e-mail: [email protected]
For latest product manuals:
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DPS20 Series
Panel Meter for
Load cell signals
6-Digit,
1
⁄8 DIN Panel Mount
Shop online at
omega.com
User’s Guide
2
www.omega.com [email protected]
The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and
reserves the right to alter specications without notice.
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For Other Locations Visit omega.com/worldwide
3
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© Copyright 2018 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,
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WARRANTY/DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship
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4
DPS20
Load cell panel meter and controller
Instruction Manual
1. Panel meter DPS20
Panel meter for load cells, size 96x48mm (1/8 DIN)
-
-
-
-
-
(see secon 1.12.8)
-
•
(see sec-
on 1.11)
•(see secon 1.12.4)
•(see sec-
on 1.9.5)
• On Power Up
(see secon 1.12.14)
•(see
secon 1.12.5)
•(see secon 1.12.6)
•
(see
secon 1.12.13)
• Fast access 5
(see secon 1.12.13)
-
(see secon 1.8)
(see secon 1.8)
(see secon
1.8.1) (see secon
1.8.2)
(see secon 1.12.2)
(see secon 1.12.7)
1.111.12.4
1.1 How to use this manual
(see secon 1.12.6)
(see secon 1.12.5)
(see secon 1.9.1)
(see secon 1.12.8)
(see secon 1.12.10)
(see secon 1.12.11)
3(see secon 1.12.12)
5(see secon 1.12.13)
(see secon 1.12.14)
(see secon 1.12.17)
(see secon 1.12.18)
-
1.19
DPS20
Load cell panel meter and controller
Instruction Manual
4
4
6
6
6
6
7
7
7
7
9
9
(in) 9
9
3
22
22
1.2 Index
27
27
29
29
32
32
33
34
34
34
36
36
37
39
39
42
44
44
1.3 How to order
6
DPS20
Load cell panel meter and controller
Instruction Manual
(see secon 1.8)
(see secon 1.8)
(see Table 1).
1.9.5
1.4 Material included
Figure 1
(see
secon 2)
-
Figure 1 - Set of units label
1.5 Addional informaon
1.6 Front view
1.7 Rear view
Reading A B
Gross weight on o
Actual tare value o on
‘tare’ funcon acvated o fast ash
Net weight o o
Units (‘stock units’)
on on
Table 1 - Meaning for the front leds ‘A’ and ‘B’
(see secon 1.12)
(see secon 1.12.13)
7
DPS20
Load cell panel meter and controller
Instruction Manual
1.8 Signal and power connecons
Vexc+
Signal+
Signal-
Sense-
Vexc-
Sense+
EK
7
(short circuit to ‘Vexc-’)
6
5
4
3
2
1
Figure 2 - Signal connecons
-
sense +sense --
-
sense
-
sense +Vexc+
sense -Vexc-
-
sense
(see secon 1.16.4)
-
•
9
Figure 3 - Power connecons
Vexc+
Signal+ Signal-
Sense-
Vexc-
Sense+
EK
Figure 4 - Example for connecons with 1 load cell.
!
(see secon 1.8.1).
!
Fuse : to comply with the security regulaon 61010-
1, add to the power line a protecon fuse acng as
a disconnecon element, easily accessible to the op-
erator and idened as a protecon device.
• Power ‘H’ 250 mA me-lag fuse
• Power ‘L’ 400 mA me-lag fuse
1.16 -
DPS20
Load cell panel meter and controller
Instruction Manual
Digits
Reading
Load cells
1.15
*(values calculated for standard 350 Ohms load cells. For
cells with dierent impedance, the number is limited by the
140 mA available current)
Measure
(see secon 1.9.2)
(see secon 1.9.2)
Table 2
(and refresh for alarms, analog outputs and bus)
Table 2
Table 2
0 % to 99 % signal
Power
*(60 seconds)
Conguraon
Front protecon
Output and control opons
(see secon 2)
Mechanical
Temperature
Acquisions / sec. Display refresh Step response
Mode standard 16 acq. / sec. 16 refresh / sec. 63 mSec.
Mode 50 Hz 50 acq. / sec. 16 refresh / sec. 20 mSec.
Mode 60 Hz 60 acq. / sec. 16 refresh / sec. 17 mSec.
Table 2 - Technical data for the congured acquision mode
ModeModE 50.hZ
-
60.
hZ
1.12.7
1.9 Technical specicaons
9
DPS20
Load cell panel meter and controller
Instruction Manual
Signal
ranges
Accuracy Max. input
signal
0/100
mVdc 0.05% FS
30 V
0/30
mVdc 0.05% FS
0/20
mVdc 0.05% FS
0/15
mVdc 0.05% FS
0/10
mVdc 0.05% FS
0/5
mVdc 0.05% FS
Table 3 - Input signal ranges
-
Sensivity‘MV.V’Excita-
on voltage‘V.EXc’(see secon 1.12.2)
Example:with a sensivity conguraon of 2.0000 mV/V
and a congured excitaon voltage of 10 Vdc, the instru-
ment selects the 20 mV input signal range, by calculat-
ing 2 mV/V x 10 Vdc = 20 mV.
Table 3
-
-
-
1.12.13-
44
92
(in)
•
-
5(see secon 1.12.13).
(see secon 1.6)
1.9 Technical data (cont.)
96
(3.78 x 1.89 in)
(3.63 x 1.74 in)
(0.63in)
(2.95in) (0.31in)
DPS20
Load cell panel meter and controller
Instruction Manual
Included funcons Secon
Funcon tare yes 1.11
Auto-tare
automac zero tare
1.12.4
Maximum tare
to prevent undesired
tare acvaons
1.12.7
Scale factor
change the reading
scale
1.12.5
1.12.7
Stock of units
counts units instead of
weight
1.12.6
Modes
high rejecon to 50 Hz
and 60 Hz
1.9.1
Alarms
standard
stability alarms
double setpoint
acvaon delays
deacvaon delays
hysteresis
inverted relay
locked deacvaon
1.12.8
Display lters
xed digits
recursive
‘steps’
le zeros
1.12.10
Rear controls
acvate funcons from
rear terminal
1.12.11
Front key ‘LE’ (3)
acvate funcons from
key ‘LE’
(3)
1.12.12
Fast access (key ‘UP’ (5))
fast access to param-
eters from front key
‘UP’
(5)
1.12.13
On power up
acvate funcons at
power up
1.12.14
Memory
maximum and minimum
1.12.13
Password
blocks access to congu-
raon menu
1.12.17
Troubleshoong func
-
ons
values for input signal,
excitaon voltage and
excitaon current
1.9.3
1.12.13
Display brightness 5 levels 1.12.17
Table 4 - Funcons included
1.10 Included funcons 1.11 ‘Tare’ funcons included
-
Example : a truck enters a loading area and is placed on a
weighing system. The instrument indicates that the weight of
the truck is 2.500 Kg. A tare is applied to the instrument, and
now the reading is 0 Kg. The truck enters the loading area
and when it leaves, it is placed on the weighing system again.
Now the reading is 1.550 Kg. This is the weight of the mate
-
rial loaded on the truck. When the truck leaves the weighing
system the instrument reads -2.500 Kg. Acvate a tare again
to force a reading of 0 Kg or wait for a new truck.
•
(see secon 1.12.11).
•3
-
3(see
secon 1.12.12).
•
-
(see
secon 1.12.14).
•
(see secon 1.12.14).
Max.
Tare MAX.t
-
(see secon
1.12.7)
5(see
secon 1.12.15)
DPS20
Load cell panel meter and controller
Instruction Manual
Conguraon menu<
Fast access5
Conguraon menu
conguraon menu -
conguraon menu
<
PasswordPASScongu-
raon menu
errorcongu-
raon menu -
-
conguraon menu
congura-
on menu
1.13
‘Fast access’ menu
’
fast access
5
1.12.15
fast accessPassword
PASS -
fast access
-
Operang with the front keypad inside the menus
Key ‘SQ’<<-
conguraon menu
<ENTER
Key ‘UP’55fast ac-
cess5
-
Key ‘LE’3 3-
5-
1.12 Conguraon
-
5
‘
Rollback
’
conguraon menu
fast access
conguraon menu
<
<
InP
5
-
<
InP
3
3
Figure 5 - Example of operaon inside the ‘conguraon
menu’ (menu entries are given as example, and may not be the
exactly the same as the instrument menu entries).
DPS20
Load cell panel meter and controller
Instruction Manual
-
(see
Table 5)
Load cell
parameters
Default values
Sensivity 2
mV/V
Nominal weight 1000
Kilos
Excitaon voltage 10
Vdc
Table 5 - Parameters of the load cell
-
Theorecal conguraon of the load cell
Parameters
of the cellcELL
• Decimal pointdP
• Nominal weightLoAd
• SensivityMV.V
• Excitaon voltageV.EXc
-
(see secon 1.16.5)).
Example : load cell with 1.95 mV/V sensivity and a nominal
value of 5Kg and power 5 Vdc. To read in grams with a deci
-
mal point, congure the theorecal parameters as indicated
below :
Decimal point : XXXXX.X
Sensivity : 1.95 mV/V
Nominal weight : 5000.0
Excitaon voltage : 5 Vdc
-
system zero’
sys-
tem zero
Empirical conguraon of the load cell
-
•
Low
weight correconF.Lo<
-
<
Low weight correconF.Lo
•
High weight correcon
F.hI<
<
High weight correc
-
onF.hI
Assign the ‘system zero’
-
•
System zeroS.ZEr<
System zeroS.ZEr
-
Sensivity mV/V M V.V
-
-
password(see secon
1.12.17)
!
-
Scale factorScL.F
(see secon 1.12.7).
!
DPS20
Load cell panel meter and controller
Instruction Manual
< con-
guraon menu-
1.12.1
conguraon menu
1.13
Load cell param-
eters’cELL
Field correconF.cor
-
1.12.2
• Decimal pointdP
-
3-
Example : to read in ‘Kg’ with tenths of kilograms, place the
decimal point at ‘XXXXX.X’ and the reading will be always
be shown with 1 decimal.
Changing the posion of the decimal point will only light a
dierent decimal point led, but will not modify or re-scale
the measure of the instrument.
• Sensivity mV/VMV.V
• Nominal weightLoAd
-
Decimal pointdP-
Example : for a 5 Kg cell, congure a value of 5000 to read
in grams.
• Excitaon voltage V.Exc
(see secon 1.16.5).
Field correconF.cor
1.12.2
• Low weight correcon F.Lo
-
<
• High weight correconF.hI
<
System zeroS.ZEr
1.12.2
-
Load cell
parameters
Inial
conguraon
Deci
mal point
Sensivity
mV/V
Nominal weight
Excitaon
voltage
5 Vdc
10 Vdc
Field
correcon
High weight
correcon
Low weight
correcon
Low weight
value
High weight
value
System zero
Laboratory
mode
DPS20
Load cell panel meter and controller
Instruction Manual
•
•
-
•
-
Example : weighing system with reading from 0.0 to 2500.0
Kg. When weight is removed from the system, there is al
-
ways a variable remnant value : 2.2 Kg, 3.1 Kg, -0,7 Kg, ...
This remnant value is associated to the specic imperfecons
of each load cell. Also this remnant value takes some me to
stabilize, approximately 1 second. A manual tare can be ap-
plied each me the load cell is unloaded in order to correct
this error. The ‘auto-tare’ funcon will correct it automa-
cally without operator intervenon, conguring the follow-
ing parameters.
• acvaon value = 5.0
• stability = 1.0
• stability me = 2 seconds
When reading is lower than ‘5.0’, the ‘auto-tare’ system ac
-
vates, and it will analyze the stability of the signal. When
reading does not change more than ±1.0 counts for a me of
2 seconds, the tare will automacally acvate.
Maximum tare
‘MAX.t’
-
Maximum
tare‘MAX.t’
Scale factorScL.F
-
Example: a weighing system is congured to read in Kg, but
the system is going to be shipped to an area where measure
must be in pounds. The relaon between kilograms and
pounds is: 1 Kg = 2,20462 pounds. Within the scale factor,
congure the mulplier to 220462 and the divider to 100000.
The instrument is now congured to read in ‘pounds’.
Stock unitsStck
-
Stock units
-
5
Example from the conguraon menu : place 50 units on the
load cell, and check that the instrument is weighing correctly.
Enter the conguraon menu, and at the ‘Stock units’ (‘Stck’)
parameter, within the ‘Advanced conguraon’, introduce
‘50’ as the number of units. Save the value (key ‘SQ’ (<))
and leave the conguraon menu (key ‘LE’ (3) two mes).
The instrument restart and reads 50 units. Add more units
and observe that the reading increases proporonally to the
number of units.
Example from the front key ‘UP’ (5) : congure the func
-
on ‘Stock units’ to be accessible from the front key ‘UP’ (5)’
(fast access menu) (see secon 1.12.13) and leave the con
-
guraon menu. Place 50 units on the load cell, and check
that the instrument is weighing correctly. Access the param-
eter ‘Stock units’ through the front key ‘UP’ (5), and cong-
ure the number of units actually on the load cell (50 units).
Save the value (key ‘SQ’ (<)) and leave the fast access menu
(key ‘LE’ (3)). The instrument reads 50 units. Add more units
and observe that the reading increases proporonally to the
number of units
Stock unitsStck
-
-
Stock unitsStck
3(see secon
1.12.12)(see secon
1.12.11)
Stock unitsStck
DPS20
Load cell panel meter and controller
Instruction Manual
Auto-tareAut.t-
1.12.4
• Acvaon valueSEt
-
-
• Stability bandbAnd
• Stability me tIME
Maximum tare MAX.t
1.12.4
-
Scale factorScL.F
1.12.5
-
Stock unitsStck
1.12.6
-
ModeModE
1.9.1
StandardStd
Stability me
Auto-tare
Stability band
Acvaon value
Maximum tare
Advanced conf.
Scale factor
Divider
Mulplier
Standard
Mode
60 Hz
50 Hz
Stock units
Units
DPS20
Load cell panel meter and controller
Instruction Manual
(see secon
2) (see
secon 1.18)
• Congurable parameters
(see Figure 6).
• Acvaon and deacvaon delays
-
• Stability acvaon
(see Figure 7)
Applicaon : the lling of a tank with liquid is controlled with
a load cell. Upon reaching 5000 liters, the alarm 1 acvates to
stop the lling pump. Aer the pump has stopped, the liquid
is sll moving inside the tank, and this movement is reected
in weight and reading oscillaons. Alarm 2 is congured as
‘stability alarm’ and acvates when the liquid inside the tank
is at rest. At this moment, the tank can be removed safely.
• Second setpoint
(see Fig
-
ure 8)
• Inverted relay
• ‘Locked alarms’
3
t
setpoint
hysteresis
Alarm as maximum, no
hysteresis and no delays
acvaon
delay
deacvaon
delay
Alarm as maximum, with
hysteresis and delays
Alarm as minimum
,
no
hysteresis and no delays
t
t
t
Figure 6 - Examples of alarms with 1 setpoint
t
Set points 1 and 2
Alarm 2 as maximum with
stability.
t
Alarm 1 as maximum.
t
Figure 7 - Example of alarm with stability
t
Set point 2
Set point 1
Alarm as minimum, with
double setpoint, no hyster-
esis and no delays
t
Figure 8 - Example of alarm with double setpoint
DPS20
Load cell panel meter and controller
Instruction Manual
Alarm 1
Setpoint
Hysteresis
Acve
Type of alarm
Setpoint 2
Alarms
Acvaon
delay
Deacvaon
delay
Inverted relay
Locked alarm
Stability Stability band
Stability me
ALr1 ALr2
ALr31.12.8
•
AcveActon
•
Type of alarmTypEMAX
MIn
•
SetpointSEt
fast access
(see secon 1.12.13).
•
HysteresishySt-
-
-
•
Acvaon delaydEL.0
•
Deacvaon delaydEL.1-
• StabilityStbL
-
-
- Stability bandbAnd
- Stability me tIME
• Setpoint2
SEt2on
-
• Inverted relay r.Inv on
• Locked alarmA.Lck on
-
3 (see secon 1.12.12) (see secon
1.12.11).
DPS20
Load cell panel meter and controller
Instruction Manual
DisplaydISP
• Fixed digitsFIX.d
• Average lter AVr
•StepsStEP
Example: congure a step of 20 and the reading will change
in steps of 20 counts (‘1420’, ‘1440’, ‘1460’, ...).
•Le zeroLZEr
•Memory of maximumMAX
rSt
-
5(see secon 1.12.13).
•Memory of minimumMIn
rSt
-
5(see secon 1.12.13).
Le zeros
Steps
Average lter 0 to 100
Display Fixed digits Fix digits
Memory of
maximum
Memory of
minimum
DPS20
Load cell panel meter and controller
Instruction Manual
EK (see secon 1.8) -
EKVexc-
•TaretArE
• Alarm unlock A.LcK
(see sec
-
on 1.12.8).
•Stock unitsStck
(see secon 1.12.6)
-
3
3
• TaretArE
• Alarm unlock A.LcK
(see sec
-
on 1.12.8).
• Stock unitsStck
(see secon 1.12.6)
-
Rear controls
Tare
Alarm unlock
Stock units
Key LE Tare
Alarm unlock
Stock units
DPS20
Load cell panel meter and controller
Instruction Manual
fast access
5-
•5
-
•
5
1.12.6
•
5(see secon 1.9.5).
5
<
3
•
sense+sense-
On power upon.Pu
-
•
5
5
<
3
fast access
-
-
fast access
• Super fast access
fast access
5
-
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