Ampcontrol Pty Ltd
– ABN 28 000 915 542
IPD USER MANUAL
IPDB014 Version 14
– SEP/2020
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 15 of 96
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4.1.6 Frozen/Failed Contactor Protection
The IPD 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 MCI input. The state of the contactor is then
compared to the state of the IPD’s output relay. If the contactor is closed whilst the MCR is in the open
position, a failed contactor trip will be initiated.
The IPD also monitors the voltage on the load side of the outlet’s contactor, via the Cable Connection
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 IPD 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 11.1.
4.2 Accessories
The IPD relay requires a number of accessories to perform its protection functions. These accessories
will be introduced in the following subsections.
Some accessories are marked as optional and are not required for the IPD to perform its basic protection
functions. Purchasing these optional items will, however, expand the capabilities of the installation.
4.2.1 IPD Base Plate
The IPD Base Plate provides a mounting point for the IPD
relay. The base plate is a panel mounted unit and allows the
user to terminate all of the IPD’s control cabling.
The IPD relay plugs into the IPD Base Plate and is secured
there using two mounting screws that are accessible through
the relay’s fascia.
In the event of a fault occurring within the IPD relay, this
design allows the relay to be removed and replaced with
minimal down time.
4.2.2 Cable Connection Modules Type D (CCMD)
The IPD is connected to the outlet’s phase conductors via
a high impedance Cable Connection Module (CCMD).
This allows the IPD to perform an intrinsically safe earth
fault lockout test prior to
the closing of the outlet’s
contactor.
In addition to the intrinsically safe earth fault lockout test,
the CCMD also provides an optional high voltage
insulation test function for the outlet’s power cable.
The IPD also uses the CCMD to monitor the magnitude of
the phase voltages. This is used during the frozen
contactor testing to ensure that when the outlet’s
contactor opens, voltage is removed from the outlet.
