14
U
B
0
f
B
Prohibited
range
EN
Operating and assembly instructions 1SD, 2SD
www.elektror.com
9016329 01.20/09
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. tripping of the motor circuit-
breaker, activation of the temperature switch (normally-closed
contact), or after a protective shutdown of the frequency con-
verter during FU applications, the appliance must not be re-
started until the problem has been identi
fi
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 low (excessive current con-
sumption). If the possibility of overload due to system resist-
ance cannot be excluded, a relief valve must be provided on
the discharge or intake side
.
Note!
It is not permitted to operate the 2SD range
with a relief valve as permanent overload protec-
tion.
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 di
ff
er-
ence 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 1.10.
• The converter should have a connection for 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
gu-
ration, 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 disproportion-
ately 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) speci-
fi
ed on the rating plate must never be set on the
converter otherwise the motor may be overloaded
or the side channel 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 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]
Motor output < 0.25 kW
5
10
0.25 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.
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 cur-
rents can lead to unwanted tripping in systems protected by
