PAL-AT Operating Manual
52
Appendix A - Output Relay System
The PAL-AT Output Relay System consists of an electronic microprocessor-based interface and control
panel that monitors a PAL-AT Leak Detection/Location System and controls from 4 to 60, 10-amp 250-volt
rated relays. The output relays are available in groups of 4. There are four PAL-AT Output Relay System
components available:
Model Description
AT-ORC Output Relay Controller Panel with 1 Relay Module (expandable to 2)
AT-RM Relay Module with 4 relays
AT-ORx1 Output Relay Panel with 1 Relay Module
AT-ORx4 Output Relay Panel with 1 Relay Module (expandable to 4)
A.1 Installation of Output Relay System
1. Refer to figures A-1, A-2, and A-3 while reading these instructions.
2. The standard AT-ORC Output Relay Controller Panel must be permanently mounted within 25 feet of
the PALAT Leak Detection/Location Panel.
3. The optional AT-ORx1/AT-ORx4 Output Relay Panel(s) must be permanently mounted adjacent to the
AT-ORC Output Relay Controller Panel or other Output Relay Panels. The maximum distance
between panels is 2 feet.
4. All panels must be located in an area with an ambient temperature of not less than 0°F and not
exceeding 120°F. If a panel is located outside, watertight conduit fittings and associated hardware
must be used in order to keep the NEMA 4X rating of the enclosure. The enclosure must not be
located in direct sunlight to prevent excessive heat buildup.
5. Connect the AT-ORC to a 120/240 VAC 50/60 Hz circuit.
6. Each AT-ORx4/AT-ORx1 Output Relay Panel includes a 48” power cable. The power cable should
be connected between the connector on the +5VDC pigtail on the main controller board and connector
on the “Y” pigtail on the AT-RM in the first AT-ORx4/AT-ORx1 panel. If more than 1 AT-ORx4/ AT-
ORx1 is installed, the power cable is installed from the “Y” of the first panel to the “Y” of the next one,
etc.
7. Each AT-ORx4 Output Relay Panel also includes 4 ribbon cables. All ribbons will only be used if 4
AT-RMs are installed (save extra ribbons for later expansion in the panels). There are two #1 ribbons
that are each 2” long and connect plug P2 to plug P3 on adjacent AT-RMs. A 10” ribbon, ribbon #2,
is used inside the panel to connect P2 and P3 as shown. The 36” ribbon, ribbon #3, runs from P4 on
the AT-ORC to P2 on the first Output Relay Module in the first AT-ORx1/AT-ORx4. If additional AT-
ORx1/AT-ORx4 Output Relay Panels are installed, the 36” ribbon connects from P3 on the previous
panel to P2 on the first AT-RM in the present panel.
8. Each AT-ORx1 Output Relay Panel includes a 36” ribbon. It runs from P3 on the previous panel to P2
on the AT-RM in the present panel.
9. Three additional AT-RM Relay Modules may be added to each AT-ORx4 panel. 4 plastic mounting
standoffs are installed in the AT-ORx4 for each module. Carefully align the holes in the module with
the standoffs and press the AT-RM into position. Then connect the ribbon cables as described above.
10. It is recommended that all external wiring be run in conduit.
11. Locate the Auxiliary Header (see section 4.5). Place a two-pin shunt horizontally in position 2,
connecting across the 2
nd
pins on the left and right side. The shunt must be in this position for PAL-
AT to communicate with the AT-ORC.
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