PAL-AT Installation Manual
11
2.2 Terminals
The terminals on the PAL-AT system board use a quick-connect design that provides an easy, fast and
robust connection. A flat blade screwdriver, 1/8” [3.5 mm], is used to press down on the terminal lever
and open the terminal for easy wire insertion. Release the lever, and the wire is tightly clamped. The
acceptable wire size for connection to any terminal, including the mains, is 28 - 12 AWG [0.08-2.5
mm
2
]. The terminals can accommodate solid or stranded wires. If ferrules are used with stranded
wire, the maximum wire size is 14 AWG [1.5 mm
2
]. Refer to the detail located at the upper right side
of figures 2-2 and 2.3. Caution: The lever only travels 1/8” [3.5 mm] to open the terminal completely,
and only requires 5 - 8 lbs [2-4 kg] force. Do not exceed these limits or the terminal will be
damaged.
2.3 Power Connection
The PAL-AT must be permanently wired to instrument-quality power using appropriate certified conduit,
fittings, and wiring. Refer to figures 2-2 and 2-3 wiring diagrams for details. The PAL-AT contains a universal
power supply. The power requirement is 110-240 VAC, 50 / 60 Hz, 0.3 A / 50 VA.
A suitable external over-current protection device, such as a fuse or circuit breaker (15 A), and disconnect
device is recommended. The over-current protection and disconnect devices shall be installed on all
ungrounded conductors, i.e. the terminal marked hot (L) (and neutral (N) terminal if ungrounded for 240
VAC). The disconnect device shall be located near the equipment and marked with appropriate ON (l) OFF
(O) markings as specified by local codes. The ground conductor shall have green with a yellow stripe
insulation and be connected to the grounding connection on the upper right corner of the back panel as
shown. Installation should be performed by qualified personal in accordance with local codes and
procedures.
The PAL-AT can also be powered by a 24 VDC, 1 A / 24 VA, over-current protected power source at terminal
T5. Fuse F1 on the PAL-AT system board protects the 24 VDC input. It is a 2A, 250 V, time-delay, 5 x 15
mm fuse.
Caution - Before accessing the PAL-AT panel, the panel must be disconnected from the power
source and isolated from any hazardous voltage present in the panel, e.g. relay wiring.
Three internal switches on the system board control the power source utilized by the panel. These switches
are intended for use by service personnel. Set the AC Power Switch (SW3) and the 24 VDC Power Switch
(SW1) in the down, or “OFF” position. Next, set the Input Power Select Switch (SW2) to either VAC or VDC
depending on the desired power source. The panel is controlled by SW3 for AC power or SW1 for DC
power.
2.4 Audible Alarm Wiring
An internal 90-dBA pulse horn is supplied. An optional chime alarm is available. The wiring for the horn
is a 2-wire cable connected to terminal strip T6. The red wire must be connected between the “+” terminal
on the horn and the “+” T6 terminal. The black wire must be connected between the “-” terminal on the
horn and the “-” T6 terminal. The terminal provides 24 VDC @ 10 mA.
2.5 Control Relays
PAL-AT has 3 to 6 SPDT output relays, depending on the model, rated for 250 VAC, 10 A. They are
labeled “Fault Alarm”, “Common Alarm” and “Cable x”, where x=1 to 4 for the appropriate cable number
(see figures 2-2 and 2-3). The relay contacts are labeled in their unpowered or “on-the-shelf” condition.
The fault relay energizes when the panel is powered and monitors for a power fault.
The common alarm relay switches state in response to any fault condition. The # key can be pressed to
reset the common alarm relay to its normal state and deactivate the internal audible alarm for up to 96
hours. The default reset time is 12 hours.
The cable relay(s) will activate when a fault is detected and will reset when the fault returns to normal or
the alarm queue is cleared. The default setting is to activate for all alarms, but it is firmware selectable to
activate in response to only leak and probe active alarms.
Control devices or auxiliary equipment should be connected to the cable relay(s) so they will not
be reactivated when the alarm is silenced. PAL-AT is shipped with the common alarm and cable
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