August 20, 2012 eMAX-MR51e-Man Rev B 8 of 17
7. Input Circuit Wiring:
Typically, the inputs of the eMAX-MR51e are used to monitor door position switches, request to exit devices, or
auxiliary alarm contacts. The operational defaults are; Input 1 for the Door 1 contact, Input 2 for the Door 1
Request to Exit, Input 3 for the Door 2 contact (or spare), Input 4 for the Door 2 Request to Exit (or spare). Input
circuits can be configured as Supervised or Unsupervised circuits. When unsupervised, reporting consists of
only the open or closed states.
When configured as Supervised, the input circuit will report not only open and closed, but will also detect and
report open circuit, shorted circuit, grounded circuit, and foreign voltage. A supervised input circuit requires
two resistors be added to the circuit wiring to facilitate proper reporting. The standard supervised circuit
requires two (2) 1K Ohm, 1% resistors and should be located as close to the sensor as possible.
Note: Grounded and foreign voltage states are not a requirement of UL 294 and therefore not verified by UL.
The input circuit wiring configurations shown are supported but may not be typical:
8. Relay Circuit Wiring:
Two relays are provided for controlling door lock mechanisms or alarm signaling. The relay contacts are rated
at 5A @ 28Vdc, dry contact configuration. Each relay has a Common pole (C), a Normally Open pole (NO) and a
Normally Closed pole (NC). When controlling the delivery of power to the door strike, the Normally Open and
Common poles are used. When momentarily removing power to unlock the door, as with a mag lock, the
Normally Closed and Common poles are used. Check with local building codes for proper egress door
installation.
Door lock mechanisms can generate feedback to the relay circuit that can cause damage and premature
failure of the relay. For this reason, it is recommended that either a diode or MOV (metal oxide varistor) be
used to protect the relay. Wire should be of sufficient gauge to avoid voltage loss.
