Securitron PSM_Series - Manual

Securitron Magnalock Corp. www.securitron.com
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© Copyright, 2011, all rights reserved PN# 500-16200
Page 1 Rev. D, 08/11
SECURITRON MODEL PSM-12, PSM-24 POWER SUPPLY MONITOR
INSTALLATION AND OPERATING INSTRUCTIONS
1. DESCRIPTION
The Power Supply Monitor is a microprocessor controlled product which provides comprehensive
monitoring of a strictly regulated battery charging power supply. Separate versions are
available for 12 and 24 volt power supplies. The PSM performs a series of continuous and
periodic tests to detect possible problems with the power supply and battery pack. Failure of
any of these tests is reported by both local and remote signals. The PSM can therefore be used
as a stand alone monitor or it may be connected to an alarm system.
The PSM also reports any time the batteries are switched into the load circuit (from a local
power outage for instance). Finally the PSM will disconnect the batteries from the load when
their output falls below 88% of nominal. This is to preserve them from going into deep
discharge and to prevent the load receiving a low voltage that may cause operational problems.
2. APPLICABLE POWER SUPPLIES
The Power Supply Monitor is qualified for use with Securitron power supplies models: BPS-12-3,
BPS-12-4.5, BPS-12-6, BPS-12-9, BPS-12-15, BPS-24-2, BPS-24-3, BPS-24-4, BPS-24-6, and
BPS-24-10. It is not qualified for use with Securitron 1 Amp power supplies. There are
two reasons for this. First, the PSM requires power to operate: 200 mA @ 24 volts; 250 mA @
12 volts and therefore reduces the total capacity of the supply. It is hard to justify its use with a
small capacity supply. Second, Securitron 1 Amp supplies are not "strictly" regulated. This
simply means that their output voltage varies somewhat with the load. While this does not
cause operational problems (the variation is low), it would create constant "false alarms" on the
part of the PSM, which expects strict regulation.
The issue of using the PSM with non Securitron power supplies is uncertain. The
general type of supply that can be used with the PSM is one that will operate the load with or
without batteries. When batteries are added, they are continuously trickle charged and
automatically take over the load (generally through a diode), only when the normal DC output of
the power supply drops out. The specific supply, however, may have some operating
characteristic that makes it unsuitable for use with the PSM. Check with the factory.
3. TESTS
3.1 VOLTAGE LEVEL TESTS
To properly charge the batteries, the power supply should output a precise voltage: 13.65 volts
for a 12V battery pack and 27.3 volts for a 24V battery pack. If the voltage is too low, the
batteries will never get fully charged. If it is too high, they will heat up and suffer reduced life-
span. The PSM continually monitors this voltage and will report a low or high failure. If the high
or low condition in output voltage is short lived, it will be ignored. A good example of this is a
momentary drop in voltage caused by a large load being switched in. The out of range voltage
condition must be maintained for 30 seconds for the PSM to report it.
Once the high or low condition is maintained for 30 seconds, the PSM will report it in latching
fashion. A "high" or "low" yellow LED will illuminate on the PSM enclosure cover, the Sonalert
will emit a pulsing output and SPDT "trouble" contacts will switch for remote signaling. This
signal will be maintained even if the out of range voltage condition has corrected itself. The
power supply should still be examined. To reset the unit, voltage should be adjusted to the
correct level and then the reset toggle on the enclosure cover should be momentarily depressed.
Power supply adjustment should be done as follows. With the PSM connected to the power
supply as explained in Section 5, identify the voltage adjustment potentiometer on the power
supply. Slowly turn the pot so as to increase the voltage until the green "power normal" LED
just turns off. Then slowly turn the pot in the opposite direction (the green LED will immediately
come back on) until the green LED turns off because of low voltage. Center the pot between
these two points of movement. If you have a voltmeter to confirm your result, voltage should
be at roughly 13.65V for a 12 volt unit and 27.3V for a 24 volt unit.