Reference Manual
BLR-CM/BLR-CM3phase
Rev. 08
2018-09
40
5 Trouble shooting
Problem
Possible cause
Approach
no display
auxiliary voltage missing
check correct connection of auxiliary voltage, if neces-
sary rectify
display "U<>LIMIT"
measurement voltage out of
range
wrong settings for voltage
measurement
check correct connection of measurement voltage, if
necessary rectify
check settings in menu "SETUP / MEASUREMENT", if
necessary rectify
display "I<LIMIT"
measurement current too small check connection of CT, probably there is a break in the
line
CT ratio too high, if necessary replace CT
remove short circuit link of the CT
wrong display of cur-
rent or voltage
wrong transformer ratio
setting of Q offset
check settings PT- or CT-ratio in menu "SETUP /
MEASUREMENT", if necessary rectify
correct setting of Q offset
wrong power factor is
displayed
wrong settings at the regulator
setting of Q offset
check settings "NOMINAL VOLTAGE" and
"CONNECTION" in menu "SETUP" and setting "PHASE
COMPENSATION" in menu "EXTENDED", if necessary
rectify
correct setting of Q offset
power factor doesn't
change after switching
on a step, step is
switched off again
CT mounted in wrong position
check mounting position referring circuit diagram (cur-
rent of load and capacitors have to be measured!), if
necessary rectify
alarm "overcurrent"
current higher than allowed
check CT ratio, probably replace by suitable transformer
type
alarm "control"
permanent overcompensation
permanent undercompensation
check settings
check contactors, probably contact stick together
check settings
check capacitors, possibly fuse defective
check dimensioning of the compensation unit
reversed control mode current or voltage clamps inter-
changed
correct connection or adapt phase compensation
single steps are not
switched on or off
wrong settings
check, if referring steps are defined as fix steps (perma-
nently on or off)
steps are detected as
defective
step defective
check capacitor steps, probably fuse, capacitor or con-
tactor defective
steps are not switched
on
step size too large
necessary reactive power smaller than switching thresh-
old of step size of the smallest step
regulator still doesn't
work proper
contact Beluk
