Approved for installation in I.S. / Ex zone 2 / Div. 2
Optional redundant supply for the power rail
Must be installed on the power rail, PR type 9400
The power control unit detects errors from any of the devices mounted on the power rail and transmits a collective alarm to the control system via the internal status relay.
Optional connection of two power supplies – a primary supply and a backup supply.
Redundant supply for the power rail can be obtained by mounting two 9410 devices connected to 2 separate power supplies (e.g. PR no. 9421).
The status relay will be energized when the following three conditions are met:
1. Supply voltage is present on pins 31 and 32.
2. Backup supply voltage is present on pins 34 and 33. (If the backup supply is not in use, a jumper must be placed between pins 32 and 33 – the jumper is delivered with the device).
3. There are no error messages from the devices connected to the power rail.
When a collective alarm is activated via the power rail, the status relay in the 9410 will be de-energized (pins 11, 12, and 13).
Two green front LEDs indicate the connection of supply and backup.