Warning
Hazard of Electric Shock: Remove all power from all devices before removing any covers or doors of the system. Disconnect power at the device and at the power source.
Electrostatic Discharge Required: Always discharge static electricity from your person by touching metal prior to handling any hardware. Failure to do so may result in damage to devices.
Issue
ACX57xx Continuum controller frequently reboots itself, loses configuration and/or stop granting access to doors until reloaded.
In the controller error log frequent and spontaneous re-starts of the controller can be observed without an apparent cause such as power failure for example.
Here is another error log from different controller with same issue, a similar signature can be observed in the following screen shot
Product Line
Andover Continuum
Environment
Continuum ACX 2 Controller
Continuum ACX 4 Controller
Cause
Electrical noise coming from door striker corrupting controller's memory.
Resolution
An external Varistor may be installed for Noise Suppression of a Door Strike. Here is a link to a part that may be used for this purpose:
The part should be installed at the Door Strike, from the switched 24VDC terminal to the common 24VDC terminal, like this:
