Trinity ACCUVAR, Руководство пользователя, Страница: 25 / 27

pg. 25
TRINITY
ACCUVAR - Operational Manual
(B). Troubleshooting 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:
•
The CTs are located only on the Load bus, and capacitor current is not passing through
the CTs. Change the location of the CTs to the true main Incomer.
•
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 reconfiguration 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.