User's Manual

APPLICANT: MOTOROLA EQUIPMENT TYPE: ABZ89FC4829
User / Operational Manual
Functional Description / Operation of Modules (Draft)
EXHIBIT D1-6
Power Supply Module Overview
The Power Supply is described in this section. The information provided is sufficient to give service personnel a
functional understanding of the module, allowing maintenance and troubleshooting to the module level. Refer to
the service manual for Maintenance and Disassembly/Reassembly Procedures for detailed removal or installation
procedures for all modules in the station.
An over-current condition on 14.2 VDC output causes the total supply to shutdown and try to restart. If the over-
current continues to exist, the power supply will ‘hiccup’ until the overload condition is removed, and will not be
damaged by the overload. The 14.2 VDC output goes into the hiccup mode when its output current is greater than
18A. The trip point for the 5.1 V output is greater than 115% of the maximum current specified for the output. The
power supply recovers automatically after the removal of the overload condition.
The 14.2 V output is protected from continuous over-voltages by detection circuits that cause the supply to
shutdown and then try to restart itself. If the over-voltage condition continues to occur, the supply goes into a
‘hiccup’ mode of shutting down and trying to restart. If the over-voltage condition is removed, the supply
automatically recovers. In addition, the 5.1 V output is protected by an over-voltage detect circuit that shuts down
both series regulators at the same time. The trip point of the over-voltage detection circuit is less than 16.8 VDC
for 14.2 VDC, and less than 6.0 VDC for 5.1 VDC.
An AC Fail detect signal is provided to indicate (when used with battery backup option) that the power supply is
operating from an external dc source rather than the ac mains. This signal is an open collector output capable of
sinking 1 mA, and is routed to the Station Control Module. The active-low state indicates ac operation. For the
nominal 120 VAC operation, the signal is active-high impedance (indicating an ac mains failure) when the ac
voltage is less than 85 Vrms, but more than the minimum voltage that guarantees that all outputs will be in
regulation at full load. For the nominal 240 VAC operation, the detect point is less than 170 Vrms but more than
the minimum ac input voltage that guarantees that all outputs be in regulation at full load.
The power supply will turn off all outputs when an operational ambient temperature of +80°C (±2°C) has been
reached with the supply operating at any input within its operating input voltage range (dc and ac).
The following shows the electrical performance specifications for the power supply.
Power Supply Module AC Performance Specifications:
Parameter Value or Range
Input Voltage Range 85 VAC to 264 VAC
Operating Temperature –30° to +60° C (–22° to +140° F)
Input Frequency Range 47 to 63 Hz
Steady State Output Voltage
14.2 V @ 16.5 A,
5.1 V @ 2 A
Output Power (Rated) 250 W
Output Ripple:
+14.2 VDC
+5.1 VDC
50 mV p-p, @ 25°C (77°F)
100 mV p-p, @ 25°C (77°F)
Efficiency Greater than 75% (Full Load)