RKI Instruments M2A - Manual (Page 28)

23 M2A Transmitter Operator’s Manual
See Figure 26 below for field wiring connections to the M2A.
Figure 26: Wiring the M2A to a Controller and Alarm Devices
8. 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.
9. Secure the junction box cover to the junction box.
10. 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.
Start Up
Introducing Incoming Power
1. Complete the installation procedures described earlier in this manual.
2. Verify that all wiring connections are correct and secure.
3. Turn on the incoming power.
4. If necessary, turn on the controller or other monitoring device that is connected to the M2A.
5. The OLED display will indicate the firmware version when the M2A is first powered up and
will then count down a one minute warm-up period before normal operation begins. During
normal operation, the display will indicate the target gas and current gas reading. Verify that
the display is indicating the target gas and current gas reading after the warm-up period is
complete and normal operation begins.
Alarm Device
Power
Fail Alarm
Device
Alarm 1
Alarm Device
Typical Alarm
Wiring Shown
See
Modbus
Wiring
RKI Controller
Terminals
(24 VDC) +
4 - 20 mA In (S)
(24 VDC) -
-
S
+
A
B
C
R
S
485
PW
R
/SI
G
R
W
G
B
LE
L
See
Detector
Wiring
C
NC
N
O
AL
AR
M
1
C
N
C
N
O
AL
AR
M
2
C
N
C
N
O
FA
IL
Alarm 2
Alarm Device
METHANE
0 %LEL