Vanguard Instruments CT-3500 S2 - Timing a Special OPEN Operation

REV 1.1 CT-3500 S2 USER’S MANUAL
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3.5.6. Timing a Special OPEN Operation
Some special circuit breakers are designed in such a way that two of the dry-contacts follow the
breaker operation while the third contact operates in the opposite direction. For example,
when an OPEN operation is performed, two of the dry-contacts open while the third contact
closes. The CT-3500 S2 offers a special OPEN test that can be used to time such a breaker.
Follow the steps below to perform a special OPEN operation:
a. Start from the “START-UP” menu:
Press the [1] key (TIME BRKR).
b. The following screen will be displayed:
Press the [5] key (SP OPEN).
c. The following screen will be displayed:
Manually initiate an OPEN operation on the breaker.
TEST: OPEN
OPEN BREAKER NOW...
TIMING MODE:
1.OPEN 2.CLOSE
3.OPEN-CL 4.CL-OPEN
5. SP OPEN
1. TIME BRKR 05/16/12
2. GET RSLT 09:55:55
3. SETUP
4. DIAGNOSTICS