NEWTON+ – Operational Manual
TRINITY
[22]
(B) Trouble Shooting Guide
(Read carefully section (A). Troubleshooting as before)
1. Relay is dead. Check that the specified voltages are available at the voltage
terminals of the Relay. Do not check with a neon tester. Use a multi-meter and
check physically the voltages available at the R-Y, Y-B and B-R terminals. If the
voltages are available and the Relay is dead, the Relay in all probability is
defective. Please send it back for repairs.
2. Relay does not indicate expected power factor. Your wiring is wrong. Change
around the wires leading to the R,Y,B voltage terminals of the Relay. There are
six combinations, and only one of them is correct. Try all six. Also check that your
expected power factor estimate is reasonably correct.
3. Relay switches the capacitors on, but the power factor does not improve
The source of this fault could be:
a. The CT is located only on the Load bus, and capacitor current is not passing
through the CT. Change the location of the CT to the true main Incomer.
b. The capacitors are all defective. This seemingly unlikely fault has occurred at
many sites. Measure the current in each lead of each capacitor as it switches
on, to check. This would also reveal if all the fuses of all the capacitors have
blown.
4. Relay switches on all the capacitors, the power factor improves, but does
not reach the set value. At the extreme is the possibility that the total installed
KVAR is too low. In this case, the Relay switches on all the capacitors but the
power factor does not improve to the set value. Check if the capacitors are
healthy. Remedy is to add capacitors and add stages. This may need total re-
configuration of the panel wiring.
5. Relay switches on the contactors but does not switch them off, though
indication on the Relay is correct. All contactors switch off simultaneously
when the last switch off occurs. Your external Manual Control is not configured
correctly. The contactors are latching up through their holding contacts. Extensive
rewiring is required to remedy this fault. This is also possible if 440 VAC coils
have been used.
6. Relay is on but PF meter indicates 1.0 always. The current through the Relay is
inadequate.
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