Specifications

Testing the Power Supply (PSU)

When power is first applied to the 108 PLUS PCB both the red and green LEDs (on

both channels of the PCB and both keypads) will flash 3 times in succession. This

indicates that power is present and that the microprocessors are running. If this power-

on sequence is not observed make the following checks:-

! To test the PSU disconnect all external connections to the output terminals ;

Check and/or replace all fuses; Check that mains power is present on the input

terminals. Please refer to safety information (page 5). Measure the PSU output

voltage; this should be approximately 13.8V on a functional PSU (model 340).

! Re-establish the two connections between the PSU and the controller PCB,

checking carefully the connections and the polarity. Re-check the PSU output

voltage. Make the measurement at both the PSU output terminals and the

controller PCB input terminals.

If the PSU output voltage is now zero or low:

! Check that Fail-Safe lock outputs are not short-circuited or that the lock releases

are not of too low an impedance; remove the connections and recheck the PSU

output voltage.

! Check all other connections to the controller PCB for short-circuits by

disconnecting them all, and re-checking the PSU output voltage; If the PSU

voltage recovers, progressively restore each connection until the fault condition

reappears, thus identifying the faulty conductor.

Testing The Lock Release Outputs

This test should be applied to each channel (Door A or Door B) of the 108 PLUS

separately

Ensure that the lock release in use is connected to the correct output (as shown in

Wiring Diagram 1). It is advisable to disconnect any connections to the ALARM output

temporarily for this test. The slide switch should be in the ‘RUN’ position.

Press and hold the PCB TEST button:

Both of the Lock Outputs (Fail-Safe and Fail-Secure) and the Alarm Output will

operate, and both red and green LEDs of the same channel will illuminate; the relays

on the PCB will also ‘click on’. If all is well the lock release will also operate.

If the LEDs turn on as described but the lock release fails to operate :

Check the lock release and its wiring by temporarily transferring the connections directly

across the power supply. The Controller PCB can be checked by measuring the voltage

output on the lock release pair; this should be the same as the power supply (13.8V).

Note: the fail-safe output will have voltage present except when the TEST button is

pressed.