WX16 User Manual | 31
10-0195 discrete relays may be programmed in the
system
menu as described in
section 2.3.2. Many WX16 applications utilize the common alarm relays (see section
3.0) and do not require discrete relays for each of the 48 alarm events (16 A1’s, 16
A2’s & 16 A3’s). If discrete relays are needed for all 48 alarms, then six PCB’s are
required.
5 VDC power to the discrete relay option PCB’s is normally supplied from the WX16
Controller via the slender I
2
C cables connected to J2 and J3. However, I
2
C cables are
limited in ability to carry this power further than a few feet without a significant voltage
drop. Some WX16 applications with relays for all 48 alarms may require up to 6
boards. TB2 allows a heavier 5 VDC power cable to be connected from terminals on
the back of the WX16 front panel assembly, bypassing the I
2
C cable. A 20AWG pair
connected to only one of the several TB2’s is sufficient when these boards are in close
proximity to each other.
All relays are rated at 5 Amp for 28 VDC and 250 ~VAC
RESISTIVE
loads.
IMPORTANT: Appropriate diode (DC loads) or MOV (AC loads) snubber
devices must be installed with inductive loads to prevent RFI noise spikes.
Relay wiring should be kept separate from low-level signal wiring.
Summary of Contents for WX16
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