Ampcontrol Pty Ltd
– ABN 28 000 915 542
IPM V2 USER MANUAL
IPM2B003 Revision 15
– MAY/18
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 25 of 83
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4.4.5 Terminals 15 & 16
Do not connect. These terminals are unused in this version of the IPM relay.
4.4.6 ITM Interface (Terminals 18, 19, 20, 21 & 22)
Figure 4.11: IPM Relay Electrical Connections: ITM
The Insulation Test Module (ITM) is a resistor barrier, which interfaces between the power circuit and
the IPM relay. It also provides a manual and
automatic High Voltage DC „Insulation Test‟. The ITM is
housed in an encapsulated module.
Terminals 20, 21 and 22 provide the voltage measurement feedback for the IPM relay from the power
circuit.
Terminal 19 provides the earth connection between the IPM and the ITM.
Terminal 18 on the IPM is the
„Vtest‟ output of the IPM relay. The IPM will energise this output when
the high voltage DC insulation test is being undertaken, providing a source for the high voltage
generation in the ITM.
4.4.7 RS485 Communications Port (Terminals 23, 24 & 25)
Figure 4.12: IPM Relay Electrical Connections: RS485 Connections
RS485 connections should be wired in screened twisted pair. The screen of the twisted pair cable
should be terminated into terminal 25 of the IPM relay.
4.4.8 Terminal 26
Do not connect. This terminal is unused in this version of the IPM relay.
IPM
Relay
Va
20
Vb
21
22
Vc
A
B
C
Phase Conductors
From Contactor
IT
M
Vcma
Vcmb
Vcmc
Va
Vb
Vc
Flying Leads
0V
19
Vtest
18
Earth
V
TEST
IPM
Relay
23
RS485+
24
RS485-
25
RS485 Common
To RS485 Capable
External Communications
Device (e.g. PLC)