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Operating and assembly instructions SVD
Following safety cut-off s such as triggering of the motor cir-
cuit breaker, operation of the PTC evaluator on motors with
a thermistor detector, or a frequency converter cut-off in
variable speed applications, restarting of the unit is permis-
sible only after the cause of the fault has been identifi ed and
cleared.
With blowers that cannot be utilised over their entire per-
formance curve, the motor can be overloaded if the system
resistance is too low (current draw too high). In this case,
restrict the volume fl ow with a damper fi tted to either the inlet
or discharge side.
The blower must not be subjected to any vibratory or shock
loads.
4.2 Frequency converter operation
A greater speed adjustment range is possible by using a
frequency converter, whereby only a slight load-dependent
speed diff erence between no-load and maximum loading of
blowers and side channel blowers occurs.
For trouble-free operation of blowers it is important that
the converter fulfi ls the following requirements:
• Converter output greater than or equal to motor output *)
• Converter current greater than or equal to motor current *)
• Output voltage of converter equal to the rated motor
voltage
• Supply voltage max. 480V, including 5% voltage tolerance
• The pulse frequency of the converter should be 8 kHz
because a lesser frequency generates loud motor noise.
• The values for the maximum/minimum frequency can be
found at 1.12.
• The converter must have a connection for a temperature
sensor (PTC thermistor detector) or temperature monitor
(break contact).
*) See rating plate for values
The motor can be operated in delta or star connection,
depending on the input voltage of the converter.
It is imperative to make the following U/f assignment at
the converter.
U
B
0
f
and U
= refer to rating plate
B
B
Unless this is done, the current will increase disproportion-
ately and the drive motor will not achieve the 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.
www.elektror.com
Prohibited
range
f
B
) specifi ed on the
B
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.
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
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 seri-
ous injury if a fault occurs. To meet the EN 61800-5-1 stand-
ard, 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:
See 3.5
5 INSTRUCTIONS FOR MAINTENANCE
Wearing parts are subject to the recommended maintenance
intervals (see 5.1 to 5.3). The lifespan of wearing parts (ball
bearings and fi lters) is dependent on the hours in service, the
loading and other factors, such as the temperature etc.
Maintenance and repair work itself along with any measures
taken, must only be carried out by staff with adequate knowl-
edge and expertise who undergo regular training. Besides
the operating instructions for the particular unit and the regu-
lations and recommendations for the entire system, the fol-
lowing must also be observed:
Inspection and maintenance intervals:
Depending on the hours in service, loadings and conditions
of deployment, the blower's owner has to decide himself that
the cleaning, inspection and maintenance intervals are to be.
Run-up time
Expiry time
[s]
[s]
5
10
10
20
20
40
30
60
30
100
17
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