Technical Manual
Page 10
ISSUE 7 28/9/99
P&B Engineering
6.2.17. Isolator (56,57)
This input enables the to determine if the motor starter is in the isolated or service (available) position.
With the N/O input open and the N/C input closed the motor starter is isolated and cannot be started. A changeover of
both these contacts indicate the motor is in the service position and can be started. Changing of one or both of the
contacts while the motor is running will result in the immediate stopping of the motor.
6.2.18. External Fault 2 (52)
This inputs allows for tripping or alarming of external protective devices or interlocks. When closed the fault is
healthy and when opened a trip and/or alarm occurs depending on the Tripping/Alarm settings. Auto-Reset when
enabled, occurs when the input contact closes.
6.2.19. External Test Position (53)
This feature can be provided as an alternative to the External Fault 3 input by means of a change in internal dip switch
settings prior to leaving the factory. The default setting is for this input is 'External Fault 3'. If required to be changed
on site, switch 1 , at the far right of the dip switch block situated on 2nd pcb from the top, i.e. with no connectors,
should be set to 'On' to provide the External Test facility, if set to 'Off' the input is used for External Fault 3.
If this option is selected a facility is provided to carry out function and protection testing on the motor starter provided
the starter is isolated. When this option is selected the Logical Input/Contact Status page will display in place of the
External Fault 3 the External Test status and will indicate 'Open = Run Enable' or 'Closed = Test' messages.
The Closed = Test status will only be achieved providing the Isolator N/O and N/C contacts confirm that the starter is
in the isolated position.
When in the Test mode the will ignore the Plant Interlock input and will disable Undercurrent Alarm &
Trip, Undervoltage, Single Phase and Phase Sequence protection functions to allow full functional testing to be
performed without the need for voltage or current injection and will allow secondary injection testing to be carried out
on all protective functions except for those disabled by the feature. If the External Test feature is required this should
be specified on the purchase order.
6.2.20. External Fault 3 (53)
As an alternative to the External Test input these terminals can be used to allows for tripping or alarming of external
protective devices or interlocks. When closed the fault is healthy when opened a trip and/or alarm occurs depending
on the Tripping/Alarm settings. Auto-Reset when enabled, occurs when the input contact closes. This requirement
should be specified at the time of order placement
6.2.21. Emergency Stop (54)
This input allows the to monitor the status and provide indication of the state of any of the external
Emergency Stop buttons which are normally directly wired to the contactor closing circuit. Opening of the input
causes a trip or alarm depending on the Tripping/Alarms Settings.
Summary of Contents for MPC2000+
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