Selecting the IED test mode - Arc protection - Bay control and measurement - Merging unit - Transformer protection - 2 winding - Feeder protection - Voltage regulation - Capacitor bank protection - Grid automation - Busbar differential protection (high impedance) - Line differential protection - Back-up protection - Motor protection - Busbar protection (voltage and frequency) - Interconnection protection - Generator protection - Power management/Load shedding - Operation Manual - REX615 Protection and control - PCL2 - IEC - ANSI - 01.04.2026

REX615 Operation Manual

The test mode can be activated using the LHMI. The green Ready LED is flashing to indicate that the test mode is activated. By default, the test mode can only be changed from the LHMI. Activation by remote client is possible, see the technical manual.

Note: The Ready LED also flashes if the protection relay detects a diagnostic failure. Check the test mode setting and the protection relay's IRF alarm contact status to find the reason for the failure.

The test mode is useful for simulated testing of functions and outputs without providing current inputs.

  1. Select Main menu > Tests > IED test > Test mode and press .
    Figure 1. Entering test mode

  2. Select the test mode status with or .
  3. Press to confirm the selection.
Note: If the test mode is not cancelled, it remains on and the Ready LED remains flashing.