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 40 of 83
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8
VOLTAGE RELATED FUNCTIONS
The IPM relay uses the Insulation Test Module (ITM) to monitor the magnitude of the voltage on the load
side of the outlet‟s main contactor. The voltage measurement is used to implement the following
functions:
Main Contactor Fail Protection
Undervoltage Trip
Voltage Metering
Figure 8.1: IPM Voltage Monitoring Connections
8.1 Main Contactor Fail Protection
The Main Contactor Fail (MCF) protection operates if the Main Contactor (MC) fails to function by either:
1. Failing to open when required. This is achieved by comparing the state of the main contactor (via
the Main Contactor Input MCI) against the state of the MCR relay output. This test provides
“Frozen Contactor Protection”.
2. Failing to maintain insulation across the contacts when the contactor is open. The Insulation Test
Module (ITM) is used to measure the voltage on the load side of the contactor. If this exceeds
10% of the rated line voltage, a trip will occur. This test provides
“Loss of Vacuum Protection”.
This function is inhibited immediately after the main contactor opens to allow for back EMF
voltages generated by some motors to dissipate. The inbuilt ti
me is selected via the „back EMF
time‟ setting (Level 6, Screen 20). The settings are adjustable from 2 to 20 seconds.
A main contactor fail trip operates the CBR relay, which trips the circuit breaker.
To reset the relay following a main contact failure trip, operate the reset key/digital input.
The status of the MCI input ca
n be viewed on the „IPM Relay and Keys‟ screen, (Level 4, Screen 2).
8.2 Undervoltage Trip
The undervoltage protection is enabled as soon as the main contactor is closed (indicated by closing the
MCI input). If any of the phase voltages drop below the selected trip setting of the nominal line voltage
for 800ms then the MCR relay is de-energised.
To reset the relay following an undervoltage trip, operate the reset key/digital input.
The trip level is selected via the „U/V Trp level‟ setting (Level 6, Screen 19) and is adjustable between
40, 50, 60, 70, 75, 80, 85, 90, 95 & OFF
. Setting the trip level to „OFF‟ disables this function.
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