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8. Troubleshooting
Most of the APCQ capacitor bank operating issues may be identified with the help of error messages or icons display
on the RVC/RVT controller. Refer to the troubleshooting paragraph of the RVC/RVT controller instruction manual.
APCQ capacitor bank troubleshooting:
At first, in case of problem, strictly respect the safety instructions.
At first check if the capacitor bank rating is in line with network nominal voltage. If not, you cannot connect the capaci-
tor bank.
Step 1: is the RVC/T working or not?
If working, please check the error message and refer to RVC/T manual to understand the problem.
Call HITACHI ENERGY if you cannot fix the problem by yourself.
If not working: open the capacitor bank and make a visual inspection:
– Is the capacitor bank clean and fan working properly? (if not clean and/or replace the fan),
Note: Fans must be replaced after about 40000 hours (check working hours on RVC/RVT).
– Are cables properly connected and yellow marks on terminal OK (if not re-screw them.
Note: at minimum, a yearly maintenance (more frequent if polluted environment).
Note: the capacitors must be checked yearly - replace them if it is below 90% of initial capacitance (phase current).
Step 2: RVC/T is not working:
– Do we have 230V power supply at L2/L3 (RVC) or PS1/PS2 (RVT) terminals?
•
Check if terminal are properly connected and reconnect them if not the case
– If properly connected, check if 230V is available (disconnect the cables and measure the voltage, after reconnect
them)
If 230V is present, then RVC/T is faulty, replace it and check if problem if fixed,
•
•
If no 230V present, and if the thermal switch is open => Then, there is an over-temperature issue:
– Check if fan(s) are OK, replace them if not working,
– Check if the bank is clean and clean it if necessary,
– Check if the air inlet & outlet are clean, clean them if necessary,
– Check if the room is properly ventilated (max temp < 40°C and average temp over 24h < 35°C).
If no 230V and thermal switch is OK but there is no power supply:
•
– Check the auxiliary transformer, if damaged replace it,
– Are the auxiliary fuses OK or not. If not replace the fuses,
– Is the auxiliary tap of the transformer properly set - if not change it to network real value.
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DOCUMENT ID
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AP CQ CAPA CITO R BA NKS
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