Keyscan Technical Guide (PC109x - 04.12)
33
Important
The total combined current of the devices must not be greater than the current rating of the power supply.
Relay Status Jumpers
Relay boards have jumpers that may be set to “Normal” or “Reversed”. Each relay has an LED that indicates
the relay status:
• Normal – LED on the circuit board is not illuminated when door is locked
• Reversed – LED on the circuit board is illuminated when door is locked
Diodes are supplied with Keyscan access control unit(s). Diodes must be installed across all D.C. door strikes
as shown in Figure 24 on page 36. The cathode of the diode is connected to the positive side of the strike at
the door. The anode of the diode is connected to the common return wire.
Diodes must be installed for proper operation.
Fail Safe/Fail Secure Lock Devices
The power supply's positive output must be connected to the common door relay outputs, which are labeled on
the relay board.
For ‘fail-safe’ and ‘fail-secure’ door strikes, observe the following relay connections:
• ‘Fail-Safe’ – Connect the positive terminal on the door strike to the 'Normally Closed' position on the relay
board. Connect the return wire to the Common on the DC power supply via the ground lug on the metal
enclosure.
• ‘Fail-Secure’ – Connect the positive terminal on the door strike to the 'Normally Open' position on the
relay board. Connect the return wire to the Common on the DC power supply via the ground lug on the
metal enclosure.
Warning
Before securing any exit, please ensure all wiring to electrical door hardware conforms to federal, state,
provincial, or municipal fire and building codes.
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