Detcon 700 Remote Sensor/Alarm Relay Module - Manual (Page 7)

700 RAM I.M.
junction box via two machine screws allowing the RAM display and RAM connector board to unseat from
the 12-pin plug-in connector and provide access to the terminal board connectors (Figure 5). To install the
electronics package, properly align the 12-pin plug-in connector and gently push the RAM in until it is fully
seated to the terminal board. The RAM faceplate will be even with the top of the junction box when installed
properly. The RAM top should be flush with the top of the enclosure before screwing down the junction box
cover.
The RAM display and
RAM connector board
External Wiring
12-Pin Plug-In
Connector
Input Port
The terminal
board sets on
the stand-offs in
the enclosure
Provide at least
a 6" Service
Loop for all
wiring
6"
Input Port
Note: Retaining Guard
removed for clarity
RAM faceplate
Explosion Proof Junction Box
Figure 4 Exploded View of Assembly
1.3 Field Wiring
The field wiring connections are made to the bottom PCA (terminal board) of the RAM using a series of
connector blocks. There is a 6-pin terminal block for connection to the 700 Gas Sensor (labeled SENSOR), a
9-pin terminal block for connection to the 3 relay contacts (labeled RELAY OUTPUT), a 6-pin terminal
block for connection of power, mA output and Modbus™ interface to the host device (labeled IN) and a 6-
pin terminal block for connection of power and Modbus™ interface to an additional device (labeled OUT).
700 Sensor
Connections
ALM1 ALM2 FLT
NO NC COM NO NC COM NO NC COM
J7
J2
J1
J4
IN
SENSOR
OUT
+
+ mA A B
mA
A
B +
A
B
K1
K3
K2
Input Power and
mA Output
Alarm Relay
Connections
Output
Power
Modbus ™
Interface to Host
Modbus ™
Interface
U1
Figure 5 Interface connections on terminal board
The user will typically connect the 700 Gas Sensor directly to the RAM if there is no requirement for remote
sensor separation (Figure 6). In this case, the 700 sensor will not require its own junction box and it is not
700 RAM I.M. Rev. 1.0 Page 3 of 13