Vanguard CT-8000 - Manual (Page 64)

CT-8000 USER’S MANUAL REV 2
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3.3.4. Running CT-8000’s in Tandem
Two or more CT-8000’s can be used to time a circuit breaker in cases where more than 6 timing
contact channels are required. A typical application is to use one CT-8000 with 6 channels (CT-
8000-6) and one CT-8000 with 3 channels (CT-8000-3) to create a 9 contact timing apparatus.
Use the steps below to configure the CT-8000’s:
a. Connect the CT-8000-6 to phase A and B of the circuit breaker.
b. Connect the CT-8000-3 to phase C of the circuit breaker.
c. Connect the CT-8000-6’s initiate cable to the breaker control circuit. This unit will
operate the circuit breaker.
d. Connect the CT-8000-3’s external trigger cable to the OPEN coil for the OPEN test and
CLOSE coil for the CLOSE test. This unit will operate as a slave device.
e. Start running a test from the CT-8000-3 using the EXTERNAL TRIGGER option.
f. Run a test from the CT-8000-6 using the INTERNAL TRIGGER option.
The CT-8000-6 will operate the circuit breaker and start the timing sequence. The CT-8000-3
will start its timing sequence as soon as it senses the voltage applied to the breaker coil. The
timing report of the CT-8000-6 will show the contact time of phase A and B. The timing report
of the CT-8000-3 will show the contact time for phase C. If the results are downloaded to a PC
using the included software, the two reports can be combined to generate a 9-channel test
report.