Securitron PS-1M_Series - Manual

Securitron Magnalock Corp. www.securitron.com
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© Copyright, 2011, all rights reserved PN# 500-20400
Page 1 Rev. D, 08/11
SECURITRON POWER SUPPLY BOARD MODELS PS-12-1M,-PS-24-1M
OPERATION AND INSTALLATION INSTRUCTIONS
1. DESCRIPTION
Securitron's Model PS-12-1M is a 12 volt, 1 amp power supply board which converts 12-14 AC
voltage from a separately supplied transformer to adjustable, regulated DC voltage. The PS-24-
1M is the equivalent for 24-28 volts. The boards also include integral sealed lead acid/gel cell
battery charging capability. The DC output of these boards meets Class 2 electrical
requirements, which means under the National Electrical Code that output wiring need not be in
conduit. Always check with your local building department to make sure you are complying
with applicable wiring codes before installing these units.
2. SAFETY
The battery output of the boards (when implemented) presents a high energy hazard. If
shorted, the battery output can generate sufficient heat to ignite some materials. To insure
safety, insure that the board is mounted only in a lockable, approved enclosure which is
accessible only by trained service personnel.
3. OPERATING CHARACTERISTICS
3.1 TRANSFORMER CONNECTIONS
The transformer output (secondary) terminals connect to the low voltage AC input terminals on
the circuit boards (see Figure 2). There is no polarity to this connection. Specified
performance in terms of capacity will occur when (respectively) 14 volt and 28 volt
transformers with at least 1.5 Amp secondaries are used. Transformers often are rated by
their output capacity in Volt-Amps and this figure is derived by multiplying the output voltage
by the output (secondary) current capacity in Amps. So, for example, a 14 volt transformer with
1.5 Amp capacity secondary output would carry a volt-amp rating of 21 VA. For a 28 volt
transformer, the minimum VA rating would be 42.
Transformers with 12 and 24 volt outputs may be used (they are more readily available) without
problem, but the output capacity of the boards must be de-rated by 25%.
3.2 DC OUTPUT AND VOLTAGE ADJUSTMENT
The DC capacity of the boards depends on the exact voltage that is set, on whether or not
batteries are employed and on the fact that correct low voltage AC is supplied to the boards (14
or 28 volts). The boards can output 1 Amp when set at precisely 12 or 24 VDC. However, we
recommend that supplies not be operated at maximum capacity. This reduces the possibility of
heat induced failure and also allows for later expansion of the installation. When the boards
are used with batteries, available current capacity is reduced. This is because the
voltage must be set higher to 13.5 or 27 volts (these are the factory set values) and also
because some current is used to charge the batteries. 900 mA should be considered the
maximum output of a board used with batteries.
3.3 BATTERY CHARGING CAPABILITY
The boards incorporate a battery charging circuit appropriate for standby rated sealed lead acid
or gel cell batteries. Dry cell or NICAD batteries must not be used. Batteries are an option.
The power supply can be used with or without them. The battery pack of the appropriate
voltage is merely connected to the red and black battery leads following correct polarity. The
batteries will be kept charged at all times by the power supply acting in concert with the
components on the board. In the event of a line voltage power failure, the batteries will
automatically drive the load. If the emergency release terminals are opened, battery power will,
however, be cut off just as normal power from the power supply would be.