Vanguard CT-7000 - Manual (Page 70)

CT-7000 Operating Instructions
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9.23 Running CT-7000 in Tandem
For timing application requiring more than 12 timing contact channels, the user can use two or
more CT-7000s to time a circuit breaker. A typical application is to use a CT-7000-12 and a CT-
7000-6 to time a 18-contact ATB. To time this circuit breaker, the user can use the following
steps:
n Connect the CT-7000-12 to phase A and B of the circuit breaker.
n Connect the CT-7000-6 to phase C of the circuit breaker.
n Connect the CT-7000-12 initiate cable to the breaker control circuit. This CT-7000-12
will operate the circuit breaker.
n Connect the CT-7000-6 external trigger cable to the OPEN coil for the OPEN test and
CLOSE coil for the CLOSE test. This CT-7000-6 will operate as a slave device.
n Set the CT-7000-6 to start a test using “EXTERNAL TRIGGER”.
n Set the CT-7000-12 to start a test using “INTERNAL TRIGGER”.
n Press “START” key on the CT-7000-6 to start the sequence the press the “START” key
and hold the “ARM” switch on the CT-7000-12.
The CT-7000-12 will operate the circuit breaker and start the timing sequence. The CT-7000-
6 will start its timing sequence as soon as it senses the voltage applied to the breaker coil.
The timing report of the CT-7000-12 will show the contact time of phase A and B. The timing
report of the CT-7000-6 shows contact time for phase C.
If the user downloads the test results of both the CT-7000s to the PC, the user then can
combine the 2 test reports to generate a 18 channel test report. This report now can be printed on
the PC printer.