M2A Transmitter Operator’s Manual 19
Figure 10: Terminal PCB Component Location
Power/Signal Terminal Strip
The power/signal terminal strip is a three position plug-in style terminal strip located at the top of the left
terminal column. It is used to connect 24 VDC power to the M2A and to connect the 4 - 20 mA output signal to a
device.
The signal output, the S terminal, does not have to be connected for the M2A to function. The S terminal is used
if you want to connect the 4 - 20 mA output signal to another device such as a gas monitoring controller, chart
recorder, or programmable controller (PLC).
Detector Terminal Strip
The detector terminal strip is a four position plug-in style terminal strip and is the middle terminal strip in the left
terminal column. For a combustible or CO
2
M2A, all four terminals are used to connect the detector to the M2A.
For a toxic or oxygen M2A, only two of the terminals are used for connecting a detector; two terminals are
dedicated for connecting a toxic detector and two are dedicated for connecting an oxygen detector (only one
detector can be installed).
Figure 11: Detector Terminal Strip
- S +
A B C
RS 485 PWR/SIG
R W G B
LEL
C NC NO
ALARM 1
C NC NO
ALARM 2
C NC NO
FAIL
Modbus Terminal Strip
Ground Jumper
Programming Connector
(Factory Use)
Power/Signal Terminal Strip
Termination Jumper
Ribbon Cable Connector
Detector Current Adjust Pot
(Comb/CO2 Type Only, Factory Adjust)
Detector Terminal Strip
(Comb/CO2 Version Shown)
Relay
Terminal
Strips
Toxic/Oxy
Detector
Terminal
Strip
Comb/CO2
Detector
Terminal
Strip
- S +
PWR/SIG
TOXIC OXY
+ - + -
RS 485
A B C
C NC NO
ALARM 1
C NC NO
ALARM 2
C NC NO
FAIL
- S +
A B C
RS 485 PWR/SIG
R W G B
LEL
C NC NO
ALARM 1
C NC NO
ALARM 2
C NC NO
FAIL
w ww. . com
information@itm.com1.800.561.8187
To Next Page
Loading...
