Securitron PSM_Series - Manual (Page 6)

PN# 500-16200
Page 6 Rev. D, 08/11
minute or two. Once the battery is connected in, disconnect line voltage. The PSM should
illuminate its red "system disconnect" LED and disconnect the load by opening PSM terminals F1
and F2. There should be no output from the "P" terminals in the power supply. The system
disconnect relay contacts on the PSM should be in the deenergized alarm state. Reconnect line
voltage and the PSM should return to normal. Restore the 24 volt battery pack.
With a 12 volt PSM and power supply, it is more difficult to test system disconnect. If you have
a 6V battery, you can follow the procedure described above, but if you don't it's not easy to
produce the required low voltage except by disconnecting line voltage and waiting long enough
for the batteries to decline to system disconnect level. If you have a multiple battery pack,
using only one battery will make this time as short as possible. If you have no time to perform
that test, perform the test show in the previous paragraph by disconnecting line voltage with no
battery pack connected at all. This will at least show that the load releases properly.
If any of the tests fail, consult the factory. Do not put the system into operation.
7. SIGNALING SUMMARY
For reference, we are providing a summary of the meaning of different output signals from the
PSM.
PULSING SONALERT
Indicates a high or low voltage alarm that has persisted for 30 seconds. Can arise from
misadjustment of the power supply, a defect in the power supply or an interruption of line
voltage. Always accompanied by an output from the "trouble" contacts. This is a latching signal
that will continue even if the out of range voltage condition has corrected itself. Voltage must be
adjusted following the procedure explained in the final paragraph of Section 3.1 and then the
reset toggle must be pressed to clear the condition.
STEADY SONALERT
Indicates that one of the three minute battery load tests has failed. Accompanied by the red
"loading failed" LED and an output from the "trouble" contacts. The batteries can no longer be
considered reliable so the pack must be replaced. This latching condition is cleared by the reset
toggle.
"TROUBLE" CONTACTS
This signal is intended to summon an authorized person in a situation where the Sonalert would
not be heard. Indicates voltage out of range or the failure of a battery load test. Consulting the
LED's determine which fault has caused the "trouble" contacts to switch. This latching condition
is cleared by the reset toggle after the underlying problem has been corrected.
"ON BATTERY" CONTACTS
Signals that, for any reason, the power supply is no longer operating the load and the batteries
have taken over. The load will only operate for the period the batteries can provide backup.
Accompanied by the yellow "on battery" LED. 30 seconds later, the PSM will report a power low
fault and the pulsing Sonlalert will begin to sound together with its associated "power low" LED
and the "trouble" contacts.
"SYSTEM DISCONNECT” CONTACTS
Signals that the voltage operating the load has fallen below 10.5V (for a 12V system) or 21V (for
a 24V system) and power has therefore been removed from the load to avoid operation at an
indeterminate voltage. Proper voltage must be restored to recover from this condition.
8. CALCULATING BACKUP TIME FOR A BATTERY PACK
This is another reference section which explains how to calculate the approximate backup time
that a given installation can expect from a given battery pack. Knowing this figure allows the
end user to understand how much time he has to react to a power failure.
It should first be understood that the calculation is independent of voltage. It doesn't matter
whether the system is 12 or 24 volts. To make the calculation, you need only know the current
drawn by the load (expressed in Amps) and the capacity of the battery pack (in Amp-Hours).