Ampcontrol OCS - Cassette Isolation & Earthing (OCS Only)

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
Page 28 of 72
APPROVED FOR EXTERNAL DISTRIBUTION
– PROPERTY OF AMPCONTROL PTY LTD
– NOT TO BE REPRODUCED IN PART
Load Parameter Name
Description
Under Voltage Trip Level
Selects the trip level for or disables under voltage protection
Back EMF Time
Selects the back EMF timer period which inhibits loss of
vacuum detection after the outlet is opened.
’*’ - Setting is not available in the Residual Voltage Protection Element version.
’**’ - Setting is only available in the Residual Voltage Protection Element version.
*** - This setting is only used for series EC protection in the Residual Voltage Protection Element
version.
****’ - Setting is only available in the Residual Voltage Protection Element version. Controls the Shunt
Trip Time and the Open Circuit (>100Ω) Trip Time.
6.6 Time and Date
The time and date are used only to time stamp the events in the log (which are recorded sequentially
regardless of the time and date). The time and date are not used for any control functions.
6.7 Cassette Isolation & Earthing (OCS Only)
Through the use of remotely controlled actuators, the OCS allows individual Outlet Cassettes to be
moved between the service and earth positions. This provides both a break between the outlet phase
conductors and the incoming supply, as well as visual earthing of the outlet cable without the
requirement of a separate earthing outlet.
Each Cassette houses the line and load contacts, vacuum contactor, three current transformers, Earth
Leakage CT and the Protection Element. The cassette is driven between the service and earth positions
by an electrically driven actuator. When in the service position the cassette is connected to the line and
load contacts with the on-board vacuum contactor switching the outlet. In the earthed position the
cassette is disconnected from the line bus and connects the load connections to earth. These earth
contacts are visible through viewing windows.
When in the earth position the supply to the actuator can be externally isolated to prevent operation to
move the cassette away from the earth position.
6.7.1 Actuator
Actuators are used to transition the cassettes between the service and earth positions. The actuator is
controlled via PLC outputs and provides ‘actuator healthy’ feedback to the PLC. An analogue input
corresponding with the position of the actuator rod is compared with the state of the limit switches by
the PLC to indicate the position of the cassette.
NOTE
Each actuator has a coloured band on each end of the cable to
denote actuator position within the chassis (as shown in Figure 6.1).
Non matching colours will prevent operation of the actuator.