NOTICE
Do not use the capacitor disconnect feature if several
frequency converters are connected to the same filter.
4.2.2 Wiring
When wiring, also refer to
.
1.
Connect supply voltage to terminals X1.1, X1.2,
and X1.3.
2.
Connect the frequency converter supply terminals
L1, L2, and L3 to the filter terminals X2.1, X2.2,
and X2.3.
Wiring recommendations for paralleling of frequency
converters
If connecting several frequency converters to 1 harmonic
filter, the connection method is similar to the connection
described above. Connect the supply terminals L1, L2, and
L3 of the frequency converters to the filter terminals X2.1,
X2.2, and X2.3.
NOTICE
Use cables complying with local regulations.
Wiring recommendations for paralleling of filters
If the mains input current of the frequency converter
exceeds the nominal current of the largest harmonic filter,
several harmonic filters can be paralleled to achieve the
necessary current rating, see
.
1.
Connect supply voltage to terminals X1.1, X1.2,
and X1.3 of the filters.
2.
Connect the frequency converter supply terminals
L1, L2, and L3 to the filters terminals X2.1, X2.2,
and X2.3.
4.2.3 Overtemperature Protection
The VLT
®
Advanced Harmonic Filters AHF 005/AHF 010 are
all equipped with a galvanically isolated switch (PELV). The
switch is closed under normal operating conditions. If the
filter is overheated, the switch opens.
Each filter contains 3 thermal switches mounted in series
in each inductor group. At temperatures above 140
°
C
(284
°
F), the switches open.
NOTICE
It is mandatory to use the integrated temperature switch
to prevent damage of the filter caused by overtem-
perature. To prevent filter damage, perform an
immediate stop or a controlled ramp down within
maximum 30 s.
NOTICE
POSSIBLE INSUFFICIENT AIRFLOW
If the switch activates repeatedly, it is probably caused
by insufficient airflow through the filter.
•
Evaluate the airflow and the installation
conditions.
•
Check if the fan inlet or outlet is blocked.
•
Check for defective fan.
•
Check for defective fan control.
4.2.3.1 Programming of Digital Inputs for
Overtemperature Protection
The following describes the most commonly used
programming examples. For more details, refer to
.
Example 1
1.
Connect terminal A of the harmonic filter to
terminal 12 or 13 (voltage supply digital input,
24 V) of the frequency converter.
2.
Connect terminal B to terminal 27.
3.
Program the digital input terminal 27 to
Coast
Inverse
.
If an overtemperature is detected, the frequency converter
coasts the motor and thus unloads the filter.
Example 2
1.
Connect terminal A of the harmonic filter to
terminal 12 or 13 (voltage supply digital input,
24 V DC) of the frequency converter.
2.
Connect terminal B to terminal 33.
3.
Set
parameter 1-90 Motor Thermal Protection
.
4.
Set
parameter 1-93 Thermistor Resource
.
NOTICE
The maximum rating of the temperature switch is
250 V AC and 2 A.
Requirements for Installati...
Design Guide
MG80C602
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Summary of Contents for AHF 010
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