Ampcontrol Pty Ltd – ABN 28 000 915 542
OCS USER MANUAL
MAG-182 Version 5 – FEB/2020
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
APPROVED FOR EXTERNAL DISTRIBUTION
– PROPERTY OF AMPCONTROL PTY LTD
– NOT TO BE REPRODUCED IN PART
7.5.4 External Open
Table 16: Protection Element – External Open Trip Characteristics
Communication reset or physical reset after a trip. The physical reset
button is found on the front cover of the Protection Element
Open Circuit Breaker
Prevent Main Contactor from closing
An External Open trip occurs if the main contactor is detected as having been opened while the system
is in run mode.External open protection activates in approximately 1sec.
7.5.5 Coil Voltage Detection
Table 17: Protection Element – Coil Voltage Detection Trip Characteristics
Open Circuit Breaker
Prevent Main Contactor from closing
Only logged if it results in the Protection Element stopping a running
outlet
The coil voltage is internally detected by sensing the voltage across terminals 12 & 13 (COIL-SUPPLY-1
& COIL-SUPPLY-2). This additional functionality is provided so in the event of the Contactor coil voltage
being lost while the outlet is running a nuisance Main Contactor Failure trip does not occur, as the
changing of state for the Main Contactor can be explained by the loss of coil voltage.
7.5.6 MCF Latch
AS/NZS 4871.1 Clause 2.6.3.6 requires contactor related trips to be reset only by an authorised person.
To this end it is deemed that physical access inside the switchgear enclosure would be required to
perform the relevant checks, and as such the Main Contactor Failure can be reset by the push-button on
the Protection Element or alternatively over comms. All trip bits that feed into the Main Contactor Failure
Flag are individually logged in the Protection Element for event analysis in the instance of a Circuit
Breaker Trip.
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