14
U
B
0
f
B
Prohibited
range
EN
Operating and assembly instructions S-HP
www.elektror.com
9016325 01.20/07
taking into consideration the above-mentioned EMC instruc-
tions.
Warning!
This product may cause high-frequency inter-
ference in a residential environment that may
require screening measures.
Blowers with an in-built frequency converter (FUK):
Devices with an in-built frequency converter meet the re-
quirements of the EC “Electromagnetic Compatibility” Direc-
tive 2014/30/EU under consideration of EN 61800-3 Catego-
ry 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 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 1.11.
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. activation of the PTC evalu-
ation 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 troubleshooted.
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
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 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 1.11.
• 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 con
fi
gura-
tion, depending on the input voltage of the converter.
The following U/f assignments must be con
fi
gured at the
converter.
f
B
and U
B
= refer to rating plate
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
B
) speci
fi
ed 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 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 o
ff
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
Run-up time
[s]
Expiry time
[s]
1.1 kW < Motor output
<= 3.0 kW
10
20
3.1 kW < Motor output
<= 7.5 kW
20
40
7.6 kW < Motor output
<= 11.0 kW
30
60
11.1 kW < Motor output
<= 30.0 kW
30
100
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.
