Temperature Warning; Motor Circuit Breaker; Noise Emission; Electrical Hazards - Herz HD140 Betriebsanleitung

1.6 Blowing effect
Warning!
The blowing effect is very powerful on the exhaust
side. Sucked in objects may be ejected at
very high speed (danger of injury).
The side channel blowers are designed for
delivery of clean air only. To reliably prevent the
sucking-in of foreign objects or contaminants,
which might be discharged, these objects have to
be removed before entering into the side channel
blower by installing a filter. Do not reach into the
exhaust.
1.7 Temperature
Warning!
The motor-/ blower housing heats up during
operation. If the temperature rises above +50 °C,
the side channel blower must be protected by the
operating company against direct contact (risk of
burning!).

1.8 Motor circuit breaker

Before putting the blower into operation, be sure to safeguard
the drive motor with a motor circuit-breaker (this does not apply
to frequency-converter-operated appliances). Where appliances
are frequency-converter-operated, the existing temperature
sensor (PTC resistor sensor) or temperature switch (normally-
closed contact) must be connected to the converter and
evaluated.

1.9 Noise emission

Note!
Wear hearing protection during operation at a
daily exposure level of 80 dB(A) and above,
and/ or a peak sound pressure level of 135 dB(C)
and above.
Failure to do so may cause hearing damage.
The noise generated by a side channel blower is not constant
throughout the performance range. For details of radiated noise
level, please refer to the table on page 14.
In some cases, sound insulation may be necessary (it is
recommended that emission levels be measured by the
operator). Sound insulation must be provided by the operator to
avoid exceeding the statutory maximum levels at the workplace
and in the immediate vicinity of the side channel blower.
No sound insulation of any kind whatsoever should cause the
ambient temperature to exceed +40°C at the drive motor (this is
not permissible).
10 Technische Änderungen vorbehalten / Technical changes reserved
1.10 V-belt drive
(Only applies to side channel blower without motor)
Note!
The side channel blowers are equipped as
standard with V-belt pulleys for narrow V-belts
according to DIN 7753.
To avoid premature damage to the deep-groove
ball bearings, the V-belt drives must be correctly
pretensioned. The V-belt drive must be rated using
the calculation method specified by the belt
manufacturer.
The blower belt pulley must not be modified.

The max. permissible compressor speed must not be

exceeded (see table on page 14).
The belt drive and freely rotating parts must be

covered with belt guard according to DIN EN ISO
13857.
The belt tension should be checked after the blower

has been running for approx. 2 hours. The belts must
be retensioned if necessary.
Never put the side channel blower into operation if the

protective grating is not installed and firmly screwed
on (risk of injury).

1.11 Electrical hazards

Danger!
Danger from electric current!
Live components carry current and cause fatal
injuries!
Deactivate the device before opening it, reaching
into it or inserting tools into it; check that
components are not live and secure it against
reactivation.
1.12 Speeds
Warning!
The maximum speed stamped on the motor rating
plate must never be exceeded in order to prevent
personal injury. The side channel blower is at risk
of mechanical damage if the speed is exceeded.
This can cause serious injury or death!
Each component on the side channel blower has unique natural
frequencies. These can be induced by certain side channel
blower speeds, which may result in resonance mode. The side
channel blowers are designed in such a way that resonance
does not generally occur at a constant operating speed.
This may be induced in certain circumstances when the speed is
changed if the side channel blower is operated on a frequency
converter. These circumstances are also influenced by the
customer's individual installation
connection.
These natural frequencies must be excluded by parametrising
the frequency converter accordingly should they be present
within the speed range of the side channel blower.
Maximum frequency
(see rating plate)
50 Hz
60 Hz
> 60 Hz
situation or ventilation
Minimum frequency
5 Hz
5 Hz
20 Hz
BA HD140 V30 R20 07_2021 DE-GB.doc