Instructions For Operation And Use; Basic Information; Frequency Converter Operation - Herz HD140 Betriebsanleitung

3.3.2 Configuration for single-phase a.c. side channel
blowers
3.3.3 Special configurations and additional clamps
Terminal diagrams can be found in the motor terminal box for
voltage interchangeable motors, pole-changeable motors, FU
motors and other special configurations of threephase a.c. and
a.c. motors. This also applies to the optional thermal winding
protection and the space heater.
3.3.4 Configuration for units with attached frequency
converter
The mains connection with earthing conductor connection and
potential equalisation must be carried out in a professional
manner in accordance with the specifications in the enclosed
frequency converter assembly instructions.

4. INSTRUCTIONS FOR OPERATION AND USE

4.1 Basic information

Please observe the notes on designated use in section 1.1, as
well as the safety guidelines in sections 1.2 to 1.12.
If electrical current drops below the rated current of the drive
motor during operation, check to see if the mains voltage and
frequency match the appliance ratings (nameplate).
After protective shutdowns,
circuitbreaker, activation of the PTC evaluation unit by motors
with a PTC resistor sensor, or after a protective shutdown of the
frequency converter during FU applications, the appliance must
not be restarted until the problem has been identified and
eliminated.
If the side channel blower cannot be operated over the whole
range of the characteristic curve, the motor may overload if the
system resistance is too low (excessive current consumption). If
the possibility of overload due to system resistance cannot be
excluded, a pressure limiting valve must be provided on the
intake or pressure side.
The side channel blower must not be subjected to vibration or
impact loads.

4.2 Frequency converter operation

A frequency converter is used, allowing a wide range of speed
adjustments. There is only a small, load-related difference in rpm
between idle state and the max. load of the side channel
blowers.
To ensure trouble-free operation of the side channel
blowers, it is important that the converter meet the following
requirements:
Converter output equal to or greater than motor power
•
output *)
Converter current equal to or greater than motor
•
current *)
Converter output voltage equal to rated motor voltage
•
The pulse frequency of the converter should be 8 kHz,
•
since a lower pulse frequency can cause very noisy
motor operation.
The converter should have a connection for a
•
temperature sensor (PTC resistor sensor) or a
temperature switch (normally-closed contact)
*) Refer to the rating plate for data
The motor can be operated in a delta or star-point configuration,
depending on the input voltage of the converter.
10
e.g. tripping of the motor
The following U/f assignments must be confi gured at the
converter.
If this is ignored, the
disproportionately and the drive motor will fail to achieve its rated
speed.
Note!
Do not set the converter to a higher frequency
(rpm) than the frequency (fB) specified on the
nameplate, because this can overload the motor or
irreparably damage the side channel blower due to
overspeeding. Similarly, a so-called "boost" must
never be set at the converter because this would
result in excessive heating of the drive motor. The
temperature sensors must be connected to the
relevant converter inputs in order to protect the
drive motor. Single-phase
unsuitable for converter operation.
∗
To ensure safe and trouble-free operation, the
installation and safety instructions provided by
the frequency converter supplier in the operating
or application manuals must be strictly adhered
to.
Please note also
conditions, heavy soiling of the cooling fins can
occur in FUK-compliant appliances. If the cooling
capacity of the cooling fi ns is insufficient, the
frequency converter will shut down. Appliances
which are operated in these environments must be
inspected on a regular basis.
Protection by residual-current-operated circuit breaker
(FI circuit-breaker):
IGBT frequency converters produce discharge currents of >=3.5
mA due to their design principle. These discharge currents can
lead to unwanted tripping in systems protected by a 30 mA-FI
circuit-breaker.
If a fault occurs, fault currents can also discharge through the PE
conductor as direct current. If protection is needed on the supply
side by means of an FI circuit-breaker, then an ACDC sensitive
(type B) FI circuit-breaker must be used. Use of an FI circuit-
breaker other than type B can cause death or serious injury if a
fault occurs.
To meet the EN 61800-5-1 standard, the PE conductor must be
duplexed and routed through separate terminals or have a cross-
section of at least 10 mm² Cu.
Operation and connection to public grids:
Most frequency converters are designed to operate on industrial
grids. If the converter is connected directly to and operated on a
public grid, then additional interference suppression measures,
such as a mains choke, must be built into the mains feeder. For
further information, refer to the converter manufacturer's
specifications.
motor current will increase
a.c. motors
that, in certain ambient
BA HD140 V20 R11 10_2017 EU long.doc
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