Q: AC is fuse blowing on a PS914 when AC power is applied.
A: According to Allegion: If AC fuse blowing on a PS914 power supply then the mother board is defective. You need to replace the power supply with a new one.
Q: What will cause no output of 24V on the 900-2RS?
A: Checking the following items:
The setting of the PS914 is set on 24VDC
You measure 24VDC from the PS914 mother board
The 900-2RS is plugged into the PS914 power power supply
Either the fire alarm jumper is in place on the 900-2RS or the fire alarm is a normally closed dry contact attached to the 900-FA board
Measure the voltage between SC and GND on 900-2RS, it should measure 24VDC if not you have a defective 900-2RS board
Then check by closing the contact across SC & I1, it should measure 24VDC between O1 & GND.Q: What is the purpose of the 900-2RS board?
A: The 900-2RS option board is used with PS914 power supply to isolate the inputs such as key pads or card readers from the outputs for EL electric exit devices. The EL draws 16 amp inrush that needs to be isolated from access control contact.
Q: 900-2RS Specifications: > Inputs I1,I2 - Dry contacts required (Closed=Active) What is the trigger voltage for this input (my source is 12v)
A: What are you connecting to those imports - is it a card reader? If yes, the card reader is going to receive its own power. If you're powering with this power supply something like electric latch retraction on an exit device you could power your card reader separately with your 12 volt power supply.
Q: How is the EL exit device wired up to the 900-2RS?
A: The EL exit device connects to the O1 and GND, or O2 and GND of the 900-2RS board.
See attached instruction. PS914 Installation Instructions here:
Download File