Vanguard CT-7000 - Manual (Page 26)

CT-7000 Operating Instructions
19
9.1 Timing a Circuit Breaker
The CT-7000 will initiate the breaker operation and do a timing test on the following
operations:
n OPEN
n CLOSE
n OPEN-CLOSE
n CLOSE-OPEN
n OPEN-CLOSE-OPEN
NOTE
1. The CT-7000 can start the OPEN-CLOSE operations without a delay or by using a
programmable delay between the OPEN and CLOSE commands.
2. The CLOSE-OPEN can be started by the CT-7000, using several options.
n Contact #1 Close
The CT-7000 can initiate a CLOSE command and then an OPEN command after
detecting the breaker’s contact was closed. The CT-7000 detects that the
breaker’s contact was closed through contact channel #1. The selection is
recommended for the CLOSE-OPEN operation since it truly represents when the
circuit breaker closed and then opened.
n Set DELAY
The CT-7000 can initiate a CLOSE command and then an OPEN command after
a programmable delay that can be set in milliseconds.
n No DELAY
The CT-7000 can initiate a CLOSE command and then an OPEN command
without any delay. Since the circuit breaker is in the open state, the circuit
breaker’s 52B contact allows the close coil to be energized, which can start the
close command. When the circuit breaker is making the transition from an open
state to a close state, the 52A contact will close allowing the breaker to initiate the
open command.
3. The OPEN-CLOSE-OPEN operations can be initiated by the CT-7000, by using a
programmable delay between each of the operations, where the delays can be set
between the OPEN to CLOSE and between the CLOSE to OPEN commands.