Insulation alarm relay acknowledgement (Ack Al. Relay)

You can set the insulation alarm relay acknowledgment as per the usage of loads connected to the relay.

When the relays are connected to loads (for example, horns or lamps), it is advised to turn off these external signaling devices before the insulation level rises back to a level above the setup thresholds. This can be done by pressing the acknowledge button while in insulation alarm state.

In certain system configurations, it is required to prevent this type acknowledgement and only retrigger the relays when the insulation level rises above the setup thresholds. This is done by changing the corresponding parameter.

The allowed values for this parameter are ON and OFF. The default value is ON.

To set the acknowledge alarm relay ON, select Menu > Settings > I/O Config > Ack Al. Relay > ON.

To set the acknowledge alarm relay OFF, select Menu > Settings > I/O Config > Ack Al. Relay > OFF.

The device monitors the ungrounded power system insulation in accordance with the following timing diagram:

Acknowledge alarm relay ON

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.
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.

Acknowledge alarm relay OFF

1	An insulation fault is detected on the 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 turns on.
3	Press the button to acknowledge the insulation alarm. The insulation alarm relay does not reverts to its initial status.
4	The insulation fault is corrected. The alarm LED turns off. The device reverts to normal status.