14
U
B
0
f
B
Prohibited
range
www.elektror.com
Operating and assembly instructions HRD Boosted
9016341 07.20/12
EN
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 instructions on the intended use, de-
scribed in 1.1, as well as the safety instructions described
in 1.2 to 1.11.
If the rated current of the drive motor is exceeded during op-
eration, check whether the mains voltage and frequency cor-
respond with the device data.
The device can only be restarted after the cause of the fault
has been identi
fi
ed and eliminated following surge protec-
tion, such as triggering of the motor protection switch, trig-
gering of the PTC evaluation device with motors
fi
tted with a
resistor sensor or frequency converter surge protection with
FC applications.
With blowers that cannot be used over the whole character-
istic curve (max.
fl
ow rate, see rating plate), the motor can
be overloaded if the system resistance is too low (too high
power consumption). Restrict the
fl
ow rate in this case using
a throttle valve built into the pressure or air intake side.
The blower must not be subjected to any vibration stress or
impact force.
4.2 Frequency converter operation
A wide speed setting range is possible using a frequency
converter, whereby there is only a small speed di
ff
erence be-
tween the idle running and the maximum load of the blower
depending on the load.
It is important the the converter meets the following re-
quirements to ensure trouble-free operation of the blow-
ers:
• Converter speed equal to or greater than the motor
output *)
• Converter current equal to or greater than the motor
output *)
• Converter output voltage equal to the motor rated voltage
• Supply voltage max. 480V, including 5% voltage tolerance
• The converter pulse frequency should be 8 kHz as a lower
pulse frequency produces loud motor noises.
•
The values for the maximum/minimum frequency can be
found a
t 1.5.
• The converter must have a connection for temperature
sensors (PTC resistor sensors) or a temperature gauge
(break contact)
*) Values, see rating plate
The motor can be operated in a delta or star connection
depending on the converter input voltage.
The following U/f assignments must be con
fi
gured at
the converter.
f
B
and U
B
= refer to rating plate
Failure to observe this information leads to a disproportion-
ate increase in the motor current and the drive motor does
not reach the 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.
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:
Blower type
Start-up time
[s]
Expiry time
[s]
HRD 7 FU-120
30
60
HRD 60 FU-135
30
60
HRD 2 FU-130
30
60
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 circuit breakers
(FI-circuit breakers):
The current IGBT frequency converters inherently produce
leakage currents > =3.5 mA. These leakage currents can
lead to false alarms in systems that are fused using a 30 mA
FI-circuit breaker.
In the event of a fault, residual current can also leak as direct
current via the protective conductor. If protection is required
on the supply side by means of a FI-circuit breaker, it is im-
portant that an FI-circuit breaker is used that is sensitive to
universal current (type B). The use of an incorrect FI-circuit
breaker other than type B can lead to death or serious injury
in the event of a fault.
The protective conductor must be designed to connect twice
via isolated terminals or via a protective conductor cross-
section with a minimum of 10 mm2 Cu to comply with the
EN61800-5-1 standard.
