Critical Environment Technologies GEM-II, Руководство по эксплуатации

Страница: 29 / 60

© 2014 All rights reserved. Data subject to change without notice. 29
Rev. E | 2014.10 GEM-II - Operation Manual
6.6 Important notes for Wiring
GEM is a low voltage powered gas detector. If providing VAC power, use terminals 12 & 13. If
providing VDC power, use terminals 12 & 13 and observe polarity. Reference Section
6.5 Wiring
Connections .
Fan / alarm control wiring is terminated at terminals 1 to 6. The relays are designed to switch fan
“starters” not the fans directly. The relay contacts are rated 5 amps @ 240 VAC each, S.P.D.T.
An analog output of 4 - 20 mA is available for one or two sensors. Channel 1 sensor analog
outputs are achieved by wiring to terminals 7 & 8 and observe polarity. Channel 2 sensor analog
outputs are achieved by wiring to terminals 10 & 11.
Specific GEM types will also act as controllers to which remote transmitters can be connected.
GEM Type “B” and type “D” will accommodate one remote sensor or analog transmitter. To
connect one remote sensor or analog transmitter to a GEM, use terminals 9, 10 & 11 and observe
polarity.
6.7 system Installation
There are two exterior mounting brackets, one top and one bottom of the base of the enclosure.
Alternatively, remove the slot / Robertson head screw securing the hinged door. There are four
only 3/16” diameter corner mounting holes located inside the system enclosure base. Secure the
system to any flat surface.
6.7.1 Low Voltage Power
Drill out one or more of the PVC conduit entry hole plugs located at bottom left or right or
top left edge of system enclosure base. Reference Section
6.3 Standard Enclosure Mounting
Component s.
If supplying VAC operational power, pull two wires suitable for low voltage from power source to
the terminals 13 & 14 for Full Wave operation.
If supplying VDC or VAC, wire to terminals 12 & 13. J2 Removed. Factory default.
NOTE
: Maximum distance between the GEM and a remote sensor should not exceed 500 ft.