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HA71 Digital Gas Controller
3.1.2 Optional Discrete Relay PCB
An optional Discrete Relay PCB, shown in Figure 3-4, adds eight 5
amp (resistive) form C relays per sixteen channel alarm group (2 PCB's
required when utilizing more than 8 channels). Each PCB may be
configured via rotary switch S1 to function for ALARM 1, ALARM 2 or
ALARM 3/FAULT for channels 1-8 or 9-16. A 1-minute time delay after
power is provided to inhibit relay actuation until the system has had
time stabilize. Alarm groups, or zones, may be created by connecting
adjacent channels together using JP4 as shown. This creates a wire
OR function with selected channels, causing any alarm included within
the zone to actuate ALL zone relays. Failsafe operation of 10-0195
discrete relays is not allowed but may be programmed for the common
relays in the system menu as described in
applications utilize the common alarm relays (see
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 HA71 Controller via the slender I
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 HA71
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 HA71front panel assembly, bypassing the
I
2
C cable. A 20 AWG pair connected to only one of the several TB2's
is sufficient when these boards are in close proximity to each other.
CAutIoN
All relays are rated at 5 Amp for 28 VDC and 250 ~VAC RESISTIVE
loads. 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.
HA71 Technical Manual
Section
2.3.2. Many HA71
Section 3.0
) and
2
C cables connected to J2
3-4
TB2 is used to supply external
5VDC power to Alarm boards
when they are mounted > 5
feet from the controller. I
2
C
ASSY# 10-0195 8-CH DISCRETE RELAY
cables provide 5VDC but losses
Wire TO CPU
5VDC if > 5'
occur with longer cable lengths.
from controller
5VDC ONLY!
+
WARNING: Voltages exceeding
-
6 volts may cause extensive
TB2
damage to entire controller.
U3
Standard configuration has a 1
Q2
minute POWER ON time delay
SB1
preventing relay actuation during
the delay. SB1 increases delay
time to 8-minutes. SB2 removes
all time delay.
NO C
NC
C
H
1
9 /
NO C
NC
C
H
/ 2
0 1
5 amp form C dry contacts. Contacts are unfused. Switching
inductive loads may create high levels of RFI. Use appropriate
"RFI Snubbers" on inductive load devices.
Figure 3-4. 8 Channel Discrete Relay Option 10-0195
S1 controls if discrete relays are tripped by
A1, A2, or A3 alarms for Ch's 1-8 or 9-16.
See Chart.
8-CH CHART
WITH 8 RELAYS:
S1-2=Ch9-16 A1
S1 selects Ch's 1-8
S1-3=Ch9-16 A2
or 9-16 for A1, A2 &
S1-4=Ch9-16 A3
A3 (Flt) See chart--->
S1-5=Ch1-8 A1
0
S1-6=Ch1-8 A2
S1-7=Ch1-8 A3
J2
S1
J2 & J3 are interchangable I
U1
connectors used to add option
PCB assemblies to the controller.
J3
SB2
U2
JP4 allows "zoning" of adjacent
JP4
Ch1
ZONE
channel alarms. All zoning jumpers
Ch2
JUMPERS
are placed vertically. Dwg. exhibits
Ch3
Install
Ch4
channels 1-4 and channels 5-7
vertically
Ch5
creating 2 zones. All relays in a zone
to create
Ch6
Ch. zones
switch together. Unused jumpers
Ch7
may be stored horizontally.
Ch8
NO
C
NC
NO
C
NC
NO C
NC
TB1
C
H
/ 3
1 1
CH5/13
C
H
/ 7
5 1
NO
C
NC
NO
C
NC
NO C
NC
C
H
/ 4
2 1
CH6/14
C
H
/ 8
6 1
Revision 3 (04/08)
2
C
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