Owner's manual

CT-7500 S2 USER’S MANUAL REV 2
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3.2 Performing Circuit Breaker Timing Tests
The CT-7500 S2 can initiate the breaker operation and perform a timing test on the following
operations:
• OPEN
• CLOSE
• OPEN-CLOSE
• CLOSE-OPEN
• OPEN-CLOSE-OPEN
The CT-7500 S2 can start the OPEN-CLOSE operations without a delay or by using a
programmable delay between the OPEN and CLOSE commands.
The CLOSE-OPEN operation can be started by the CT-7500 S2 using several options:
• Contact #1 CLOSE
The CT-7500 S2 can initiate a CLOSE command and then an OPEN command after
detecting the closing of the breaker’s contact. The CT-7500 S2 detects the closing of the
contact through contact channel #1. This option is recommended for the CLOSE-OPEN
operation since it truly represents when the circuit breaker closed and then opened.
• Set DELAY
The CT-7500 S2 can initiate a CLOSE command and then an OPEN command after a
programmable delay set in milliseconds.
• No DELAY
The CT-7500 S2 can initiate a CLOSE command and then an OPEN command without any
delay. Since the circuit breaker is in the OPEN state, the 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.
The OPEN-CLOSE-OPEN operation can be initiated by the CT-7500 S2 by using a programmable
delay between each of the operations. The delays can be set between the OPEN to CLOSE
commands and between the CLOSE to OPEN commands.