Monitoring power system insulation

The device monitors the ungrounded power system insulation in resistance in accordance with the following timing diagram which represents the default settings:

1	An insulation fault is detected in the power system.
2	Once T has elapsed (alarm time delay), the device switches to the insulation alarm status. The insulation alarm relay changes over and the alarm LED lights up.
3	Press the button to acknowledge the insulation alarm. The insulation alarm relay reverts to its initial status. See Relay Mode for more information on relay modes. See Relay Acknowledgement for more information on relay acknowledgement.
4	When the insulation fault has been corrected, the insulation alarm relay changes over for 3s to confirm that insulation fault is located (For example: By opening circuit breakers to find the insulation fault).
5	The device reverts to normal status.

If you don't acknowledge the insulation alarm state, and the insulation rises again above the insulation alarm threshold, then the insulation fault is recorded as transient.