User guide

DIGITMR USER’S MANUAL REV 3
69
5.0 DIGITMR TROUBLE-SHOOTING GUIDE
PROBLEM DESCRIPTION Possible Causes and Suggested Solutions
The DigiTMR will neither trip
nor close the breaker.
• Make sure you hold the “ARM” switch down during each test.
• Check the OPEN or CLOSE fuses.
• Check the initiate leads. For a “Positive Trip” circuit, one Close lead
and one Open lead should be connected to the Positive side of the
power supply.
• Check the initiate leads. For a “Negative Trip” circuit, one Close lead
and one Open lead should be connected to the Negative side of the
power supply.
Message displayed on LCD:
“TRIGGER FAULT”
No Trigger
Using external trigger
• Trigger voltage was not detected by the DigiTMR
• Check the external trigger input to the DigiTMR
• Make sure the external trigger signal is present when the DigiTMR
displays “AWAITING TRIGGER”
No contact time (0 ms) in Trip
or Close test.
• Make sure one side of the breaker is not grounded.
• Make sure the breaker operates on the Open or Close test only. A
dual operation Open-Close or Close-Open will results in a 0ms
reading.
• The DigiTMR contact channels may be damaged or you may have bad
cables. Try the “CHECK HOOK-UP” test. Please see section 3.6.3 for
details.
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, 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 10 ms. The DigiTMR
has a 10ms de-bounce time. Any contact state less than or equal to
10 ms is invalid, thus the delay time is probably too slow.
• Try the Close-Open using the contact channel #1 option
When selecting an Open-
Close test, the breaker opens
but will not close.
• Delay between Open to Close is probably too small. Increase delay
time.
No data or erratic reading on
travel transducer.
• You may have a defective transducer. Try the “TEST TRANSDUCER”
diagnostics test. Please see section 3.6.2 for details.
• Transducer slider is not secured to timing rod.
• Transducer is not secured properly.
No activity on “V2” voltage
input channel.
• The “V2” voltage input channel requires a voltage change from 0V to
above 30V in order to show activity on the timing chart.