Relevant for:

A UPS (uninterruptible power supply) ensures that devices continue to operate during a fault. Depending on the type of UPS, it can protect against the following disturbances:

  • Power failure

  • Overvoltage

  • Undervoltage

  • Frequency changes

  • Harmonics

The RevPi cannot monitor the UPS itself, only the UPS status output. The status output is connected to the digital input on the X2 connector (on the RevPi Connect 4, the lower X2 connector).

▷ Check whether the status output of your UPS is suitable for connection to the digital input of the RevPi.

▷ Connect the status output of the UPS to the digital input according to the specifications of the UPS manufacturer:

▷ Test the UPS status monitoring.

In the process image, bit 6 of the RevPiStatus variable is 0 or 1, depending on whether 0 V or 24 V is applied to the input. Your application must read this bit cyclically. If the UPS reports a problem, your application must take appropriate action. The required action depends on:

  • the capacity of the battery used,

  • the power consumption of the RevPi,

  • the power consumption of all components additionally connected to the UPS.

Typically, the system is brought into a safe state and the RevPi is shut down.