................18
4.2.36 Fine control delay.....................................18
4.2.37 Fine delay time..........................................18
4.2.38 Dribble batch control (on timer)................19
4.2.39 Dribble batch control (off timer)................19
4.2.40 Comparison check counter.......................19
4.2.41 Free fall compensation range...................19
4.2.42 Delay hold time.........................................19
4.2.43 Material re-batch.......................................19
4.2.44 ID code......................................................20
4.2.45 Batch production control...........................20
4.2.46 Batch start method....................................20
4.2.47 Return to normal weighing........................20
4.3 FUNCTION SETTING USING RS232/RS485.....21
4.3.1 Enter serial function setting mode..............21
4.3.2 Zero track delay time..................................21
4.3.3 Zero track delta band..................................21
4.3.4 Motion detection time..................................21
4.3.5 Motion detection band................................21
4.3.6 Decimal point..............................................22
4.3.7 Multiplier......................................................22
4.3.8 Division.......................................................22
4.3.9 Maximum capacity......................................22
4.3.10 RS232/RS485 baud rate...........................22
4.3.11 Zero band..................................................22
4.3.12 Unit............................................................23
4.3.13 Zero return range......................................23
4.3.14 Tolerance range........................................23
4.3.15 Discharge control time delay....................23
4.3.16 Tolerance check time delay......................23
4.3.17 Comparison inhibit time (coarse)..............23
4.3.18 Comparison inhibit time (fine)...................24
4.3.19 Digital filtering...........................................24
4.3.20 Digital filtering - second stage..................24
4.3.21 Digital filtering - second stage range........24
4.3.22 Start delay time.........................................24
4.3.23 Enable free fall compensation..................24
4.3.24 Enable tolerance check............................24
4.3.25 BCD output rate (Option)..........................25
4.3.26 Automatic tare enable...............................25
4.3.27 Automatic zero return...............................25
4.3.28 Tare at start operation..............................25
4.3.29 Start condition...........................................25
4.3.30 Auto tare condition....................................25
4.3.31 Tare delay time.........................................25
4.3.32 Tare check counter...................................26
4.3.33 Fine control delay.....................................26
4.3.34 Fine delay timer........................................26
4.3.35 Dribble batch control (on timer)................26
4.3.36 Dribble batch control (off timer)................26
4.3.37 Comparison check counter.......................26
4.3.38 Free fall compensation range...................26
4.3.39 Delay hold time.........................................27
4.3.40 Material re-batch.......................................27
4.3.41 ID code......................................................27
4.3.42 Batch Control (multiple batch enable)......27
4.3.43 Start Production Method...........................27
5 CALIBRATION.....................................................28
5.1 Notes...................................................................28
5.1.1 General.......................................................28
5.1.2 Notes during span setting...........................28
5.2 KEYPAD CALIBRATION.....................................28
5.2.1 Entering the calibration mode:....................28
5.2.2 Zero calibration...........................................28
5.2.3 Span calibration..........................................28
5.2.4 Error codes during calibration.....................28
5.3 CALIBRATION USING RS232/RS485................29
5.3.1 Enter serial calibration setting mode..........29
5.3.2 Zero calibration...........................................29
5.3.3 Span calibration..........................................29
6 SETPOINTS........................................................30
6.1 GENERAL............................................................30
6.1.1 Batching less than 4 materials....................30
6.2 KEYPAD SETPOINT SETUP..............................30
CONTENTS
6.2.1 Entering setpoint setup...............................30
6.2.2 Setting material setpoints...........................30
6.3 RS232/485 SETPOINT SETUP...........................30
6.3.1 Enter serial setpoint setting mode..............31
6.3.2 Final setpoint...............................................31
6.3.3 Coarse setpoint...........................................31
6.3.4 Fine setpoint...............................................31
6.3.5 Multiple batch repeat number.....................31
7 THE BATCHING OPERATION............................32
7.1 WEIGHING SYSTEM DIAGRAM.........................32
7.2 CONTROL TIMING DIAGRAM............................33
8 OPTIONS.............................................................34
8.1 BCD DATA OUTPUT INTERFACE (OPTIONAL)34
8.1.1 Pin description............................................34
8.1.2 BCD connector diagram..............................34
8.2 ANALOGUE OUTPUT (OPTIONAL)...................35
8.2.1 Specification................................................35
8.2.2 Pin no. description......................................35
8.2.3 Adjusting the analogue option board..........35
9 DIMENSIONS......................................................36
10 APPENDIX.........................................................37
10.1 PT320BC Function default value table..............37
Note. Items marked (optional) are optional features that can be purchased with the PT320BC at the
time of ordering and factory installed.
PT320BC instruction manual 1
1 DESCRIPTION
1.1 INTRODUCTION
The PT320BC is one of the smallest batching controllers in the world.
Using an up to-date delta-sigma A/D converter to achieve a higher speed and higher accuracy for
batching or packing systems. It has built in RS232 as standard or RS485 can be factory preset set as a
standard feature. Multi-drop or long distance communication is possible by using RS485. Sophisticated
software has provided for different batching system applications. The PT320BC is suitable for batching
a single recipe of up to 4 materials into a single weigh hopper.
1.2 DEFINITIONS
Automatic fine setpoint correction:
Fine setpoint(new) = fine setpoint(old) - [(final setpoint–result material net value) /2]
The correction is performed at the end of each batch process. The fine setpoint
value in memory is updated after all materials are batched, and the revised fine setpoint will be used in
the next batch sequence. No correction is made if fine setpoint(new) is negative.
Fine setpoint (new) is set to “coarse – 1” if fine setpoint (new) is equal to or greater
than the coarse setpoint. Fine setpoint(new) will be set to 999 if fine setpoint(new) is greater than 999.
Coarse setpoint:
The coarse setpoint is also referred to as the Preliminary setpoint or Prelim. amount. When the reading
of the PT320BC is greater than or equal to the final setpoint value less the coarse setpoint value, the
coarse output contact will be turned off.
Dead weight:
Dead weight is the self weight of the platform or scale load carrying structure on the load cells without
the contents or items to be weighed. The output voltage of the load cell in response to the weight of the
platform is usually the zero offset.
Division:
The ratio of step width to multiplier. The value of the division can only be one of the following: 1, 2, 5.
The external count increments by the division.
Excitation voltage:
The voltage that is supplied by the indicator to the load cell.
Final setpoint:
The target weight of the material to be batched.
F ine setpoint:
The Fine setpoint is also known as the freefall setpoint, it is initially set to the freefall weight obtained by
test or calculation. When the reading of the PT320BC is greater than or equal to the final setpoint value
less the fine setpoint value, the fine relay contact will turn off.
Free fall value:
The average increase in reading after the coarse and fine relay contact is turned off due to the free fall
of work in process material.
Live weight :
The weight that is applied to the scale and shown on the indicator.
Load cell:
Load cell is a device that converts force to electronic voltage. A load cell consists of two parts. The first
part is a sensor that can be linearly distorted according to the force applied to it. The second part is the
strain gauge element which changes its resistance according to the distortion of the sensor.
Load cell rated output:
The output voltage from the load cell divided by the excitation voltage at load cell rated capacity. This is
usually expressed in mV/V.
Maximum capacity:
The maximum figure, ignoring decimal point, that the indicator will be calibrated to display.
PT320BC instruction manual 2
Multiplier:
The multiplier determines the position of the decimal point or the number of tailing zeros added to the
internal count or reading.
For example:
If the internal reading is 234,
Multiplier Display on indicator
10 2340
1 234
.1 23.4
.01 2.34
.001 .234
.0001 .0234
Resolution:
The ratio of the maximum capacity to step width. This is usually expressed in divisions or counts.
Span:
The change of reading from the indicator in response to the change of standard
weight applied. Full span is the change when full load or maximum capacity is applied.
Step width:
The difference between two consecutive readings of the scale. Equal to the division times the multiplier.
TDC:
Time delay for discharge control. During the discharge process, the discharge control will be
deactivated 0.1 to 9.9 seconds after the gross weight has reduced to be within the zero band. Setting
range is 01to 99 (i.e. 0.1 seconds to 9.9 seconds).
TTC:
Time delay for tolerance check. During the batching process, tolerance will be checked with 0.1 to 9.9
seconds delay after the fine control is turned off. Setting range is 01 to 99 (i.e. 0.1 seconds to 9.9
seconds).
1.3 FEATURES
●Dual display-showing both gross and net weight simultaneously.
●One of the smallest batching controllers, panel size is only 96mm × 48mm.
●Weight indicator is integrated with the setpoint controller.
●Provides a complete material batching control function.
●Controls up to 4 different kinds of materials.
●All setpoints are keyed-in through the front panel keyboard and stored in internal memory.
●All setpoint values are saved during power down.
●Automatic zero tracking.
●Automatically set tare by push button.
●Automatically calculate freefall.
●Coarse feed, fine feed and free fall compensation.
●Software function setting method.
●Batch report output through RS232/RS485.
●Conversion rate up to 200 times/sec.
●Higher accuracy of weighing scale-display resolution up to 1/15000.
●RS232/RS485 input can be used to set setpoint data and system function data.
●Discharge control is provided.
●Tare check cycle is programmable by function setting.
●Temperature coefficient is less than (0.0008% of reading +0.3 digits)/C.
○Optional analog output.
○Optional BCD output.
○Optional serial printer.
1.4 SEQUENCE OF OPERATION
REFER TO 7 :THE BATCHING OPERATION
PT320BC instruction manual 3
2 SPECIFICATIONS
2.1 GENERAL
1. Mains supply : 110VAC, 220VAC±10%, 50/60Hz
2. Power consumption : 9 VA, built in line filter
3. Operating temperature : -10ºC to 50ºC(14ºF to 122ºF)
4. Relative Humidity : 90%(non-condensing)
5. Weight : Approx 0.45 kg
2.2 DIGITAL SECTION
1. Weight display : 2 x 6 digits LED display
2. LED display : Dual display for gross and net weight
3. Display height : 13mm, 10mm
4. Annunciators : GM1, M2, M3, M4, Zero, Motion
5. Negative sign indication : “-” on the left most digit
6. Over-range indication : Displays “O.L” or “-O.L”
7. Maximum capacity : 500 to 100,000
8. Step width : 1, 2, 5, 10, 20 or 50
9. Decimal point : Displays 0, 1, 2, 3, 4 decimal places
10. Output switching capacity : open collector output max. 80V, 0.3A
Operating 5~24V, 0.3A
2.3 ANALOGUE SECTION
1. Load cell type : All strain gauge load cells
2. Load cell supply : 10VDC±5%, 150mA
3. Input sensitivity : 0.5μV/D to 200μV/D, max. 20mV input
4. Input resistance : More than 10MΩ
5. Zero point adjustment : 0.05mV to 15mV
6. Span stability : ±(8ppm of reading + 0.3 digits)/ K
7. Non-linearity : Within 0.0067% of F.S
8. Conversion method : Delta-sigma
9. Conversion rate : Up to 200 times/sec
10.Internal resolution : 1,000,000
11.Maximum display resolution : 300~10,000 divisions
12.Comparison cycle : Approx 200 times/sec
13.Dielectric strength
-Between input terminal(common/earth/each opto-coupler
output/analogue output/BCD output), for 1 min. : 500VDC
-Between power supply terminal and input
terminal(common/earth/each opto-coupler
output/analogue output/BCD output), for 1 min. : 1500VAC
2.4 RS232/RS485 SERIAL OUTPUT
1. Standard : EIA-RS232/RS485 output
2. Stream format : 7 Data bits, 1 stop bit, even parity
a) Baud rate : 2400, 4800, 9600, 19200
b) Data type : ASCII code
c) Delimiter : CR/LF
3. Communication mode
a) Command mode (PRO):
-After receiving the command word from the RS232/RS485 port, the indicator will carry out the
appropriate action.
Output Messages From the PT320BC
Commands Description
1. Z.TRACK T = 0 zero track delay time is off
2. Z.TRACK T = 1 zero track delay time is 1 sec
3. Z.TRACK D = 1 zero track delta band is 1 step width
4. Z.TRACK D = 2 zero track delta band is 2 step width
5. Z.TRACK D = 4 zero track delta band is 4 step width
6. MOTION 1D/S motion detection is 1 step width / sec
PT320BC instruction manual 4
7. MOTION 3D/S motion detection is 3 step width / sec
8. D.P 4 multiplier is 0.0001
9. D.P 3 multiplier is 0.001
10. D.P 2 multiplier is 0.01
11. D.P 1 multiplier is 0.1
12. D.P 0 multiplier is 1
13. d 1 division is 1
14. d 2 division is 2
15. d 5 division is 5
16. MAX.CAP 500 maximum capacity is 500
17. MAX.CAP xxxxx maximum capacity is xxxxx, range of xxxxx is 500 to 100000
18. MAX.CAP 100000 maximum capacity is 100000
19. BAUD 2400 baud rate is 2400
20. BAUD 4800 baud rate is 4800
21. BAUD 9600 baud rate is 9600
22. BAUD 19200 baud rate is 19200
23. Z.BAND x zero band is x%. Range of x is 1 to 10
24. UNIT kg unit is kg
25. UNIT t unit is ton
26. UNIT OFF unit off
27. CAL ZERO zero calibration is carried out
28. CAL SPAN span calibration carried out
29. M1 FINAL xxxxx the final set point for material 1 is xxxxx
30. M2 FINAL xxxxx the final set point for material 2 is xxxxx
31. M3 FINAL xxxxx the final set point for material 3 is xxxxx
32. M4 FINAL xxxxx the final set point for material 4 is xxxxx
33. M1 COARSE xxxx the coarse set point for material 1 is xxxx
34. M2 COARSE xxxx the coarse set point for material 2 is xxxx
35. M3 COARSE xxxx the coarse set point for material 3 is xxxx
36. M4 COARSE xxxx the coarse set point for material 4 is xxxx
37. M1 FINE xxx the fine set point for material 1 is xxx
38. M2 FINE xxx the fine set point for material 2 is xxx
39. M3 FINE xxx the fine set point for material 3 is xxx
40. M4 FINE xxx the fine set point for material 4 is xxx
41. YES no error occur or confirm true
42. NO incorrect command received or confirm false command
43. ERROR x error number x occurs during calibration
44. TARE xxxx send the value of tare. (xxxx is the current tare weight,
yyyy yyyy is the tare weight for batching)
45. ZERO xxxx send the zero correction value x step width
46. OL, NT, +0123.45kg, Reply to read inquiry, meaning of symbols below.
OL = overload
ST = stable
US = unstable
NT = net weight
GS = gross weight
CRLF = advance to the next line
47. RLY 1 Output of material1 is activated by RLY command
48. RLY D Output of discharge control is activated by RLY
49. TOL 3 tolerance range is 0.3%
50. ZERO x percentage of zero return range is x
51. TOL xx percentage of out of tolerance range is xx
52. TTC xx Time delay for tolerance check
53. TDC xx Time delay for discharge control
54. BCD xx BCD output rate
55. CIT xx Compare inhibit time (No. of batch interval)
56. FILTER xx Digital filtering
57. SDT xx Start delay time
58. EFF xx Enable free fall compensation
59. ETC xx Enable tolerance check
60. ATE xx Automatic tare enable
PT320BC instruction manual 5
Input Commands to the PT320BC:
Commands Description
1. FUNC Set PT320BC to function setting mode.
2. CAL Set PT320BC to calibration mode.
3. SET Set PT320BC to setpoint setting mode
4. READ Request measured data
5. TARE What is the value of tare
6. TARE ON Set tare
7. TARE OFF Reset tare
8. ZERO What is the value of the zero offset value
9. ZERO ON Set zero offset
10. ZERO OFF Reset zero offset
11. PROG Set RS232/RS485 operation mode as command mode
12. AUTO Set RS232/RS485 operation mode as automatic mode
13. CONT Set RS232/RS485 operation mode as continuous mode
14. RLY Which output is activated by RLY command
15. RLY 1 Activate output for material 1 (output can be activated
only when PT320BC is in normal weighing mode. 1,2,3,4
represent the output for corresponding material No.
C for coarse output, F for fine output, D for discharge output,
T for out of tolerance). Only 1 relay can be active at a time.
16. RLY OFF Turn off any output that turned on by RLY command
17. ABO Abort production
18. ST Start production
19. KEY ON Key protection on (key function inhibit)
20. KEY OFF Key protection off (key function enable)
21.DSEL AUTO Auto mode is being used
22.DSEL GROSS Gross mode is being used
23.DSEL NET Net mode is being used
NOTE: All command must be terminated with <CR><LF>, e.g. READ command is "52, 45, 41, 44,
0D, 0A" in ASCII code.
After the ABO command the hopper gate will be closed and material may remain in the
hopper. To empty the hopper issue the commands RLY D followed by RLY OFF when empty (checked
by READ).
BATCH REPORT FROM the PT320BC:
M1,NT,+ 19.99kg<CR><LF>
M1,NT,+ 20.00kg<CR><LF>
M1,NT,+ 10.00kg<CR><LF>
M1,NT,+ 15.00kg<CR><LF>
b) Command mode (PRO):
-After all materials are batched, a "ENQ" message will send out through the RS232/RS485.
When "ACK" command is received by the PT320BC, the batch report will be sent out through
RS232/RS485. There is no report transmission if the start command is activated before the
"ACK" command is received. The No. of times a report is output is not limited, the report will be
cleared when the next production is started.
c) Continuous mode (CONT):
-The data will be transmitted constantly without any input command to the RS232/RS485 port. Also the
batch report will transmit automatically after batching is completed.
d) Automatic mode (AUTO):
-A read command is required for reading weighing data from the PT320BC. Also the batch report
will transmit automatically after batching is completed.
4. Data format
a) STATUS 1 : M1 = material 1, M2 = material 2, M3 = material 3, M4 = material 4
b) STATUS 2 : NT = net weight, GS = gross weight, AB = abort
c) WEIGHING DATA : A stream of eight bytes consisting of "0" to "9", negative sign "-",
positive sign "+", space " " and decimal point.
d) UNIT : kg = kilogram, t = ton
, , CR LF
STATUS 1
(2 BYTES)
STATUS 2
(2 BYTES)
WEIGHT DATA
(8 BYTES)
UNIT (KG/t)
(2 BYTES)
Note 1:The material net value of each material is
stored, then it is simultaneously output only once
after the final material net is captured.
Note2: That the material is not output when the final
value is set to zero.
PT320BC instruction manual 6
5. Schematic diagram of the serial port.
2.5 BCD OUTPUT (OPTIONAL)
1. BCD output : Parallel BCD output
2. BCD output level : 5V TTL or open collector
2.6 ANALOGUE OUTPUT (2 OPTIONS)
1. Analogue output, voltage option : 0~5V
2. Analogue output, current option : 0~20mA/4~20mA
The excitation current specification will be reduced to 120mA if the 0~20mA/4~20mA output board is
used.
NOTE: An analogue option and the BCD option cannot be used together.
TXD
RCD
RCD
TXD
COM
RS232
(-)
(+)
RS485
PT320BC
Computer or
other device
PT320BC instruction manual 7
3 INSTALLATION
3.1 GENERAL RULES
Do not install the PT320BC in direct sunshine, and avoid sudden temperature changes, vibration or wind.
The best environment is when the temperature is about 20C or 68ºF and the relative humidity is about
50%.
Ground the PT320BC via the power cable to the rear terminal and ensure a good ground connection. Do
not ground directly to other equipment.
Analogue input/output signals are sensitive to electrical noise. Do not bind these cables together as it
could result in cross-talk interference. Please also keep them well away from AC power cables, and keep
all cables as short as possible.
If the local AC electrical supply fluctuates by more than ±10% an AC regulator must be used in order to
stabilize the power and reduce power spikes.
3.2 INPUT SENSITIVITY OF LOAD CELLS
The input sensitivity (A) of the load cells can be calculated from the following formula:
A = (Live weight of the scale)/(Number of load cells)/(Load cell capacity)*(Load cell mV/V at capacity)
*(Excitation voltage)*(1000 for microvolts)/(Scale resolution in divisions)
Alternatively
A = (Load cell output voltage at scale capacity - load cell output voltage at dead load) × Step width /
Scale capacity
The PT320BC requires that “A” must be greater than or equal to 0.5μV/D.
Note: The maximum input voltage is 20mV. Load cells should be installed with some reserve capacity for
unexpected loading. The excitation is 10V meaning that for 3mV/V load cells the full capacity signal is 30
mV. In order not to exceed the maximum input voltage of 20 mV the load cell capacity would therefore
need to be 1.5 times the maximum operational load (dead weight + live weight). This provides a
satisfactory safety margin also.
3.3 CONNECTING THE LOAD CELL TO THE INDICATOR
The analogue output from the Load cell and the RS232/RS485 input/output signals are sensitive to
electrical noise. Do not bind these cables together as it could result in cross-talk interference. Please also
keep them well away from the AC power cables.
Load cell connections
Pin no. Signal
EXC+
EXC-
SIG+
SIG-
SHD
Excitation+
Excitation -
Signal +
Signal -
Shield
SHDEXC-EXC+SIG-SIG+
PT320BC
EXC+
EXC-
SIG- SIG+
PT320BC instruction manual 8
3.4 FRONT PANEL DESCRIPTION
5
1
2
3
4
6
7 8 9 10
1. M1 annunciator : Indicates material 1 in process.
2. M2 annunciator : Indicates material 2 in process.
3. M3 annunciator : Indicates material 3 in process.
4. M4 annunciator : Indicates material 4 in process.
5. ZERO annunciator : Indicates zero.
6. MOTION annunciator : Indicates motion detection.
7. ENTER button : Accepts data entry.
8. MODE button : Selects the function setting mode.
9. TARE button : If motion is not being detected and discharge
relay is in off state, the tare weight will be
memorized and the indicator displays zero.
This button charges the display mode to NET
mode.
10. ZERO button : If the offset from the initially calibrated zero is
within 1% to 10% (refer to Function setting) of the
maximum capacity and no motion is being
detected, the indicator will display zero weight
by pressing this key.
PT320BC BATCHING CONTROLLER
ENTER MODE TARE ZERO
MOTION
ZERO
M1
M2
M3
M4
PT320BC instruction manual 9
3.5 REAR PANEL DESCRIPTION
CONNECTION ID SIGNAL
Top Connector
M1 Material 1 output
M2 Material 2 output
M3 Material 3 output
M4 Material 4 output
COARSE Coarse output
FINE Fine output
DISCHARGE Discharge output
TOLERANGE Out of tolerance output
EMTR COM Common
TXD RS232/RS485 transmission output
RXD RS232/RS485 receive input
COM Digital Ground
+ Analog output voltage (option)
COM Analog Ground
Bottom Connector
SIG+ Load cell signal +
SIG- Load cell signal -
EXC+ Load cell excitation +
EXC- Load cell excitation -
SHIELD Shielding for load cell
START Production start activate
COM Start com
EARTH Electric earth
AC AC input
AC AC input
The output capacity is 5V to 24V open collector and the max. current is 0.3A. DC operated buffer relay
should be used to isolate PT320BC from external controlled devices in order to reduce interference. Diode
should be connected in parallel with the coil of the DC operated buffer relay to suppress any spark noise
caused by contact switching.
M 1
M 2
M 3
M 4
COARSE
FINE
DISCHARGE
TOLERANCE
EMTR COM
TXD (+)
RXD (-)
COM
+
COM
SIG+
SIG-
EXC+
EXC-
SHIELD
START
COM
EARTH
AC
AC
PT320BC
DIODE
POWER
SUPPLY
6V/12V/+24V
GND
BUFFER RELAY
The production
start button
M1
EMTR COM.GND
M1 Material 1
M2 Material 2
M3 Material 3
M4 Material 4
Coarse
Fine
Discharge
Tolerance
START
COM
PT320BC instruction manual 10
3.6 RELAY DESCRIPTION
General relay arrangement
Connection to PT320BC
The production start button should be momentary switch and production is initiated immediately. When the
button is pushed and then released. The material contacts (M1 to M4) in the PT320BC are actuated one by
one according to the setpoint entered.
6/12/24V POWER SUPPLY
M2
M3
M4 (MEDIUM)
COARSE
FINE
DISCHARGE
TOLERANCE
-ve +ve
M3
M4
M1
M2
M3
M4
+24V
M1 Coarse
M2 Coarse
M3 Coarse
M4 Coarse
M1 Fine
M2 Fine
M3 Fine
M4 Fine
COARSE
FINE
PT320BC instruction manual 11
3.6.1 Coarse and fine control
The coarse and fine batching control can be implemented by the following relay logic.
In all circumstances, the buffer relays should be DC Operated and make sure that
the contact rating of buffer relays is adequate to drive the corresponding starter or
power controlling device. Diode suppressors should be connected in parallel with the
coil of every DC operated buffer relay.
If AC operated relays are needed, RC suppressors should be connected in parallel with the
relay coil. It also applies to those controlling devices that are inductive in nature. (E.G.
solenoid valves).
3.7 GENERAL NOTES
●If there has been a disruption to the power supply or disconnection the power cable, the indicator will
flag that there has been a power interruption with the display “888888”, if this display occurs at any
other time you should regard it as a warning that volatile memory (weighing event data) will have
been lost. Please allow a warm-up period to achieve thermal stability in the load cell and indicator.
Zero will drift initially. To sustain thermal stability you should keep the indicator on.
●Set and calibrate the indicator as described in the function setting, the setpoint setting and calibration
section.
●When the production start button as shown in connection for control output and input is pressed and
then released, production is immediately started and materials are batched one by one based on the
setpoints entered (i.e. from M1, M2, M3, M4).
●The display will blank and show oL when the input signal exceeds the maximum capacity by more
than 9 step widths. The display will also show the same indication is no load cell is connected or the
input voltage is too far below zero.
3.7.1 Errors at power on
The PT320BC will display LoSt if there is an error encountered during the diagnostic function at power
on. For any LoSt message other than below, return the unit to the manufacturer.
●LoSt Func :Function settings are lost or corrupted, check and set functions.
●LoSt cAL :Calibration settings are lost or corrupted, check and re-calibrate.
●LoSt Set :Setpoint settings are lost or corrupted, check and re-set.
24V POWER SUPPLY
M1
M2
PT320BC
PT320BC instruction manual 12
4 FUNCTION SETTING
4.1 OVERVIEW
Enter function setting: Press and hold ENTER key, then press the MODE key, 2 seconds later, “FUNC” is
displayed, the function setting mode is selected and data can be set.
If multiplier, maximum capacity or division data is changed, enter the calibration mode to verify/perform
calibration as calibration may have altered.
Key description:
key : Selects the digit to be modified. The decimal point of the selected digit will flash
key : Changes the data value of the selected digit.
key : Accepts the data and moves to the next function.
key : Stores the data and returns to the weighing mode.
Note:
(1) Data setting using RS232/RS485 is possible with a serial option installed and using
a simple terminal program such as hyperterminal or seyon.
(2) If an error occurs, “ERROR X” will be output from the RS232/RS485 port.
(3) When a “check sum” error occurs or there is a function change of “max.cap”, “mult” or “step”, the
PT320BC is put into the “CAL” re-set mode (the message is automatically displayed). However the
power supply may need to be turned off/on during that state, the PT320BC will return to the
weighing mode and “CAL” mode must be entered manually.
Function setting must be within the parameters of the instrument.
•The total divisions (capacity divided by the increment or step) cannot exceed 15000.
•The minimum number of divisions is 300.
•The voltage input per division (increment, step) must not be less than the minimum input sensitivity
of 0.5μV/D.
The dual display of the PT320BC makes function setting convenient. The lower display indicates the function
being set and the upper display is used to indicate and modify the function data. An example is shown below.
Press “MODE” key to go to the next step.
Some data is modified by changing the selection with the TARE key. For instance select “0.5”, “1.0”,
“1.5”, “2.0”, “2.5”, “3.0”, “3.5”, “4.0”, “4.5” or “5.0”, the value will change each time the TARE key is pressed.
Press MODE to accept the selection and proceed.
Some data is modified by changing each digit, the digit is selected with the ZERO key and changed with
the TARE key. Press MODE to accept the selection and proceed.
There are 2 levels of function setting, to enter the second level press the ZERO key.
ZERO
TARE
MODE
ENTER
MODE
PT320BC instruction manual 13
To aid setting of the PT320BC a tables below show settings of MULTIPLIER, DIVISION and MAXIMUM
CAPACITY for various capacities and increments.
MULTIPLIER 0.0001 0.001 0.01
DIVISION d 1 2 5 1 2 5 1 2 5
Increment or s tep 0.0001 0.00 02 0.0 005 0.001 0.002 0.0 05 0.01 0.0 2 0.0 5
500 0.05 00 ERR ERR 0.50 0 ERR ERR 5.00 ERR ERR
1000 0.100 0 0.10 00 ERR 1.000 1.00 0 ERR 10 .0 0 10.0 0 ERR
1200 0.120 0 0.1200 ERR 1.200 1.200 ERR 12.00 12.00 ERR
1500 0.150 0 0.15 00 0.1500 1.50 0 1.500 1.50 0 15.0 0 15.0 0 15.0 0
2000 0.200 0 0.20 00 0.2000 2.00 0 2.000 2.00 0 20.0 0 20.0 0 20.0 0
2500 0.250 0 0.25 00 0.2500 2.50 0 2.500 2.50 0 25.0 0 25.0 0 25.0 0
3000 0.300 0 0.30 00 0.3000 3.00 0 3.000 3.00 0 30.0 0 30.0 0 30.0 0
MAXIMUM 4000 0.400 0 0.4 000 0.4 000 4.00 0 4.00 0 4.00 0 40 .00 4 0.00 40.00
CAPACITY 5000 0.50 00 0.50 00 0.5000 5.000 5.0 00 5.00 0 50 .00 50.00 50.0 0
6000 0 .600 0 0.6 000 0.6 000 6.00 0 6.00 0 6.00 0 60 .00 6 0.00 60.00
8000 0.800 0 0.80 00 0.8000 8.00 0 8.000 8.00 0 80.0 0 80.0 0 80.0 0
10000 1.00 00 1.00 00 1.0 000 10 .0 00 10.0 00 10 .000 10 0.0 0 100 .00 10 0.00
12000 1.200 0 1.2000 1.200 0 12.00 0 12.00 0 12.00 0 120 .00 120 .00 120.00
15000 1.50 00 1.50 00 1.5 000 15 .0 00 15.0 00 15 .000 15 0.0 0 150 .00 15 0.00
20000 ERR 2.00 00 2.00 00 ERR 20.0 00 20.00 0 ERR 20 0.00 200 .00
25000 ERR 2.50 00 2.50 00 ERR 25.0 00 25.00 0 ERR 25 0.00 250 .00
30000 ERR 3.00 00 3.00 00 ERR 30.0 00 30.00 0 ERR 30 0.00 300 .00
40000 ERR ERR 4.0 000 ERR ERR 40.00 0 ERR ERR 400 .00
50000 ERR ERR 5.0 000 ERR ERR 50.00 0 ERR ERR 500 .00
60000 ERR ERR 6.0 000 ERR ERR 60.00 0 ERR ERR 600 .00
80000 ERR ERR ERR ERR ERR ERR ERR ERR ERR
100000 ERR ERR ERR ERR ERR ERR ERR ERR ERR
d.p.
cAPA
MULTIPLIER 0.1 1 10
DIVISION d 1 2 5 1 2 5 1 2 5
Increment or s tep 0 .1 0.2 0 .5 1 2 5 10 20 50
500 50.0 ERR ERR 5 00 ERR ERR ERR ERR ERR
1000 100.0 100.0 ERR 100 0 100 0 ERR ERR ERR ERR
1200 120.0 120.0 ERR 1200 1200 ERR ERR ERR ERR
1500 150.0 150.0 150.0 1500 150 0 1500 ERR ERR ERR
2000 200.0 200.0 200.0 2000 200 0 2000 ERR ERR ERR
2500 250.0 250.0 250.0 2500 250 0 2500 ERR ERR ERR
3000 300.0 300.0 300.0 3000 300 0 3000 3000 ERR ERR
MAXIMUM 4000 400 .0 400.0 400 .0 4 0 00 40 0 0 4 000 4000 ERR ERR
CAPACITY 5000 500.0 500.0 500.0 5000 5000 500 0 5000 ERR ERR
6000 600 .0 6 0 0 .0 600 .0 6 0 00 6000 600 0 6000 600 0 ERR
8000 800.0 800.0 800.0 8000 800 0 8000 8000 8000 ERR
10000 1000.0 1000.0 1000.0 100 0 0 10000 1000 0 10000 10000 ERR
12000 1200.0 1200.0 1200.0 12000 12000 120 0 0 120 0 0 12000 ERR
15000 1500.0 1500.0 1500.0 150 0 0 15000 1500 0 15000 15000 15000
20000 ERR 200 0 .0 20 0 0 .0 ERR 20000 20000 20000 20000 200 00
25000 ERR 250 0 .0 25 0 0 .0 ERR 25000 25000 25000 25000 250 00
30000 ERR 300 0 .0 30 0 0 .0 ERR 30000 30000 30000 30000 300 00
40000 ERR ERR 4000.0 ERR ERR 40 0 00 40000 4 0000 4 0000
50000 ERR ERR 5000.0 ERR ERR 50 0 00 50000 5 0000 5 0000
60000 ERR ERR 6000.0 ERR ERR 60 0 00 60000 6 0000 6 0000
80000 ERR ERR ERR ERR ERR ERR 800 00 80000 80 0 00
100000 ERR ERR ERR ERR ERR ERR ### ### ###
d.p.
cAPA
PT320BC instruction manual 14
4.2 FUNCTION DATA SETTING
Entering the data setting mode:
•Press and hold the ENTER key, then press the MODE key, 2 seconds later, “FUNC” displays.
•Press MODE to move to the next setting.
•To exit the setting mode press ENTER.
Setting data:
Data level selection is performed with the ZERO key.
•Continue pressing TARE until the desired parameter appears.
•Change the parameter setting/value with the TARE key.
•The MODE key accepts the setting and moves on to the next function.
•If no change is required press the MODE key to move to the next function.
•To save the data AND EXIT press ENTER.
4.2.1 Zero tracking
Zero tracking requires 2 parameters, the zero delta band and the zero delay time. When the ZERO key is
pressed the PT320BC will track the reading to zero if the reading is within the delta band for a period greater
or equal to the delay time.
4.2.2 Zero track delay time
While tr-t is shown in the lower display select select the delay in seconds from “0.5”, “1.0”, “1.5”, “2.0”, “2.5”,
“3.0”, “3.5”, “4.0”, “4.5” or “5.0” shown in the upper display with the TARE key, press MODE to continue,
ENTER to save and exit.
4.2.3 Zero track delta band
While tr-d is shown in the lower display select select the step width from “0.5”, “1.0”, “1.5”, “2.0”, “2.5”, “3.0”,
“3.5”, “4.0”, “4.5” or “5.0” shown in the upper display with the TARE key, press MODE to continue, ENTER to
save and exit.
4.2.4 Motion detection time
While Mo-t is shown in the lower display select the change period in seconds within which the motion
detection band is examined to determine if the reading is stable. Select from “1”, “2” or “off” shown in the
upper display with the TARE key, press MODE to continue, ENTER to save and exit. Off means motion
detection is disabled.
4.2.5 Motion detection band
While Mo-d is shown in the lower display select the motion detection step width of “1”, “2”, “5” or “10” shown
in the upper display with the TARE key, press MODE to continue, ENTER to save and exit. The motion
annunciator will illuminate as long as the reading changes by the selected step width within the selected
motion detection time. For example if Mo-t =2 and Mo-d =5 then the motion annunciator will be lit if the
reading changes by equal to or more than 5 steps in 2 seconds.
4.2.6 Multiplier or decimal point
While d.p is shown in the lower display select the desired position of the decimal point from “oooo0”,
“oooooo”, “ooooo.o”, “oooo.oo”, “ooo.ooo”, “oo.oooo”, shown in the upper display with the TARE
key, press MODE to continue, ENTER to save and exit.
4.2.7 Division
While d is shown in the lower display select the desired division from “1”, “2” or “5” shown in the upper
display with the TARE key, press MODE to continue, ENTER to save and exit.
Step width = division × multiplier
4.2.8 Maximum capacity
While cAPA is shown in the lower display select the desired capacity from “500” to “100000” shown in the
upper display with the TARE key, press MODE to continue, ENTER to save and exit. The capacities are
shown in the tables on page 13.
4.2.9 Resolution
The resolution (Step width / Maximum capacity) must be between 1/300 and 1/15000. The Multiplier, Division
and Maximum capacity must be chosen so that this condition is met. The tables on page 13 can be used to
assist these settings.
PT320BC instruction manual 15
4.2.10 RS232/485 Baud rate
While bAud is shown in the lower display select the desired baud rate from “2400”, “4800”, “9600”, “19200”
shown in the upper display with the TARE key, press MODE to continue, ENTER to save and exit.
4.2.11 Zero band
While zEro b is shown in the lower display select the desired zero band from “1” to “100” shown in the upper
display with the TARE key, press MODE to continue, ENTER to save and exit. 1 represents 0.1% and 100
represents 10%. If the final weight is 100kg and zero band is set to 1%, the discharge signal will be
deactivated when the gross weight is less then 1% of the final weight.
4.2.12 RS232/485 operating mode
While rS-- is shown in the lower display select the desired operation mode from “cont”, “pro”, “auto” shown
in the upper display with the TARE key, press MODE to continue, ENTER to save and exit.
“cont” : Continuous mode. Weighing data will be sent without any command input. After batching is
completed, the batching report will be sent also without any command.
“pro” : Program Mode. After receiving a “ read ” command, the PT320BC sends out the weighing
data. After batching is completed, the PT320BC sends out an “ENQ” (i.e. “05” in ASCII code). If the “ACK”
command is received before the next production is activated , then the PT320BC sends out the batching
report . The No. of times of report is output is not limited, the report will be cleared when next production is
started.
“auto”: Automatic Mode. After receiving a “READ” command, the PT320BC sends out the weighing
data. After batching is completed, the PT320BC sends out the batching report without any command input.
4.2.13 Unit
While unit is shown in the lower display select the desired units from “-9”, “t”, “oFF” shown in the upper
display with the TARE key, press MODE to continue, ENTER to save and exit. “-9” = “kg”.
4.2.14 Entering the second function setting level
Press ZERO to enter the second level of function setting.
4.2.15 Zero return range
While zEro r is shown in the lower display select the desired zero offset cancellation allowable from “1” to
“100” shown in the upper display with the TARE key, press MODE to continue, ENTER to save and exit. 1 =
1%, 100 = 100%. This is the maximum amount of zero offset that can be suppressed (returned to zero) by a
press of the ZERO key.
4.2.16 Tolerance range
While tol is shown in the lower display select the
desired tolerance from “0.1” to “9.9” shown in the upper
display with the TARE key, press MODE to continue,
ENTER to save and exit. This is in % of the final weight.
4.2.17 Discharge control time delay
While tdc is shown in the lower display select the
desired time delay from “0.1” to “9.9” shown in the upper
display with the TARE key, press MODE to continue,
ENTER to save and exit. This is in seconds. For discharge
control this is the time delay after the gross weight has
reached the zero band during discharge, at which point
the discharge control output will be deactivated.
Weight
Time
Start
Fine
Free
Fall
Tolerance Check
Discharge
Tolerance
range
Start
Discharge
Weight
Time
Zero band
tdc
Fine
Free
Fall
Tolerance Check
PT320BC instruction manual 16
4.2.18 Tolerance check time delay
While ttc is shown in the lower display select the
desired time delay from “0.1” to “9.9” shown in the upper
display with the TARE key, press MODE to continue,
ENTER to save and exit. This is in seconds. The final
weight will be checked to see if it is within tolerance after
a valid “Enable tolerance check” signal and the tolerance
check time delay period has passed.
4.2.19 Comparison inhibit time (coarse control)
While cIt.c is shown in the lower display select the
desired inhibit time from “0.1” to “9.9” shown in the upper
display with the TARE key, press MODE to continue,
ENTER to save and exit. This is in seconds. When the
feed gate is opened or closed the weight can vary
considerably and may cause an invalid control signal.
The comparison inhibit time delays the start of weight
comparison and will result in better accuracy and stability.
4.2.20 Comparison inhibit time (fine control)
While cIt.f is shown in the lower display select the
desired inhibit time from “0.1” to “9.9” shown in the upper
display with the TARE key, press MODE to continue,
ENTER to save and exit. This is in seconds. When the
feed gate is opened or closed the weight can vary
considerably and may cause an invalid control signal.
The comparison inhibit time delays the start of weight
comparison and will result in better accuracy and stability.
4.2.21 Digital filtering
While d.FLtr is shown in the lower display select the desired digital filter setting from “0”, “2”, “4”, “8”, “16”,
“32”, “64”, “128” or “256” shown in the upper display with the TARE key, press MODE to continue, ENTER to
save and exit. The higher the number the more readings are averaged and the slower the PT320BC will
respond to a rapid change. The weighting hopper may vibrate due to its resonant frequency and external
vibration. This may cause the indication to show an unstable reading. If the reading varies a lot, select a
higher filter value, otherwise select a lower value.
4.2.22 Digital filtering – second stage
While 2.d.F. is shown in the lower display enable or disable the second stage digital filter with “0” or “1”
shown in the upper display with the TARE key, press MODE to continue, ENTER to save and exit. “0”
disables the second stage filter, “1” enables the filter.
4.2.23 Digital filtering – second stage range
This setting will only show if the second stage digital filter is enabled. While d.F.r is shown in the lower
display select the desired digital filter setting from “1” to “99” shown in the upper display with the TARE key,
press MODE to continue, ENTER to save and exit. The second stage digital filter will be active when motion
detection is within the range set here, and inactive otherwise.
4.2.24 Start delay time
While Sdt is shown in the lower display select the desired start delay time from “0.0” to “9.9” shown in the
upper display with the TARE key, press MODE to continue, ENTER to save and exit. This is in seconds. It is
the time difference between the start input activation and actual batching process. When the discharge
gate is closed, it may cause the weighing hopper to vibrate. The “start delay time” is used to ensure that the
discharge gate is closed and the weighing hopper is stable before the start of the next batch.
4.2.25 Enable free fall compensation
While EFF is shown in the lower display select the desired number of batches for which free fall
compensation will be allowed, from “0” to “99” shown in the upper display with the TARE key, press MODE to
continue, ENTER to save and exit. 0 = no free fall compensation. 1~99, free fall compensation will be applied
every 1~99 sequences of batching. When free fall compensation is active, the amount of free fall
compensation is automatically calculated and applied to the fine feed, turning fine feed off at the appropriate
time.
Weight
Time
TTC
Start
Discharge
Fine
Free
Fall
Tolerance Check
Start
Coarse control
is deactivated
Weight
Time
CIT.C
Start
Fine control is
deactivated
Weight
Time
CIT.F
PT320BC instruction manual 17
4.2.26 Enable tolerance check
While Etc is shown in the lower display select the desired number of batches for which tolerance checking
will be allowed, from “0” to “99” shown in the upper display with the TARE key, press MODE to continue,
ENTER to save and exit. 0 = no tolerance checking. 1~99, tolerance checking will be applied every 1~99
sequences of batching.
4.2.27 BCD output rate (Option)
While Bcd.r is shown in the lower display select the desired BCD data output rate from “15/sec”, “50/sec”,
“100/sec” or “200/sec” shown in the upper display with the TARE key, press MODE to continue, ENTER to
save and exit.
4.2.28 Automatic tare enable
While AtE is shown in the lower display enable or disable automatic tare with “0” to “99” shown in the upper
display with the TARE key, press MODE to continue, ENTER to save and exit. If ATE = “0” the tare value set
for the first production run will be used for all batches until power down, ATE = “1”~”99” enables automatic
updating of the tare value every 1~99 batching sequences.
4.2.29 Entering the third function setting level
Press ZERO to enter the third level of function setting.
4.2.30 Automatic zero return
While Azr is shown in the lower display enable or disable automatic zero return with “0” or “1” shown in the
upper display with the TARE key, press MODE to continue, ENTER to save and exit. If AZR = “0” automatic
zero return is disabled, ATE = “1” enables automatic zero return.
4.2.31 Tare at start operation
While Sto is shown in the lower display enable or disable tare at start with “0” or “1” shown in the upper
display with the TARE key, press MODE to continue, ENTER to save and exit. If Sto = “0” tare is not carried
out at the first batch after power on, Sto = “1” tare is carried out at the first batch after power on.
The following table shows the relationship for ATE and STO.
STO=0, ATE=1 STO=0, ATE=2 STO=1, ATE=2
BATCH TARE BATCH TARE BATCH TARE
1st times No 1st times No 1st times Yes
2nd times Yes 2nd times No 2nd times No
3rd times Yes 3rd times Yes 3rd times Yes
4th times Yes 4th times No 4th times No
5th times Yes 5th times Yes 5th times Yes
6th times Yes 6th times No 6th times No
End of batch cycle.
Restart operation when
power is not turned off.
End of batch cycle.
Restart operation when
power is not turned off.
End of batch cycle. Restart
operation when power is
not turned off.
BATCH TARE BATCH TARE BATCH TARE
1st times Yes 1st times Yes 1st times Yes
2nd times Yes 2nd times No 2nd times No
3rd times Yes 3rd times Yes 3rd times Yes
STO=1, ATE=0
BATCH TARE
1st times Yes
2nd times No
3rd times No
If STO and ATE are equal to 0, then the tare weight is equal to 0 and the tare operation is not carried out.
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