Regulatory Standards; General Specifications - Siemens PAD-4 Installation, Operation And Maintenance Manual

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PAD-4 Installation, Operation and Maintenance Manual
different ways. The auxiliary output can either be
non-resettable (always on), or configured to
switch off when the AC power goes off to con-
serve 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 (or 9 amps depending
on power supply) can be drawn from the PAD-4
outputs. The yellow Aux PS LED (DS5) will flash to
indicate an over-current condition on the output.
The LED will go off if the battery conservation
feature is active.
Common Trouble Relay
The PAD-4 includes a Form C trouble relay that will
de-energize for the following trouble conditions:
• No or low AC power (Refer to Section 5.1.4
for delay time settings).
• No and low battery condition.
• Ground fault to the output wiring.
• Auxiliary power supply output over-current
• NAC output open, shorted and over-current
• Failure of the battery charger.
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-4 provides a battery charging circuit for
charging sealed lead-acid batteries. The unit also
supervises for no and low battery conditions.
Battery Cutoff
In order to protect the batteries when AC fails, the
battery voltage is constantly monitored, and if it
drops below 20.4V, all PAD-4 power will be cut
off. Power will be restored when AC is restored.
Ground Fault Detection
The PAD-4 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. In
addition, in ULC configuration, the ground fault
relay on the PAD-4-CLSA module is also ener-
gized. Ground fault indication is common to all
output circuits and all NAC outputs are to be in
the same evacuation zone.
All hardware is suitable for use only in an indoor,
dry environment.
Power Limiting
The AC power and battery wiring are not power
limited. All other circuits leaving the control unit
are power limited.
Transient Protection
Transient protection devices are provided where
needed to meet the requirements of UL864.


The PAD-4 meets the requirements of industry
and government regulatory agencies as noted.
Federal Communications Commission
The PAD-4 meets the Class A requirements of
the Code of Federal Regulations (CFR 47), Part
15, subpart B, for electromagnetic field emissions.
Underwriters Laboratories
The PAD-4 control unit is listed under UL Standard
864 and UL 1481. It also complies with ULC


Operating specifications for the PAD-4 are as
• Operating temperature
32 - 120°F (0 - 49°C)
• Relative humidity
Up to 93%RH @ 86°F (30°C) non-condensing

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