CONTINUOUS-TRACE CIRCULAR-CHART RECORDER: RETROFIT INSTRUCTIONS
HA207305
Issue 3 Oct 08
HA207305
Issue 3 Oct 08
CONTINUOUS-TRACE CIRCULAR-CHART RECORDER: RETROFIT INSTRUCTIONS
Page 1
Upgrade/Retrofit instructions
Continuous-trace, circular-chart recorder
1 INTRODUCTION
This document is intended as an aid to those who are required to upgrade the recorder software, or who wish
to add or replace circuit boards.
1.1 CE COMPLIANCE
The hardware configuration of the recorder depends on whether it is certified as being CE compliant or not.
The easiest way of telling is to open the door of the recorder (figure 1.1a) and to look for the CE label, which
may be in one of two places according to recorder version. Figure 1.1b shows the CE mark located on the
outside of the right hand side wall of the platen, close to the serial number label, (which also includes (CE) as a
part of the serial number). Figure 1.1c shows the CE mark located near the top right-hand corner of the platen.
The three figures are not to the same scale as one another.
Figure 1.1a
Unlatching the recorder door
Figure 1.1b
CE Mark on platen wall
Figure 1.1c
CE Mark in platen top right
corner
1.2 SAFETY PRECAUTIONS
WARNING
Before opening the platen, isolate the recorder from all hazardous voltages, both supply and I/O
WARNING
If this procedure is being carried out with the recorder on a horizontal ‘bench’ or work top, it is recom-
mended that when the platen is open, a piece of masking tape or similar be used to secure the platen to
the door in order to prevent the platen from closing, inadvertently, onto the user’s hands. This precau-
tion is not necessary for recorders mounted on a vertical wall, panel or pipe.
Specification subject to change without notice. ©Eurotherm Limited.
EUROTHERM LIMITED
Faraday Close, Durrington, Worthing, West Sussex, BN13 3PL
Telephone: 01903 695888 Facsimile: 01903 695666
e-mail: [email protected]
Website: http://www.eurotherm.co.uk
HA207305/3 (CN24861)
E
UR
O
T
H
E
R
M
®
®
Tx-
Tx+
Rx-
Rx+
0V
5V
220
470
470
Rx-
Rx+
Tx-
Tx+
Recorder connector
Host computer
connector
RD203463
Comms V2.2
+ - + -+ - + -
240 V supply = 63 mA (slow blow)
120 V supply = 100 mA (slow blow)
FUSING
6 TRANSMITTER POWER SUPPLY AND SERIAL COMMUNICATIONS
The transmitter power supply (if fitted) is located on stand-off pillars, above the serial comms board (if fitted)
or directly to the recorder case. Once fitted, the connections to the main board (serial communications) or to
the supply voltage connector (transmitter power supply) must be made. See figures 4.2a, 4.3a or 4.4, as appro-
priate, for details.
6.1 TRANSMITTER POWER SUPPLY: OUTPUT POLARITY AND FUSING
Figure 6.1 shows the location and polarity of the four PSU outputs.
Figure 6.1 Transmitter power supply outputs
6.2 COMMUNICATIONS WIRING
Note: The serial communications board has not been approved for use in CE compliant equipment.
Figure 6.2, below shows the connector pinout. Refer to the communications manual for wiring recommenda-
tions, regarding biassing and termination.
Figure 6.2 Communications connector pinout
E
UR
O
T
H
E
R
M
®
®
CONTINUOUS-TRACE CIRCULAR-CHART RECORDER: RETROFIT INSTRUCTIONS
HA207305
Issue 3 Oct 08
HA207305
Issue 3 Oct 08
CONTINUOUS-TRACE CIRCULAR-CHART RECORDER: RETROFIT INSTRUCTIONS
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Figure 2.1a Platen release screw
Figure 2.1b Circuit board location (Current version)
RD203463
Comms V2.2
Serial
communications
board
Tx-
Tx+
Rx-
Rx+
0V
5V
C17/18
(C 27/28)
C12C34C56C78 + A - + B -
BA
C15/16
(C 25/26)
C13/14
(C 23/24)
C11/12
(C 21/22)
Rly 1(5)Rly 2(6)Rly 3 (7) Rly 4 (8)
NC Com No
NC Com No NC Com No NC Com No NC Com No
Option board 1
Board 1 provides input channels 1 and 2.
Board 2 provides input channels 3 and 4
Option boards
If fitted, boards 2 and
3 are mounted above
board 1 (on standoffs)
Transmitter Power Supply
If fitted, mounted above
comms board (on standoffs)
230V
L
L2/N
Super Cap
Transmitter Power
supply connector
L
Supply
fuse
L
L2/N
NLNEE
Supply and
Case Heater
connectors
Board 1 provides input channels 1 and 2.
Board 2 provides input channels 3 and 4
Input boards
If fitted, board 2 is
mounted above board
1 (on standoffs)
+-
1 231 23
Board 1/
Board 2 links
JP7
CJC RTD
JP7/ JP8
for Ch2(4)
Ch 1(3)
Input
Down Up
RTD TC
JP1
JP5
JP6
Ch 2(4)
Input
Down Up
RTD TC
JP8
JP1 for both
channels.
JP5/ JP6
for Ch1(3)
JP2
JP3
JP4
+-
Main Board
2 CIRCUIT BOARD LOCATION
Keypad
connector
Pen lift switch
Channel 1
Channel 2Channel 4
Chart drive
motor
Main board connector
Channel 3
A
AA
A
Top
These keys present only if loop controller fitted
5 FITTING CONTROL LOOPS
This may require the fitting of a retransmission or relay output board (described in section 4, above), an update
to the software (section 3) and, if this is the first time loops have been fitted to this recorder (i.e. there are no
operator keys to the left of the display), the replacement of the display keyboard. This section describes the
replacement of the keyboard. Figure 5a, shows the display keyboard for recorders fitted with control loops.
Figure 5b, is a view on the rear of the display board (accessible from the rear of the platen) showing all the
relevant connectors.
Figure 5a Control loop keyboard
Figure 5b Display board connector locations
5.1 KEYBOARD/DISPLAY BOARD REPLACEMENT PROCEDURE
1. Disconnect all the connectors in the following order:
Main board ribbon cable (note 3).
Channel 1, channel 2, channel 3, channel 4
Chart drive
Pen lift
Keyboard
2. Taking care to retain the associated washers, remove the four screws ‘A’ which secure the display board.
Remove the display board and store it in a static safe area.
3. Carefully remove the keypad from the front face of the platen, and remove any remaining adhesive from
the keypad mounting area of the platen, by gentle rubbing.
Caution
It is recommended that solvents are
n o t used as they may make the adhesive ‘stickier’ and thus more
difficult to remove, and/or, irreversible damage will be caused to the platen material.
4. Remove the protective backing material from the new control keypad, and after ensuring that it is oriented
correctly, press the keypad onto the platen, in the same place as the old keyboard was previously located.
5. After ensuring correct orientation, re-fit the display board, using the screws and washers previously re-
moved.
6. Reconnect all the connectors in the reverse order to the disconnection order given in step 1.
Notes:
1. When viewed from the rear of the platen, the channel pen drives are counted from 1 to 4 in a left-
right direction. (E.G. Channel one is left-most and channel four (if fitted) is right-most).
2. See the Controller and setpoint generator manual for details of loop control operations.
3. For recorders manufactured before May 2008: if the display board is being replaced, then the exist-
ing ribbon cable should also be replaced with the new version (DN204384) supplied with the board.
CAUTION
All circuit boards contain components which are sensitive to static electrical discharge. All relevant per-
sonnel must be aware of proper static handling procedures.
2.1 INTRODUCTION
Figure 2.1a shows the platen securing screw location. When this, captive, screw is undone, the platen can be
opened to reveal the circuit boards (figure 2.1b). Figures 2.1a and b are not to the same scale.
CONTINUOUS-TRACE CIRCULAR-CHART RECORDER: RETROFIT INSTRUCTIONS
HA207305
Issue 3 Oct 08
HA207305
Issue 3 Oct 08
CONTINUOUS-TRACE CIRCULAR-CHART RECORDER: RETROFIT INSTRUCTIONS
Page 3Page 14
230V
L
L2/N
Super Cap
Transmitter Power
supply connector
L
Supply
fuse
L
L2/N
NLNEE
Supply and
Case Heater
connectors
U4
U17
Relay board
connector
Input board
connector
Operator interface
connector
Serial comms board
connector
Retransmission/
Contact input connector
Option board connector
(For non-CE boards only)
(For CE compliant boards only)
(For all input
board types)
230V
L
L2/N
Super Cap
Supply
connection
L
Supply
fuse
R D 2 0 3 4 6 4
3 9 2 M a i n V 5 . 0
Main EEPROM (U17)
U4
(U3)
Transmitter Power
supply connector
Relay board
connector
I/O board
connector
Operator interface
connector
Serial comms board
connector
Retransmission/
Contact input connector
3 PROM/EEPROM FITTING/REPLACEMENT
3.1 PROM LOCATIONS
There are three versions of the main board, which , for the purposes of his document, will be called ‘Original’,
'Intermediate' and ‘Current’. CE compliant recorders are fitted with the intermediate or current design. Non-
compliant recorders may be found with any version. In all cases, the EEPROM location names are the same, but
they are in different positions on the board, or are of a different physical shape. Figures 3.1a to 3.1c show the
three versions of the main board.
Figure 3.1a Main board PROM locations (Current version)
Figure 3.1b Main board PROM locations (Intermediate version)
C17/18
(C27/28)
Board 1 provides contact inputs C11 to C18.
Board 2 provides contact inputs C21 to C28.
Board 1 provides retransmission outputs 1
and 2
Board 2 provides retransmission outputs 3
and 4
Fit links here for Board 1
Board 1
Link
Side view of link
C12C34C56C78 + A - + B -
BA
Link for Voltage output
'Park' for mA output
C15/16
(C25/26)
C13/14
(C23/24)
C11/12
(C21/22)
Contact (event) inputs Retransmission
outputs
Contact inputs
O/P A O/P B
Negative contacts
common.
Retransmission
outputs
C
All 'C' terminals
common
Fit links here for Board 2
Board 2
4.7 RETRANSMISSION/CONTACT INPUT BOARD
Note: This retransmission / contact input board, is occasionally referred-to in this document as the ‘Re-
transmission board’ for brevity. The expressions ‘Contact input’ and ‘Event input’ are used interchange-
ably in this and in other documents.
Up to two retransmission boards may be fitted. Each board may contain eight contact input circuits and one
or two retransmission outputs, or it may contain only one or two retransmission outputs, or only eight contact
inputs according to the variant purchased.
There are two versions of this board, known as 'CE compliant' and 'Original'. Both versions can contain any of
the variants described in the previous paragraph. Figure 4.7.2 shows the pinout and link arrangements for the
original version. The pinout and Voltage/mA setting links for the CE compliant version are the same as those for
the original version, but the board number setting links are not fitted.
Note Outputs can be set to either 0 to 20mA (0 to 5V) or 4 to 20 mA (1 to 5V) in software configura-
tion (see Installation and Operation manual)
4.7.1 CE compliant boards
This version of board is compatible with the intermediate and current main board design. Each circuit board has
two links to define whether the retransmission output is to be Voltage or Current. The relevant positions for
these links is shown in figure 4.7.2 below, which also shows the pinout.
The board with the solid ribbon cable connection is defined as board 1; the board with the split ribbon cable
connection is defined as board 2.
4.7.2 Original design boards
In addition to the Voltage/current links described in 4.7.1, above, the original Retransmission board (not com-
patible with the intermediate version of the main board) has three links used to define the board as board 1 or
board 2. Figure 4.7.2 shows the location of all the links, and also the pinout, which applies to both versions of
the board.
Figure 4.7.2 Retransmission board pinouts and link locations
CONTINUOUS-TRACE CIRCULAR-CHART RECORDER: RETROFIT INSTRUCTIONS
HA207305
Issue 3 Oct 08
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Issue 3 Oct 08
CONTINUOUS-TRACE CIRCULAR-CHART RECORDER: RETROFIT INSTRUCTIONS
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230V
L
L2/N
RD203464
392Main V5.0
Super Cap
Supply
connection
Transmitter Power
supply connector
L
Supply
fuse
Main EEPROM (U17)
U4
(U3)
Option board connectorI/O board connector
Operator interface
connector
Serial comms board
connector
3.1 PROM LOCATIONS (Cont.)
Figure 3.1c Main board PROM locations (Original version)
3.2 SOFTWARE UPGRADE AND FEATURE ADDITION
The following procedures must be carried out only after the recorder has been isolated from all sources of haz-
ardous voltage (both supply and I/O).
3.2.1 Main EEPROM replacement
1. Make a note of the orientation of the IC.
2. Taking the appropriate precautions against static electrical discharge, carefully prise the Main EEPROM (U17)
out of its socket.
3. Fit the replacement integrated circuit, ensuring that it is oriented correctly. Orientation is shown in figures
3.1a to 3.1c above.
4.6 RELAY OUTPUT BOARD HARDWARE CONFIGURATION
A maximum of two relay output boards may be fitted, each board containing up to four relays. Board 1 (usually
the bottom board) contains relays one to four, and board 2 (mounted above board 1, on stand-off pillars) con-
tains relays five to eight. Relay numbering is left-to-right. If board 1 contains, say, only two relays, the first relay
on board 2 is still called ‘Relay 5’ (not ‘Relay 3’)
There are two versions of the relay output board, known as 'CE compliant' and 'Original'. Figure 4.6.2 shows the
pinout and link location for the original design. The pinout for CE compliant boards is the same, but the link is
not fitted.
4.6.1 CE compliant boards
This version of relay output board is compatible with the intermediate and current main board design and has
no hardware configuration associated with it.
The board with the 'solid' ribbon cable connection is defined as board 1; the board with the split ribbon cable
connection is defined as board 2.
4.6.2 Original design boards
The original Relay output board (not compatible with the intermediate version of the main board) has a link to
set the board as board 1 or board 2.
Figure 4.6.2 shows the location of the link, and the relay pinout.
Fit link here for Board 2
Fit link here for Board 1
Link
Board 1
Board 2
Link
Side view of link
com
nc
no
NC NO
COM
Relay internal wiring
(Relay in alarm)
1 (5) 2 (6) 3 (7) 4 (8)
Board 1 provides relays 1 to 4
Board 2 provides relays 5 to 8
When present, board 2 is fitted above board 1
NC COM NO NC COM NO NC COM NO NC COM NO
Figure 4.6.2 Relay board pinout and link location
CONTINUOUS-TRACE CIRCULAR-CHART RECORDER: RETROFIT INSTRUCTIONS
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Issue 3 Oct 08
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3.2.1 Feature addition
Addition of features may be purely a software upgrade, or it may involve both the adding of an option board,
and a software feature upgrade. The following instructions describe the software feature upgrade procedure.
The fitting of circuit boards is described in section 4 of his document.
Caution
If fitting more than one retransmission/contact input option board, or more than one relay output
board, board one upgrade must always be done first. If the board two upgrade is performed first, then
when the board one upgrade is performed, it will delete board two features.
1. If there is an integrated circuit (IC) in U4 position (figures 3.1a to 3.1 c), carefully remove it and place it in a
static safe medium, ready for re-use after software upgrade is complete (step 5).
2. After taking into account the caution above (if relevant), insert the 8-pin Integrated Circuit into the U4
socket, ensuring that it is oriented correctly (figure 3.1a to 3.1c)
3. Turn power on.
4. If there are further upgrades to be made, switch power off, replace the IC in U4 with the next one, and re-
apply power to the recorder. Repeat for all upgrades.
5. When all upgrades are complete, and if there was an original IC in U4 position, switch the recorder power
off, and replace the last-fitted IC with the original IC (removed at step 1).
6. If there was no integrated circuit originally fitted, then the final IC may be left in U4 position.
4 CIRCUIT BOARDS
4.1 INTRODUCTION
The recorder can have the following boards fitted within the case:
1. Main board
2 Up to two input boards.
3 Up to three option boards
4 Serial communications board (not approved for use in CE compliant equipment)
5 Transmitter Power supply board.
The addition of control loops is discussed in section 5
4.1.1 Circuit board fitting
The fitting of circuit boards is generally a matter of fitting any required standoff pillars in the appropriate places,
using the fixings supplied, and connecting the ribbon cable from the main board to the newly-fitted board.
The input board needs also to be connected to safety earth (in order to maintain CE compliance). This connec-
tion is made at a two-way terminal block located either on the input board (current version boards only) or on
the filter board (original version).
The transmitter power supply needs a supply voltage connection instead of a ribbon cable.
4.5.4 Upscale/Downscale drive
These links define the behaviour of the channel in the case of a broken thermocouple input circuit. Locating
the link to ‘Upscale’ means that if the recorder detects an open circuit, the channel will drive to the full scale
position and remain there until the problem is solved. Locating the link to ‘Downscale’ is similar, but the re-
corder drives the trace to chart zero instead of full scale.
Note
If the associated TC/RTD link is set to RTD, the upscale/downscale link must be removed. It is recom-
mended that, for safekeeping, the link be ‘parked’ sideways on the centre pin of the connector.
CONTINUOUS-TRACE CIRCULAR-CHART RECORDER: RETROFIT INSTRUCTIONS
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Issue 3 Oct 08
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CONTINUOUS-TRACE CIRCULAR-CHART RECORDER: RETROFIT INSTRUCTIONS
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+-
123123
Shunt/attenuator
board (if fitted)
Board 1/
Board 2 links
JP2
JP3
JP4
JP1
JP6 JP8 JP7
JP5
CJC
RTD
Up
Down
RTD
T/C
Up
Down
RTD
T/C
JP7/JP8
for Ch2(4)
JP1
for both
channels
JP5/JP6
for Ch1(3)
Link top pins for board 1
Link bottom pins for board 2
Filter board
Safety Earth
connection
4.5.1 Board number
This is set by three links near the top end of the circuit board. Board 1 (channels 1 and 2) is the lower of the
two cards with Board 2 (channels 3 and 4) (If fitted) set above Board 1 on insulating standoffs.
4.5.2 CJC/RTD
This link must be set to RTD if channel 1 (3) is to be used for RTD input or to CJC for any other input type. This
link must be used in a way appropriate to the TC/RTD links described below.
Notes:
1 If the link is set to RTD neither channel can be used for thermocouple inputs.
2 If the link is set to CJC, channel 2 (4) may be used for RTD or T/C etc. inputs, but channel 1 (3) can-
not be used for RTD measurements.
4.5.3 TC/RTD
This link must be set for each channel. Channels with this link set to RTD can be used only for RTD inputs.
Channels with this link set to TC, are suitable for all other input types. The setting of the CJC/RT (above) link
must be appropriate to the setting of this TC/RTD link.
Figure 4.5b Input board (previous versions) link
locations
4.2 CURRENT MAIN BOARD
The general arrangement of boards is shown in figure 4.2a, below. The figure also shows the ribbon cable ar-
rangement between the main board, and the current versions of input and option board. This version of the
main board is backwards compatible with original version I/O boards, using a different connector (J10a) for the
option boards.
The physical arrangement of I/O boards is shown in figures 4.2b and 4.2c. When fitted, the Transmitter power
supply board is fitted above the Serial communications board, on standoff pillars similar to those depicted in
figures 4.2b and 4.2c.
Notes:
1. Relay output and retransmission/contact input boards are defined as board 1 or board 2 by ribbon
cable connection. It is therefore essential to make these connections correctly. It is recommended
that where there is a mix of option board types, then relay boards are fitted first, with retransmis-
sion/contact input boards fitted above.
2. Input boards are separated by insulating standoff pillars, not metal ones as are used elsewhere.
Figure 4.2a General arrangement of circuit boards - current main board, current I/O boards
L
L2/N
L
L
L2/N
NLNEE
RD2 0346 3
Com ms V2.2
Tx-
Tx+
Rx-
Rx+
0V
5V
Serial
communications
board
Transmitter Power Supply
If fitted, mounted above
comms board (on standoffs)
LN
Main board
(Current version)
JP2
JP3
JP4
+-
123123
JP7
CJC RTD
Ch 1 Input
Down Up
RTD TC
JP1
JP5
JP6
Down Up
RTD TC
JP8
+-
Input boards
If fitted, board 2 is
mounted above board 1
(on standoffs)
Input boards
If fitted, board 2 is
mounted above board 1
(on standoffs)
BA
Option board 1
Board 1 provides input channels 1 and 2.
Board 2 provides input channels 3 and 4
Option boards
If fitted, boards 2 and 3
are mounted above
board 1 (on standoffs)
Cable for
retrans board 1
Cable for
ip board 1
Cable for retrans
board 2
Cable for relay
board 1
Cable for relay
board 2
See Notes
Cable for input
board 2
Notes
1. Option board cables:
A maximum of three option boards may be fit-
ted. If three boards are fitted they can be
either two relay boards and one
retransmission/ contact input board OR one
relay board and two retransmission/ contact
input boards.
2. For illustrative purposes this figure shows
ribbon cable connections for both a relay
board and a retransmission board as the top
board. Clearly, in reality, only one such con-
nector could be fitted, the other (unused) rib-
bon cable length being left unconnected.
3. Use connector J10a for original version
option boards.
J10a
+-
123123
JP7
CJC RTD
Down Up
RTD TC
JP1
JP5
JP6
Down Up
RTD TC
JP8
+-
Ch 2 Input
Ch 3 Input Ch 4 Input
Ground connection to input boards
must be made, for CE compliance.
JP2
JP3
JP4
+-
123123
Shunt/attenuator
board (if fitted)
Board 1/
Board 2 links
Link right pin pairs for board 1
Link left pin pairs for board 2
JP7
CJC RTD
JP7/JP8
for Ch2(4)
Ch 1(3)
Input
Down Up
RTD TC
JP1
JP5
JP6
Ch 2(4)
Input
Down Up
RTD TC
JP8
JP1 for both
channels.
JP5/JP6
for Ch1(3)
JP2
JP3
JP4
Safety earth
connection
Figure 4.5a Input board (current version) link locations
4.5 INPUT BOARD HARDWARE CONFIGURATION
The input board comes in two versions, the 'Original' and the 'Current'. For some recorders, the Original ver-
sion was fitted with a filter board, as shown in figure 4.5b, below. The current version (figure 4.5a) does not
require this filter board.
CONTINUOUS-TRACE CIRCULAR-CHART RECORDER: RETROFIT INSTRUCTIONS
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CONTINUOUS-TRACE CIRCULAR-CHART RECORDER: RETROFIT INSTRUCTIONS
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4.2 CURRENT MAIN BOARD (Cont.)
Figure 4.2b Side view of current version input boards
Figure 4.2c Side view of Option boards.
'Wavy' washer
under screw heads
I/O board 1
I/O board 2
Ribbon cable
connection to
main board
To safety earth
connection
Input signal
wiring
Filter board
Filter board
Input signal
wiring
Shunt/attenuator
board
Option board 3
'Wavy' washer
under all screw
heads
Option board 1
Option board 2
Ribbon cable
connection to
main board
L
L2/N
L
RD2 0346 3
Com ms V2.2
Tx-
Tx+
Rx-
Rx+
0V
5V
Serial
communications
board
Transmitter Power Supply
If fitted, mounted above
comms board (on standoffs)
JP2
+-
123123
JP3
JP4
JP1
JP6JP8 JP7
JP5
CJC
RTD
Up
Down
RTD
T/C
Up
Down
RTD
T/C
Ch 1
Input
Ch 2
Input
Board 1 provides input channels 1 and 2.
Board 2 provides input channels 3 and 4
+-
Input boards
If fitted, board 2 is
mounted above board 1
(on standoffs)
+-
123123
JP2
JP3
JP4
JP1
JP6JP8 JP7
JP5
CJC
RTD
Up
Down
RTD
T/C
Up
Down
RTD
T/C
Ch 3
Input
Ch 4
Input
+-
Input boards
If fitted, board 2 is
mounted above board 1
(on standoffs)
BA
Option board 1
Board 1 provides input channels 1 and 2.
Board 2 provides input channels 3 and 4
Option boards
If fitted, boards 2 and 3
are mounted above
board 1 (on standoffs)
Main board
(Original design)
Ground connection to input boards
must be made, for CE compliance.
4.4 ORIGINAL MAIN BOARD
As far as the user is concerned, the major difference between the original control board and later versions
is that the ribbon cabling to the option boards is different, and that, with the original design, all the option
boards have circuit board links to define whether they are ‘board 1’ or ‘board 2’. With other versions, only
the input boards need to be defined in this way. Board links are discussed in sections 4.5 to 4.7, below. The
original version main board is replaceable by the current version main board, using connector J10A for the op-
tion boards.
Input boards may or may not be fitted with filter boards (as shown), according to input board version.
Figure 4.4 General arrangement of circuit boards - original version boards
CONTINUOUS-TRACE CIRCULAR-CHART RECORDER: RETROFIT INSTRUCTIONS
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RD2 0346 3
Com ms V2.2
Tx-
Tx+
Rx-
Rx+
0V
5V
Serial
communications
board
Transmitter Power Supply
If fitted, mounted above
comms board (on standoffs)
LN
L
L2/N
L
Main board
(Intermediate version)
JP2
+-
123123
JP3
JP4
JP1
JP6JP8 JP7
JP5
CJC
RTD
Up
Down
RTD
T/C
Up
Down
RTD
T/C
Ch 1
Input
Ch 2
Input
Board 1 provides input channels 1 and 2.
Board 2 provides input channels 3 and 4
+-
Input boards
If fitted, board 2 is
mounted above board 1
(on standoffs)
+-
123123
JP2
JP3
JP4
JP1
JP6JP8 JP7
JP5
CJC
RTD
Up
Down
RTD
T/C
Up
Down
RTD
T/C
Ch 3
Input
Ch 4
Input
+-
Input boards
If fitted, board 2 is
mounted above board 1
(on standoffs)
BA
Option board 1
Board 1 provides input channels 1 and 2.
Board 2 provides input channels 3 and 4
Option boards
If fitted, boards 2 and 3
are mounted above
board 1 (on standoffs)
Cable for
retrans board 1
Cable for
ip board 1
Cable for retrans
board 2
Cable for relay
board 1
Cable for relay
board 2
See Note
Cable for input
board 2
Notes
1. Option board cables:
A maximum of three option boards may be fit-
ted. If three boards are fitted they can be
either two relay boards and one
retransmission/ contact input board OR one
relay board and two retransmission/ contact
input boards.
2. For illustrative purposes this figure shows
ribbon cable connections for both a relay
board and a retransmission board as the top
board. Clearly, in reality, only one such con-
nector could be fitted, the other (unused) rib-
bon cable length being left unconnected.
Ground connection to input boards
must be made, for CE compliance.
'Wavy' washer
under screw heads
I/O board 1
I/O board 2
Ribbon cable
connection to
main board
To safety earth
connection
Input signal
wiring
Filter board
Filter board
Input signal
wiring
Shunt/attenuator
board
Option board 3
'Wavy' washer
under all screw
heads
Option board 1
Option board 2
Ribbon cable
connection to
main board
4.3 INTERMEDIATE MAIN BOARD
The general arrangement of boards is shown in figure 4.3a below, which also shows the ribbon cable arrange-
ment for this version of the main board. The I/O board and option board arrangement is depicted in figures
4.3b and 4.3c. When fitted, the transmitter power supply is mounted above the serial communications board on
standoffs similar to those shown in figures 4.3b and 4.3c.
Notes:
1. With the intermediate main board, the Relay output and the retransmission/contact input boards are
defined as ‘Board 1’ or ‘Board 2’ by the ribbon cable connection. It is therefore essential to make
this connection in the correct way. It is recommended that if there is a mix of option boards, any
relay board(s) are fitted first, with any retransmission board(s) fitted above.
2. Input boards are separated by plastic standoffs, not metal ones as are used elsewhere.
3. The input board requires a ‘filter board’ to be fitted to its input terminals (figure 4.3b) for CE com-
pliance.
Figure 4.3a General arrangement of circuit boards - intermediate main board
4.3 INTERMEDIATE MAN BOARD (Cont.)
Figure 4.3b Side view of input boards (original version, with filter board)
Figure 4.3c Side view of option boards
-
1
-
2
-
3
-
4
-
5
-
6
-
7
-
8
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