Unable to input the primary or secondary voltage transformer ratio into VAMP321 Arc Flash Mitigation relay

Issue: Unable to input the primary or secondary voltage transformer ratio into VAMP321 Arc Flash Mitigation relay using the VAMPSet software

Cause: Configuration

Resolution: By default the VT or PT is set to Uo which is for a residual voltage measurement. If a line to neutral or line to line VT is being used, the Voltage measurement mode (available in the SCALING section) must be set to 1LN or 1LL, this change must then be loaded into the VAMP321. Once this is complete you must refresh the view from the device to open the VT primary and VT secondary options. Enter th correct VT ratio and send this change to the VAMP321.