Preventive insulation alarm relay (Prev. Al. Rel)

You can set the preventive insulation alarm relay mode depending on the status of insulation.

The allowed values for this parameter are FS, Std., and Mirror. The default value is FS.

When the preventive insulation alarm relay is configured in failsafe (FS) mode:

• The preventive insulation alarm relay is activated, that is, energized, in the following case:

  • No insulation fault is detected.

  • No preventive insulation fault is detected.

  • Transient fault is detected.

  • Insulation fault is detected and acknowledged (if Menu > Settings > I/O Config. > Ack. Al. Relay is set to ON). (See Insulation alarm relay acknowledgement (Ack Al. Relay))

  • Injection is inhibited (if Menu > Settings > I/O Config. > Ack Inhibit is set to ON).

    (See Acknowledge inhibition (Ack Inhibit.))

• The preventive insulation alarm relay is deactivated, that is, de-energized, in the following cases:

  • First measurement

  • Preventive insulation fault is detected.

  • Insulation fault is detected.

  • Insulation fault is detected and acknowledged (if Menu > Settings > I/O Config. > Ack. Al. Relay is set to OFF). (See Insulation alarm relay acknowledgement (Ack Al. Relay))

  • When you trigger an auto-test with relays, the relay toggles for 3 seconds. (See Test with relays (Test w. Relays))

  • The auxiliary power supply is lost.

When the preventive insulation alarm relay is configured in Standard (Std) mode:

• The preventive insulation alarm relay is activated, that is, energized, in the following case:

  • Preventive insulation fault is detected.

  • Insulation fault is detected.

  • When you trigger a auto-test with relays, the relay toggles for 3 seconds. (See Test with relays (Test w. Relays))

• The preventive insulation alarm relay is deactivated, that is, de-energized, in the following cases:

  • First measurement

  • No insulation fault is detected.

  • Insulation fault is detected and acknowledged (if Menu > Settings > I/O Config. > Ack. Al. Relay is set to ON). (See Insulation alarm relay acknowledgement (Ack Al. Relay))

  • No preventive insulation fault is detected.

  • Transient fault is detected.

  • Injection is inhibited (if Menu > Settings > I/O Config. > Ack Inhibit is set to ON) (See Acknowledge inhibition (Ack Inhibit.))

  • The auxiliary power supply is lost.

When the preventive insulation alarm relay is configured in mirror (Mirror) mode:

• The preventive insulation alarm relay mirrors (symmetrically matches) the insulation alarm relay as long as the device is operating correctly.

• The preventive insulation alarm relay stops mirroring the insulation alarms when the device is de-energized or inoperative. You can identify an inoperative product using this feature.