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6 Commissioning (Initial start-up)
DANGER!
To avoid accidents, the following must be observed:
The PQC must be installed in accordance with its intended use before power is
switched on.
All the connectors supplied with the instrument must be plugged in, and the
earth connection must be made.
Before start-up, it must be ensured, for example by means of a closed door or a
suitable cover, that the instrument terminals can no longer be touched.
If the instrument terminals and connecting cables are exposed during opera-
tion, there is a risk of live components being touched inadvertently. The working
voltage may present a hazard to health or may even be life-threatening.
If the above instructions are followed, and the precautions specified in
[Section
1.2, Safety instructions],
are taken, the risk of damaging equipment and assets or
endangering life and limb can be significantly reduced.
6.1 Alarm function
Alarm signals generated internally in the instrument can be assigned to the volt-free contact of
the alarm relay. These alarm signals can comprise status signals, status of the optional digital
inputs, set alarm limits exceeded or instrument faults.
The assignment of the internal PQC alarm signals to the alarm relay is carried out in a menu
dialogue.
[See Section 8.5.3.2, Alarm management]
.
The terminals
Alarm a
and
Alarm b
are connected as shown in the connection diagrams in
[Section 5.7].
Connection diagrams of all PQC instrument types.
[See Section 2, Technical data],
for the contact rating.
6.1.1 List of alarms and messages
cos
·
φ
– alarm
Given if PQC cannot adjust cos
φ
into the control band.
Undervoltage
Given if measured voltage drops below the set limit.
·
Untercurrent
Given if measured current falls below 15 mA.
·
Overcurrent
Given if ratio I
·
rms
/I
50 Hz / 60 Hz
exceeds the set limit.
TDHI
Given if THDI exceeds the set limit.
·
Switching cycles
Given if the number of switching cycles for the capacitors
·
exceeds the set limit.
V harmonic
Given if a harmonic voltage exceeds the set limit.
·
I harmonic
Given if a harmonic current exceeds the set limit.
·
Zero stage (dud) detected
Given if a capacitor stage in operation loses more corrective
·
power than the set limit.
Voltage blackout detected
Given if the power supply is interrupted for longer than
·
x ¼ cycles.