7EN02-0423-00

Relay assignment

The device allows assigning various states to either of the relays (Preventive insulation alarm relay and Insulation alarm relay). These assignments can only be done through Modbus communication. The assigned states can be viewed on the HMI in Monitoring screen. Refer Vigilohm IM400N menu and Vigilohm IM400THRN menu.

The various states that can be assigned are:

  • Preventive insulation alarm

  • Insulation alarm

  • Injection inhibit

  • System error

    NOTE:

    The following states are identified as system error:

    • Disconnected injection

    • Over voltage

    • Over capacitance

  • Product error

    NOTE: Auto-test failure state is identified as product error.

Two registers are defined for this assignment. Refer Modbus registers table for details on the registers.

  • Insulation alarm relay bitmap (Register Address: 3044)

  • Preventive insulation alarm relay bitmap (Register Address: 3046)

For the assignment of states to each relay, use the bit configuration of these register as follows:

Bit Assignment
0 Preventive insulation alarm
NOTE: This bit is read-only for the preventive insulation alarm relay bitmap register (3046).
1 Reserved
2 Reserved
3 Reserved
4 Insulation alarm
NOTE: This bit is read-only for the insulation alarm relay bitmap register (3044).
5 Reserved
6 Reserved
7 Reserved
8 Injection inhibit
9 Reserved
10 Reserved
11 Reserved
12 Reserved
13 Reserved
14 Reserved
15 Reserved
16 System error
17 Reserved
18 Reserved
19 Reserved
20 Reserved
21 Reserved
22 Reserved
23 Reserved
24 Product error
25 Reserved
26 Reserved
27 Reserved
28 Reserved
29 Reserved
30 Reserved
31 Reserved

NOTE:
  • After factory reset,

    • insulation alarm relay bitmap is assigned with insulation alarm, product error, and system error bits.

    • preventive insulation alarm relay bitmap is assigned with insulation alarm bit, because the Prev. Alarm parameter is set to OFF.

    See Reset for more information on factory reset.

  • When the Prev. Alarm parameter is set to any value other than OFF, the preventive insulation alarm relay bit is assigned in the Preventive insulation alarm relay bitmap. You can also assign the preventive insulation alarm relay bit in the insulation alarm relay bitmap.

    See Insulation alarm and preventive insulation alarm threshold hysteresis for more information on Prev. Alarm parameter.

  • When the Prev. Al. Rel parameter is set to Mirror, the preventive insulation alarm relay bitmap is cleared to mirror the insulation alarm operation and you can not assign any bits in the preventive insulation alarm relay bitmap. You can assign bits when the Prev. Al. Rel parameter is set to Standard or Failsafe.

    See Preventive insulation alarm relay (Prev. Al. Rel) for more information on Prev. Al. Rel parameter.

  • When the Ack Inhibit parameter is set to OFF, the injection inhibit bit is cleared in insulation alarm relay and preventive insulation alarm relay bitmaps and you can not assign any bits in both the bitmaps. When the Ack Inhibit parameter is set to ON, the injection inhibit bit is assigned in the Insulation alarm relay bitmap. To assign the injection inhibit bit in preventive insulation alarm bitmap only, assign the bit in preventive insulation alarm bitmap and reset the bit in the insulation alarm bitmap.

    See Acknowledge inhibition (Ack Inhibit.) for more information on Ack Inhibit parameter.

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