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A3. Testing and troubleshooting
Testing
After installation of the automatic capacitor bank and programming of the switching parameters, the following tests
can be performed depending on load situation.
A. No load or cos = 1 or capacitive load (set desired cos to 0.95 ind.)
1. Select manual mode
2. Add two or more steps.
3. Select automatic mode.
All capacitor steps must be switched off with the programmed delay time between each switching operation.
If all steps are not switched off, check the following:
– Has an inductive load been connected?
– Have the correct C/k ratio and/or step size been programmed?
(It is recommended that the C/k value be set to a value slightly higher than the calculated value)
B. Inductive load
1. Set desired cos =1
2. Select automatic mode.
Capacitor steps will now be automatically switched on to compensate the inductive load (the controller will not switch
steps if the inductive current is lower than the preset C/k value. In such a case, test according to A above).
If all steps are switched on and there is still a demand for additional steps, then check the setting of C/k.
If it is correct, then the bank is too small to compensate the cos = 1. Select a lower value for cos .
When one stage repeatedly switches on and off, it means the C/k is set too low (unless the load actually fluctuates
periodically with a time period equal to or close to the switching delay time).
Troubleshooting
Faults
The controller is connected but does not work
(nothing on display)
The controller does not switch on or off steps
although there is a considerable variable induc-
tive load.
The controller does not seem to activate any
steps.
The preset power factor is not achieved.
All capacitors are switched on although the re-
quired reactive power is relatively low.
After the automatic commissioning stops and the controller displays one of the following messages:
Messages during an automatic commission-
ing process
STATUS
Approved
Recommended actions
Check the voltage setting and the fuses.
Check that the controller is in automatic Mode.
Check setting of phase shift and C/k.
Check that the CT short-circuit bridge is removed.
Wait for the delay time between switching and/or the power out-
age delay time.
At low or no load, a low power factor can correspond to a very
small inductive current. The corresponding capacitor steps are
too large for compensation. If the average cos over a period
of time is too low, the preset cos may be increased.
Check setting of phase and C/k values.
Recommended actions
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PO WER FACTO R CON TR O LL ER RV T
DOCUMENT ID
9AKK107045A9645
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