Vanguard CT-7500 - Manual (Page 67)

MODEL CT-7500 OPERATING INSTRUCTIONS
Rev 2 Jan 2001
61
11.0 CT-7500 Trouble Shooting Guide
Problems Suggestion
1. CT-7500 will not trip or close breaker. „ Make sure you hold the “ARM” switch down during
test.
„ Check OPEN or CLOSE fuses.
„ Check initiate leads. For a “Positive Trip” circuit,
one Close lead and one Open lead should be
connected to the Positive of the power supply.
„ Check initiate leads. For a “Negative Trip” circuit,
one Close lead and one Open lead should be
connected to the Negative of the power supply.
2. No contact time (0 ms) in Trip or Close test. „ Make sure one side of breaker in not grounded.
„ Make sure the breaker operates on OPEN or Close
test only. A dual operation OPEN-CLOSE or CLOSE-
OPEN will resulting in 0ms reading.
„ Bad CT-7500 contact channels or bad cables. Try
“CHECK HOOK-UP” test.
3. No contact time (0 ms) in Close-Open. „ Make sure breaker contacts complete the transition
from Open (initial state) to Close then Open (final
state). You can see this transition by looking at the
timing chart.
„ Make sure the contact close state is longer than
10ms. The CT-7500 has a 10ms de-bounce time, any
contact state less than or equal to 10ms is invalid.
If you have this problem, your delay time is probably
too slow.
„ Try Close-Open using contact channel #1 option.
4. Select Open-Close test. The breaker opens and will
not close. „ Delay between Open to Close is probably too
small. Increase delay time.
5. No tabulated and timing chart for contact channels
above #3. „ The CT-7500 always defaults to contact channels
1,2 and 3. You need to turn on contact channels
above 3.
6. No tabulated or timing chart for travel 2 and 3. „ Turn on travel channel 2 and 3.
7. No data or erratic reading on travel transducer. „ Bad transducer. Try “TRANSDUCER” test.
„ Transducer slider is not secured to timing rod.
„ Transducer is not secured properly.
8. No activity on V2 voltage input channel. „ The V2 voltage input channel requires a voltage
change (0v to above 30v) to see activities on the
timing chart.