Instructions For Operation And Use; Basic Information; Frequency Converter Operation - Elektror RD 0 Betriebs- Und Montageanleitung

Operating and assembly instructions RD
Blowers with an in-built frequency converter (FUK):
Devices with an in-built frequency converter meet the require-
ments of the EC "Electromagnetic Compatibility" Directive
2004/108/EC under consideration of EN 61800-3 Category
EN C2 (industrial environment), taking into account the EMC in-
structions from the frequency converter and the information
in the Elektror operating and assembly instructions.
Warning!
This product may cause high-frequency inter-
ference 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 start-
up.
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 1.10.
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 circuit-
breaker, 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 trouble-
shooted.
If the 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). The
volumetric air fl ow should be reduced in this case by means
of a throttle valve fi tted on the intake or discharge side.
The 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
14
speed adjustments. There is only a small, load-related dif-
ference in rpm between idle state and the max. load of the
blowers and the lateral channel blower.
To ensure trouble-free operation of blowers and lateral
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,
because a lower pulse frequency will lead to noisy motor
operation
• A minimum rotary frequency of 5 Hz should be ensured
with devices suitable for operation with a frequency con-
verter (50 / 60 Hz) and a minimum frequency of 35 Hz
with fast rotating frequency converter devices (> 60 Hz)
depending on the frequency converter type.
• The converter should have a connection for a tempera-
ture 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 gu-
ration, depending on the input voltage of the converter.
The following U/f assignments must be confi gured at
the converter.
U
B
0
f and U = refer to rating plate
B B
If this is ignored, the motor current will increase dispropor-
tionately and the drive motor will fail to achieve its rated
speed.
Warning!
To avoid personal damage, destruction of the
blower or motor overload, a higher frequency
(speed) than the frequency (f
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 corre-
sponding 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 contamina-
tion of the cooling fi ns with the FUK devices. The
frequency converter switches off if the cool-
ing output on the cooling fi ns 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 to avoid high component loads and faults in
the converter operation:
Device motor output
Motor output < 0.25 kW
0.25 kW < Motor output
<=3.0 kW
3.1 kW < Motor output
<= 7.5 kW
7,6 kW < Motor output
<= 11.0 kW
11,1 kW < Motor output
<= 30.0 kW
A uniform run-up and expiry must be guaranteed within the
run-up and expiry times.
No speed changes must occur during operation that exceed
the speed change during run-up and expiry.
www.elektror.com
Prohibited
range
f
B
) specifi ed on the
B
Run-up time Expiry time
[s] [s]
5 10
10 20
20 40
30 60
30 100