Vanguard CT-7500 - Manual (Page 29)

MODEL CT-7500 OPERATING INSTRUCTIONS
Rev 2 Jan 2001
23
9.1 Timing A Circuit Breaker
Timing Breaker Under Quick-Shot Mode.
The CT-7500 will provide OPEN or CLOSE time only under the Quick-Shot mode. The user
can have the CT-7500 to initiate the OPEN or CLOSE test, in this case the test report will show
OPEN or CLOSE coil current reading and current wave form.
If the user operates the breaker for the Quick-Shot test (using External Trigger), no coil current
reading or wave form will be recorded.
Timing Breaker Under Time-Travel Mode
The CT-7500 will initiate the breaker operation and do a timing test on the following operations:
„ OPEN
„ CLOSE
„ OPEN-CLOSE
„ CLOSE-OPEN
„ OPEN-CLOSE-OPEN
Note
1. The CT-7500 can start OPEN-CLOSE operations, using a programmable delay (between
OPEN and CLOSE commands) or no delay.
2.The CLOSE-OPEN can be started by the CT-7500, using several options:
„ Contact #1 Close:
CT-7500 initiates a CLOSE command then OPEN command after detecting circuit
breaker’s contact closed. The CT-7500 detects breaker contact closed through contact
channel #1.
„ Set DELAY:
CT-7500 initiates a CLOSE command then OPEN command after a programmable
delay (from a CLOSE command).
„ No DELAY:
CT-7500 initiates a CLOSE command and OPEN command together. Since the circuit
breaker is in the open state, the circuit breaker 52B contact allows the close coil to be
energized to start the close command. When the circuit breaker is making the transition
from open state to 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-7500, using a programmable
delay between each of the operations (e.g., delays between OPEN to CLOSE and between
CLOSE to OPEN).