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 13 of 83
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3.1.1 Earth Leakage Protection
The IPM monitors the outlet‟s earth leakage current through the use of an approved core balance
toroid. A Residual Current Device (RCD) operating characteristic is provided with adjustable trip
sensitivity and time delay. When a trip is initiated, the IPM will open its MCR output relay, opening the
outlet‟s contactor.
For detailed information on the operation of the Earth Leakage protection function, refer to Section 6.1.
3.1.2 Earth Continuity Protection
The Earth Continuity function tests for the continuity of the earthing between the outlet and the
machine, via the pilot core in the trailing cable. The pilot core is also used to transfer data when a
Remote Termination Module (RTM) is used to achieve machine communication.
For detailed information on the operation of the Earth Continuity protection function, refer to Section
6.3.
3.1.3 Insulation Testing
The insulation testing function tests the resistance of the 3 phase lines to earth by applying a high
voltage DC signal to the phase conductors, via the Insulation Test Module (ITM). This test is initiated
once all starting conditions are met.
If the result of the Insulation Test is above the pre-
set resistance level, the IPM‟s MCR relay energises,
which in turn closes the main contactor. A manual “Insulation Test” is also provided as a
maintenance/fault finding tool. (When this test is performed the MCR relay does not close at completion
of a healthy test). The Insulation Test allows cable insulation levels to be trended as an aid to
preventative maintenance.
For detailed information on the operation of the Earth Fault Lockout protection function, refer to Section
6.2.
3.1.4 Frozen / Failed Contactor Protection
The IPM relay provides failed contactor protection, initiating a back-trip to an upstream circuit breaker if
the contactor is deemed to have failed to open when required. The position of outlet‟s contactor is
monitored via the Main Contactor Input (MCI). The state of the contactor is then compared to the state
of the IPM‟s output relay. If the contactor is closed whilst the MCR is in the open position, a failed
contactor trip will be initiated.
The IPM also monitors the voltage on the load side of the outlet‟s contactor, via the ITM module, whilst
the contactor is in the open position. If this voltage exceeds 10% of the rated line voltage, a failed
contactor trip will be initiated. When a trip is initiated, the IPM will open its CBR output relay, opening
the upstream circuit breaker.
For detailed information on the operation of the Frozen/Failed Contactor protection function, refer to
Section 8.1.
3.1.5 Overcurrent / Overload Protection
The IPM relay monitors the outlet phase currents via three current transformers (CTs). The measured
current allows the IPM to implement overcurrent, thermal motor overload and phase imbalance
protection. When a trip is initiated, the IPM will open its MCR output relay,
opening the outlet‟s
contactor.
For detailed information on the operation of the Overcurrent and Overload protection functions, refer to
Section 0.
3.1.6 Short Circuit Protection
In addition to the overload protection functions, the IPM relay uses the currents measured from the
three phase CTs to provide short circuit protection. The IPM opens its CBR output when a short circuit