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
7.5.2 Frozen Contactor
Table 14: Protection Element – Frozen Contactor 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
When outlet is not running
AS/NZS 2081:2011 Clause 9.2.2 states that the MC’s auxiliary interlocks must be in agreement with the
control signals being sent to the MC, else tripping of the upstream CB shall commence.
Frozen contactor detection is while the MCR is open. If the Protection Element detects that the main
contactor has closed (or remains closed after the MCR is opened for any reason), it will result in a frozen
contactor trip.
The frozen contactor protection activates in approximately 100ms.
7.5.3 Close Fail
Table 15: Protection Element – Contactor Close Fail 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
After closing MCR, prior to receiving confirmation from the MCI
AS/NZS 2081:2011 Clause 9.2.2 states that the MC’s auxiliary interlocks must be in agreement with the
control signals being sent to the MC, else tripping of the upstream CB shall commence.
Close fail detects the event when the Protection Element attempts to close the output by closing its MCR
output, but receives no confirmation of the close output contactor via the MCI digital input.
Close fail protection activates in approximately 1sec.
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