Owner's manual

REV 2 CT-7500 S2 USER’S MANUAL
92
4.5 Troubleshooting Guide
PROBLEM DESCRIPTION Suggested Solution
CT-7500 S2 will neither trip nor
close the breaker.
• Make sure you hold down the [ARM] switch during each test.
• Check the OPEN or CLOSE fuses.
• Check the initiate leads.
o For a “Positive Trip” circuit, one CLOSE lead and one OPEN lead
should be connected to the positive side of the power supply.
o For a “Negative Trip” circuit, one CLOSE lead and one OPEN lead
should be connected to the negative side of the power supply.
Getting following message when
using external trigger:
• Trigger voltage was not detected by the CT-7500 S2.
• Check the external trigger input to the CT-7500 S2.
• Make sure the external trigger signal is present when the CT-7500 S2
displays the “AWAITING TRIGGER” message on the screen.
Missing timing or transducer
channels on report and graphic
output.
• Timing or transducer channels were not turned on. See section
3.1.15 for instructions on how to turn on the contact and transducer
channels.
No contact time (0 ms) in Trip or
CLOSE test.
• Make sure only one side of the breaker is grounded.
• Make sure the breaker operates on the OPEN or CLOSE test only. A
dual operation OPEN-CLOSE or CLOSE-OPEN will result in a 0ms
reading.
• The CT-7500 S2 contact channels may be damaged or the cables
may be bad. Try the “Check Hook-UP” test (see section 4.3).
No contact time (0 ms) in CLOSE-
OPEN test.
• Make sure the breaker contacts complete the transition from the
OPEN (initial state) to the CLOSE state, then to the OPEN (final state).
You can see the transition by looking at the timing chart.
• Make sure the contact CLOSE state is longer than 10ms. The CT-7500
S2 has a 10ms de-bounce time so any contact state less than or
equal to 10ms is invalid.
• Try the CLOSE-OPEN test using contact channel #1.
When performing an OPEN-CLOSE
test, the breaker opens but will
not close.
• Delay between OPEN to CLOSE is probably too short. Increase the
delay time.
TRIGGER FAULT
NO TRIGGER