Power Factor Controller L&T PFC-8

This is just a guide to assist with your problem on your PFC-9 Unit.

I've had similar problem and had relocated the C.T to the line side of the ATS (utility supple side), and reconfirm the C.T program settings at the controller. After which the unit was commissioned.

1. Do you a manual of the PFC-8 Unit?

2. Has an error massage appeared on the PFC-8 Unit's Controller?

If there is an error massage, check out the error at the "Trouble Shooting" page for remedy actions.

3. No voltage at o/p pins 1,2,3,4,5,6 indicates that the PFC-8 Unit controller is not switching their respective internal relay on.

PFC Unit controllers continuously monitors loading, and will switch on the internal relay of respective cap banks to energize the cap contactors engaging the cap banks into service. The number of cap banks coming into service depends on the loading magnitude, for power angle to be corrected to the set power factor. Cap banks are switched into service via a set electrical stepping sequence. Your controller will have a number of specific stepping sequences for 8 steps.

4. Check the C.Ts and the V.Ts if they are good, lose connection. Check if the meters are reading voltage, current, kw, and kva from your system loading. Check that jumper connections at the C.T terminal block is correct. Check that C.Ts are connected correctly in regards to polarity.

PFC Unit controllers depend on the C.Ts and V.Ts for loading data to determine the loading angle and the correction factor to maintain the set power factor, by which it engages cap banks via the o/p switches.

5. Check the PFC Unit controller settings, for all correct parameter settings.

a. Set power factor requirement is as required.

b. Correct Wiring configuration is set.

c. THD Limit

d. Electrical Stepping Sequence.

e. C.T ratio setting; controller will be unable to operate on excessive loading if C.T is oversized.

f. Metering Functions.

g. Thermal Control Setting, temperature limit.

Also as maintenance,

6. Check other hardware.

a. PFC Controller circuit breaker is good.

b. Terminal fuses between o/p terminals of controller and cap bank contactors coils, if there exists a fuse type terminal block.

c. Check contact coils.

d. Check cap bank fuses, remember to isolate unit.