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6.3.1 Power Factor Alarm
If the threshold values set for "switch-on"
and "switch-off" are exceeded and no fur-
ther change can take place in the output
stages, the alarm signal functions (except
for the cos-phi alarm being switched-off;
see mode -23-). By pressing the "Set"
button the amount of capacitive and
reactive power missing to reach the target
power factor flashes on the display.
Pressing the "Set" button again shows the
actual power factor on the display and the
alarm marker "Power Factor" no longer
flashes.
6.3.2 Harmonic Alarm
When the programmed threshold values
are exceeded the alarm goes off.
By pressing the "Set" button several times
the display shows the order and the
maximum values of the exceeded
harmonics starting with the maximum
deviation.
The button "Set" must be pressed
repeatedly until the "Harmonic" alarm no
longer flashes.
6.3.3 Over-current alarm
If the ratio between the actually measured
RMS current and the nominal current of
the capacitor has exceeded the pro-
grammed value for one minute, the alarm
goes off and all stages are switched off.
After the alarm has been acknowledged it
takes approx. 4 minutes until the neces-
sary capacitor stages are switched on
again.
By pressing the "Set" button the display
shows the maximum value of the factor by
which the RMS current has exceeded the
nominal current.
By pressing the "Set" button again the
display shows the actual power factor and
the alarm marker "Ampere" no longer
flashes. (See also section 5.23, page 28)
Notice:
The over-current ratio is a mathemati-
cally determined value and therefore
cannot be applied to filtered systems.
6.3.4 Operating-Cycles Alarm
If a stage exceeds the set limit for number
of operating cycles, the number of the
stage that has exceeded the limit blinks in
the display about every 10 seconds (e.g.
“ ” for the sixth stage). An alarm
signal is also sent. Section 5.15 describes
how this alarm signal is cancelled.
6.3.5 "U=0" Alarm
If there is an interruption in the measure-
ment voltage path, the control relay
switches off all stages after about 1 sec.
and displays "U=0".
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