Critical Environment Technologies GEM-II, Руководство по эксплуатации

Страница: 30 / 60

30 © 2014 All rights reserved. Data subject to change without notice.
GEM-II - Operation Manual Rev. E | 2014.10
6.7.2 Wiring to Remote Sensor
Three-conductor, 16 - 18 gauge, stranded wire is required between the control panel and the
remote solid-state sensor (reference Section
6.8 Installation Examples, Type D with Onboard &
Remote Sensors and Type E with Two Onboard Sensors ). Under most local electrical codes, low
voltage wires cannot not be run within the same conduit as line voltage wires. 3-conductor, 16
- 18 gauge wire / cable must be shielded when connecting to a remote analog transmitter. The
LPT-A or LPT series remote analog transmitter enclosures have several conduit entry locations
(general purpose enclosure).
NOTE
: DO NOT use solid-core wire for connection to wiring terminal strip. Any damage caused by
using solid-core wire will void warranty. Use stranded wire within conduit ONLY.
6.7.3 Voltage to Remote Sensors
The voltage supplied by the controller to remote solid state sensors should measure
approximately 5.0 VDC ± 2%, at the remote sensor. Voltage supplied by the controller to remote
analog transmitters should measure approximately 24 VDC nominal. This voltage is factory set
at time of manufacturing. If these voltages are not attained after installation, the wrong gauge
wire may have been used or the wiring run is too long.
The remote sensor housing comes with a 3/4” conduit thread and nut to allow installation in any
standard electrical junction box (to be supplied by the installer). Connect three low voltage wires
between it and the controller and observe polarity.
6.7.4 Relay Connections
System relays are dry contacts and designed to operate fan starters or coils to control equipment
that draws more than 5 amps start-up and / or operational current.
NOTES :
1. The system does not provide any power from these terminals. Dry contacts operate
like a switch to simply activate (switch on) or de-activate (switch off) equipment to be
controlled, such as fan starters.
2. System relays are S.P.D.T. (single pole, double throw) thereby providing one set of usable
dry contacts for each relay. Because the GEM series systems are designed to be fail-safe,
any equipment to be controlled by the system relays should be wired to the “NC” (Normally
closed) and “COM” (Common) terminals. The relay coils are normally energized in non-
alarm state for fail-safe operation.