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iPB4 Biometric Device Range – Installation & User Guide – Rev 07 ©2017-2018 iPulse Systems
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5.1 Wiring Diagram – Fail Closed
This is the most common wiring diagram and is used when a door needs to be configured in such a way
that if the power is cut, the door remains locked.
High security doors, such as entry/exit doors to buildings, should always be wired with this configuration,
but it is important to note that there should always be an override switch, especially on the inside, in case
of fire.
5.2 Wiring Diagram – Fail Open
This is a less common wiring diagram, and it is normally used when a door needs to be configured in such
a way that if the power is cut, the door remains open. This normally applies to non-critical internal doors.
Figure 7 - Wiring Diagram - Fail Closed