BA HD140 V30 R20 07_2021 DE-GB.doc
Technische Änderungen vorbehalten / Technical changes reserved
13
Side channel blowers with frequency converter operation
(FU):
Prior to the start-up and during operation of the device on a
frequency converter (provided that this is suitable) it is essential
that the EMC instructions from the frequency converter
manufacturer and the information in the
HERZ
operating and
assembly instructions are observed in order to meet the
requirements of the EC “Electromagnetic Compatibility” Directive
2014/30/EU.
If the device is delivered together with a frequency converter
package for switch cabinet or wall mounting closer to the motor,
it is possible to comply with EN 61800-3 category C2 (Industrial
environments), taking into consideration the abovementioned
EMC instructions.
Warning!
This
product
may
cause
high-frequency
interference in a residential environment that may
require screening measures.
Side channel blowers with an in-built frequency converter
(FUK):
Devices with an in-built frequency converter meet the
requirements of the EC “Electromagnetic Compatibility” Directive
2014/30/EU under consideration of EN 61800-3 Category C2
(industrial environment), taking into account the EMC
instructions from the frequency converter and the information in
the Elektror operating and assembly instructions.
Warning!
This
product
may
cause
high-frequency
interference in a residential environment that may
require screening measures.
A CE conformity assessment with the relevant standards and
guidelines must be carried out in all cases before the startup.
4.0. 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.
After protective shutdowns, e.g. tripping of the motor
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 identifi ed 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 high (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
• Supply voltage max. 480V, including 5% voltage tolerance
• The pulse frequency of the converter should be 8 kHz, since a
lower pulse frequency can cause very noisy motor operation.
• The values for the maximum/minimum frequency can be found
at 1.12.
• 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 confi guration,
depending on the input voltage of the converter.
The following U/f assignments must be confi gured at the
converter.
If this is ignored,
the
motor current will
increase
disproportionately and the drive motor will fail to achieve its rated
speed.
Warning!
To avoid personal damage, destruction of the side
channel blower or motor overload, a higher
frequency (speed) than the frequency (fB)
specified on the rating plate must never be set on
the converter otherwise the motor may be
overloaded or the blower destroyed due to the
increased speed. The temperature sensors are
connected to the corresponding converter inputs
to protective the drive motor. Single-phase
alternating current motors are not suitable for
converter operation.
It is absolutely essential that you observe the
installation and safety instructions described in
the respective operating or application manuals
provided by the frequency converter supplier to
guarantee a safe and trouble-free operation.
It is also important to note that special ambient
conditions may lead to a high level of
contamination of the cooling fins with the FUK
devices. The frequency converter switches off if
the cooling output on the cooling fins is not
adequate.
Regular cleaning is required for devices in these
environments.
Note!
The following times apply for the respective
device motor output class (see rating plate) with
run-up/expiry as well as speed changes in order to
avoid high component loads and faults in the
converter operation:
