35
8. Trouble-Shooting
Pos.
Faults Possible Causes Necessary Action
1 Control relay does not
function, digital display
remains blank.
There is either no voltage or
the wrong voltage has been
applied to the control relay.
Check whether the correct operating
voltage is applied to the control relay.
2 U=0 flashes on the
display.
The voltage applied to the
voltage path of the control
relay is too small.
Check the operating voltage. If the
voltage is correct press the buttons "+",
"-" and "Set" to recognise this voltage
as rated voltage.
3 Relay does not respond
to manual operation
although it has voltage
End of delay time of approx.
10 secs. has not been
observed.
For example , if "1. ON" appears on
the display wait until the control relay
has switched on the first stage.
and digital display is
operational.
Relay was not in manual
mode.
"Man" button must be pressed leading
to flashing of the LED "manual".
4 Stage display
(LED 1-6) lights up but
capacitor contactors
Control circuit is not
connected properly or
there is no control voltage
Check the control circuit according to
the circuit diagram and check fuses.
are not activated There is no neutral on the
contactors.
5 Control relay does not
complete the automatic
identification procedure
Unstable power supply
(power factor fluctuation).
Wait for power supply to stabilize or
manually set c/k factor and mode of
connection.
6 During automatic
adjustment process
Fault in control circuit
(contactors do not switch)
Check control circuit according to the
circuit diagram; check fuses.
"C=0" flashes on the
display.
Fuses of the capacitor stages
are defective or missing.
Check if capacitors are energized after
switching.
Current transformer is in the
wrong place.
Check if the position of current
transformer corresponds to the
circuit diagram.
7 "I=0" flashes on the
display.
Current transformer circuit
interrupted or there is no
current flowing on the
secondary side.
Use ammeter to check current on
secondary side of CT.
(I min >= 0.02A).
The current flowing on the
secondary side of the CT is
too small.
(I min >= 0.02A)
Install smaller current transformer.
Current transformer is
defective.
Check the current transformer.
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