Relay assignment

The device allows assigning various states to either of the relays (Preventive insulation alarm relay (PREV. AL. REL) and Insulation alarm relay (INS. AL. 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 (Pre.Alarm)
Insulation alarm (Alarm)
Injection inhibit (Inj. Inhibition)
System error (System Error)
NOTE:
The following states are identified as system error:
- Disconnected injection
- Over voltage
- Over capacitance
Product error (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.