®
APS-524
POWER SUPPLY
aps524_en 04/16
The APS-524 power supply unit has been designed for use with 24 V DC electrical
installations (e.g. access control systems). Due to application of an energy-efficient pulse
power system, supplied directly from the mains with 230 V AC, the thermal losses have been
minimized, while the reliability have been enhanced. The APS-524 has an input interference
filter and a power factor compensation system, as well as short-circuit and overload
protection.
Precision voltage control, microprocessor-based battery charge status control and automatic
cut-off of the battery function in case of its excessive discharge, enable the battery to be used
longer without any risk of being damaged. It is recommended that two series-connected 12 V
lead batteries, 17 Ah capacity each, be used for operation with the APS-524.
The APS-524 is fitted with four LEDs, which indicate: the mains supply and battery condition,
current overload, and excessive temperature rise. The detected troubles are signaled on the
four OC type outputs and may be additionally signaled by the buzzer. During normal
operation of the APS-524, the signaling outputs are shorted to ground (0V), but when a fault
occurs, the respective output is cut off from the ground. The tamper contact, installed on the
housing, makes it possible to include the APS-524 into the tamper circuit of the alarm
system.
1. Power supply description
Four LEDs are provided on the power supply housing:
1
–
[
MAINS
]
(green):
ON – normal operation, with 230 V AC voltage present on the input,
OFF – no 230 V AC voltage or F1 fuse blown.
2
–
[
BATTERY
]
(green):
ON – battery voltage OK,
blinking – battery voltage drop below 22 V,
OFF – no battery or F3 fuse blown (6.3 A).
Note: If there is no load at the power supply output, the
LED indication can be
unstable. For a proper battery state indication, at least 200 mA load of the output
is required.
3
–
[
OVERLOAD
]
(yellow):
OFF– normal operation.
ON – current consumption in excess of 5 A.
4
–
[
TEMPERATURE
]
(red):
OFF – normal operation
blinking – elevated working temperature (above 45 °C) if there is no fan, or fan
trouble (if the fan is installed).
ON – dangerous working temperature (above 65 °C), which may cause
damage to the power supply unit.
