MVR-300™ Refrigerant Gas Detector
P/N: 6203-9000 Version 1
15
Step
Description of Electrical Installation
4.
Observing proper polarity, connect normally closed (NC) common (COM), and normally open
(NO) wires for relays to the appropriate terminals.
Figure 9. Wiring Relay 1 (Low Gas Alarm) and Relay 2 (High Gas Alarm or Fault)
5.
Observing proper polarity, make the Modbus connections as follows, using the figures below
for reference.
Label
Description
Figure 10. Modbus Wiring Terminals
A
RS-485 “A” (non-inverted)
B
RS-485 “B” (inverted)
G
RS-485 shield
•
Prepare signal cable and put boot over the signal cable (
).
•
Add ferules if required (
).
•
Apply 10 cm piece of shrink wrap as close to the wire ends/ferules as possible while
leaving some free wire to allow connection to the detector (
).
•
Heat the shrink wrap (
).
•
Connect signal wires/ferules to the detector (
).
•
Slide rubber boot along the wire and shrink wrap assembly and connect it to the
detector (
).
Figure 11. Details for Connecting Modbus Communications Wiring
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