Selection of which input controls which output, and which inputs are Style Z (Class A) and Style Y (Class
B) is done using the 10 position DIP switch on the printed circuit board. Refer to Section 5 for DIP switch
Auxiliary Power Output
The PAD-3 has a dedicated, power limited, auxiliary output that can be configured in two different ways.
The auxiliary output can either be non-resettable (always on), or configured to switch off when the AC
power goes off to conserve the battery standby power. When the auxiliary power is configured to switch
off, there is a 30-second delay before the auxiliary power is turned off after the AC power goes off. The
auxiliary power is for supplementary purposes only if it is configured to switch off when AC is lost.
The Auxiliary Power Output is rated at 3 amps. Only a total of 6 amps maximum can be drawn from the
PAD-3 outputs. The yellow Aux PS LED (DS5) will indicate an over-current condition on the output.
NOTE: The Auxiliary Power Output may be limited to 1.5 amps in certain circumstances. Please see
Section 6.2, Battery Size Calculation for more details.
Common Trouble Relay
The PAD-3 includes a form C trouble relay that will de-energize for the following trouble conditions:
No or Low AC power (With selectable delay between 60-180 minutes. Refer to Section 5.1.4 for delay
No and Low battery condition.
Ground fault to the output wiring.
Auxiliary Power Supply output over-current condition.
NAC output open, shorted and over-current condition.
AC Fail Relay
A normally energized relay will be de-energized after no or low AC power without delay. A Form "A"
contact provides a local signaling (audible and visual) of an AC fail at the protected premises.
Battery Charging and Supervision
The PAD-3 provides a battery charging circuit for charging sealed lead-acid batteries. The unit also
supervises for no and low battery conditions.
Ground Fault Detection
The PAD-3 monitors for ground faults to the output wiring. When detected, the unit lights the yellow
GRND LED (DS6) and de-energizes the trouble relay and the input supervision relays.
All hardware is suitable for use in an interior or protected location.
The AC power and battery wiring are not power limited. All other circuits leaving the control unit are power
limited, provided the proper installation rules are maintained.
Transient protection devices are provided where needed to meet the requirements of UL864.
1.2 REGULATORY STANDARDS
The PAD-3 meets the requirements of industry and government regulatory agencies as noted.
Federal Communications Commission
The PAD-3 meets the class A requirements of the Code of Federal Regulations (CFR 47), Part 15,
subpart J, for electromagnetic field emissions.
The PAD-3 control unit is listed under UL Standard 864 for compliance to NFPA Standard 72 for fire service.