P74x/EN OP/N
(OP) 5-
be necessary to use the breaker 52A and/or 52B contacts via PSL. If no CB auxiliary
contacts are available no CB control (manual or auto) will be possible.
Once a CB Close command is initiated the output contact can be set to operate following a
user defined time delay (‘Man Close Delay’). This would give personnel time to move away
from the circuit breaker following the close command. This time delay will apply to all manual
CB Close commands.
The length of the trip or close control pulse can be set via the ‘Man Trip Pulse’ and ‘Man
Close Pulse’ settings respectively. These should be set long enough to ensure the breaker
has completed its open or close cycle before the pulse has elapsed.
Note: The manual close commands for each user interface are found in the
System Data column of the menu.
If an attempt to close the breaker is being made, and a protection trip signal is generated,
the protection trip command overrides the close command.
If the CB fails to respond to the control command (indicated by no change in the state of CB
Status inputs) a ‘CB Fail Trip Control’ or ‘CB Fail Close Control’ alarm will be generated after
the relevant trip or close pulses have expired. These alarms can be viewed on the relay LCD
display or can be assigned to operate output contacts for annunciation using the relays
programmable scheme logic (PSL).
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