RKI Instruments 65-2649RK-CH4-4 User Manual
Page 19

65-2649RK-CH4-4 M2A Transmitter Operator’s Manual
14
See Figure 7 below for field wiring connections to the M2A.
Figure 7: Wiring the M2A Junction Box to a Controller and Alarm Devices
16. Re-install the control PCB (and ribbon cable if necessary). Be sure the ribbon cable is
routed down below the control PCB so it will not be damaged by the cover when it is
screwed back on.
17. Secure the M2A junction box cover to the junction box.
18. Make controller, device, and relay connections as appropriate. If shielded cable is
used for the PWR/SIG connections, connect the cable shield’s drain wire to an
available chassis ground at the gas monitoring controller, recording device, or
programmable controller.
Fail
Alarm
Device
Alarm 1
Alarm
Device
Alarm Device
Power
(24 VDC) +
Typical Alarm
Wiring Shown
See
Modbus
Wiring
4 - 20 mA In (S)
(24 VDC) -
RKI Controller
Terminals
C
NC
N
O
AL
A
R
M
1
C
NC
N
O
AL
A
R
M
2
C
NC
N
O
FA
IL
Cable Shield
-
S
+
A
B
C
RS
485
PW
R
/S
IG
R
W
G
B
LE
L
See
Detector
Wiring
Alarm 2
Alarm
Device
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