Vanguard CT-7000 S2 - Manual (Page 61)

REV 2 CT-7000 S2 USER’S MANUAL
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3.2.4. Running CT-7000 S2’s in Tandem
Two or more CT-7000 S2’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-7000 S2 with 6
channels (CT-7000-6 S2) and one CT-7000 S2 with 3 channels (CT-7000-3) to create a 9 contact
timing apparatus. Use the steps below to configure the CT-7000 S2’s:
a. Connect the CT-7000-6 S2 to phase A and B of the circuit breaker.
b. Connect the CT-7000-3 S2 to phase C of the circuit breaker.
c. Connect the CT-7000-6 S2’s initiate cable to the breaker control circuit. This unit will
operate the circuit breaker.
d. Connect the CT-7000-3 S2’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-7000-3 S2 using the EXTERNAL TRIGGER option.
f. Run a test from the CT-7000-6 S2 using the INTERNAL TRIGGER option.
The CT-7000-6 S2 will operate the circuit breaker and start the timing sequence. The CT-7000-3
S2 will start its timing sequence as soon as it senses the voltage applied to the breaker coil. The
timing report of the CT-7000-6 S2 will show the contact time of phase A and B. The timing
report of the CT-7000-3 S2 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.
Figure 18. Typical Initiate and Trigger Connections for Operating Two CT-7000 S2's in Tandem