Slow-Close Test - Vanguard Instruments CT-7500 Operating Instructions Manual

MODEL CT-7500

9.18 Slow-Close Test

The CT-7500 offers a unique feature called a "slow-close" test. This test lets users measure
the distance of a breaker's contact travel from fully opened position to contact "touch" position and
contact wipe (or penetration) distance. This test requires the operator manually jack the breaker's
contact from the fully open position to the fully closed position.
Contact channel 1, 2, 3, and transducer channel 1 will be used for this test. The CT-7500 will
measure the contact touch and contact wipe (penetration) of each contact channel.
Contact touch is the distance measured from contact fully open to the first position contact
channel electrically closed.
Contact wipe (or penetration) distance is measured from the contact position first electrically
closed to the final closed (latching) position.
STEP OPERATION
1 SELECT DIAGNOSTIC MENU.
2 SELECT SLOW CLOSE TEST.
3 START SLOW CLOSE TEST.
4 CONTINUE TO CLOSE BREAKER.
5 RETURN TO MENU.
The user can also save a slow-close test report in EEPROM. A typical report of a slow-close test
is shown on next page.
Table 9-19. Performing a Slow-Close Test
ACTION
PRESS # 4 KEY.
PRESS # 1 KEY.
PRESS "ENTER" KEY.
NO ACTION.
NO ACTION.
Notes
OPERATING INSTRUCTIONS
1. SLOW CLOSE TEST
2. PRINT DATA
3. TEST TRANSDUCER
4. CHECK HOOK UP
BREAKER SLOW CLOSE TEST
RMV CB GND (1 SIDE)
"ENTER" TO BEGIN
CONTACT 1:OPEN
CONTACT 2:OPEN
CONTACT 3:OPEN
LIFT TO CLS BREAKER NOW
LIFT BRKR TO CLS POS
THEN PRESS "ENTER"
TO FIND CONTACT WIPE
1. TIME BRKR
2. GET RSLT
3. SET UP
4. DIAGNOSTIC
56
DISPLAY
Rev 2 Jan 2001