Universal Power Supply
Section 3 – A17 Power Supply Module
O & M Manual
A14-RK, 8/06 3-
1
A17 UNIVERSAL POWER SUPPLY
The power supply module used in the
GasSens
system (part #00-0055) is a self-adjusting supply that
will accept the AC power provided in virtually every country in the world. Any AC (50-60 Hz.) or DC
voltage from 85 volts to 270 volts can be connected to the power input terminals on TB4. There are no
adjustments of any kind required.
The output of the power supply is a regulated 13.7 VDC. There are 3 sets of DC terminals at the top
of the module for connection to receivers and external battery back-up unit. This voltage permits float
charging of a an optional separate 12 volt lead acid battery for detector system back-up.
Power supply modules are rated for 1 ampere output, and will deliver higher current for periods. Each
optional receiver module draws a maximum of 300 mA, and will normally draw about 125 mA. The
optional external battery back-up unit can draw up to 750 mA for a few hours if the battery is deeply
discharged, which will drop sharply as the battery approaches full charge. The audible horn draws less
than 10 mA average current, and an optional strobe will draw approximately 400 mA when activated.
The power supply is internally fused at 2 Amps. The fuse is not user replaceable. (Note: Only
Qualified Service Personnel will replace the fuse, using the same type and rating as indicated on the fuse.)
The power supply has a power-on indicator LED and provides a SPDT relay to indicate power failure.
The relay coil is energized by power from the input power terminals and will de-energize if power is lost.
This relay is convenient for input to telemetry systems to indicate loss of power at a remote site.
Mounting of power supply modules is done by clipping them to a standard 35 x 7.5 mm DIN rail. A
spring loaded clip holds the module to the rail and is used for mounting and removal. From the front, the
clip is seen as a black loop at the top rear of the module. To remove from a rail, place a small screwdriver
into the opening in the black loop and pull outward until the module releases from the rail. Reverse the
procedure to mount the module.
CAUTION
The power supply module is sealed, and the seal should not be broken. Never attempt to
disassemble or service the power supply module. Service on this module should only be done
only by a qualified service technician familiar with the circuit design and equipped with the proper
service equipment. Severe electrical shock may result from touching internal components with
input power applied.
