8.0 TROUBLE SHOOTING
FAULT
POSSIBLE CAUSE
SUGGESTED REMEDY
No indication in
the display
No power supply to terminals
UM1-UM2
Check for voltage in the range 90-550v 50/60hz on
these terminals
Display shows
U
ALARM
Power supply is outside voltage
tolerance setting.
Check the setting entered on menu 201 and 204
Display shows
I
LO
Measured Current is below 15mA
Check CT circuit. Are summated CT’s in opposition? Has
short circuit link been removed? Is CT circuit broken?
Display shows
wrong value of
Voltage or
Current
Incorrect CT or VT ratio has been
submitted
Check settings of VT and CT. Remember the settings
are :1 so a 1000/5 CT = setting of 200
Display shows
wrong value of
Power Factor
Capacitor Step Size has not been
recognised, or phase angle setting has
been wrongly entered in 206
Start Ai in the set up menu, Check the setting of phase
angle in 206 and rectify if necessary
Power factor does
not improve after
stepping steps in.
Steps won’t
switch out
CT in wrong position – see notes 1.2 of
these operating instructions.
Check position of CT ensure it is measuring total
current including capacitor current and if split core
make sure the gap is fully closed up.
Display shows
I Hi
ALARM
Output from CT is too high – above 5
amps.
Check the CT ratio selected. Change if necessary
Display shows
PFC
ALARM
Continuous over compensation or
continuous under compensation
Check the capacitors and contactors.
Contactor could be welded in. Check that steps are not
in the FON setting
( PFC /Out in menu 100 )
Is the kvar supplied sufficient for the reactive demand?
If not under compensation will be reported
Display Shows
Leading
Cosphi....c
When you know
there is lagging
load
Voltage or current connections wrong
way around.
Phase angle incorrectly entered
( 206)
Switch off and swap over Um1 and Um2 ( This is better
than swapping over the CT connections since voltage
surges form open circuit CT are avoided)
If necessary check settings of 206
Certain steps
don’t switch in or
out
Wrong selection on the OUt menu
Check to see if some steps have been set as FON or
FOFF ( permanently on or off ) instead of AUTO
Steps are shown
as defect.,
FLTY
.
Capacitor step faulty or fuse or
contactor has failed
Check capacitor current with clamp on power meter
and compare with rated current are fuses and
contactor operating correctly? Replace as required.
Steps won’t ever
switch in,
but there is
nothing wrong
with them
Capacitor step sizes are too big.
Provide more steps of lower kvar per step
EXPORT shows in
the display but
there is no export.
CT reversed
Swap over Um1 /Um2 to correct.
Alt the Ai feature has caused this to show. Defeat Ai by
setting 208=NO
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