Qualification Of Personnel; Safety Installations; Protection Against Accidental Contact; Air Flow Direction And Direction Of Rotation - Helios HRF 250 Ex Série Notice De Montage Et D'utilisation

Installation and Operating Instructions
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ATTENTION
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WARNING
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ATTENTION
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ATTENTION
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Special execution
HRF..  – Axial high-performance fans
2.1

Qualification of personnel

The electrical connections of the fan may only be performed by qualified electricians.
Installation-, start-up-, maintenance work may only be carried out by explosion-proof authorised specialists.
2.2 Additional safety installations
All 1-phase explosion-proof motors are equipped with thermal contacts wired in series with the coil which automatically
turn off and restart after cooling.
2.3

Protection against accidental contact

When installing observe the valid regulations for labour protection and accident prevention! The operator is
responsible for compliance!
– Any contact with rotating parts must be avoided. Make sure that no persones, textiles or other materials which
could be sucked in, as for instance clothing of persons are close to the suction area of the fan.
– Certain fan types are delivered serially with a protection grille on the inlet side (DIN 31001). Depending on the
installation conditions a contact safety device on the discharge side may be necessary. Corresponding grilles are
available as accessories.
– Fans protected by their installation in ventilation ducts or closed aggregates do not need a protection grille, if the
installation guarantees the same protection. We emphasize that the operator will be held responsible for accidents
occuring as a result of missing protection devices.
2.4

Air flow direction and direction of rotation

The airflow direction is pushing air across the motor (see airflow direction- and direction of rotation arrows). The correct
direction of rotation - as viewed from the front of the impeller - counterclockwise, besides, wear protective glasses
(Fig.1).
AC types are to be connected by interchanging two phases for counterclockwise rotation in the
field.
Wrong direction of rotation can cause overheating of the motor!
2.5

Speed control

Explosion-proof fans of HRF .. series are not speed cont-
rollable and may not be operated by means of frequency
inverter!
Motors in execution increased safety „e" are generally exclu-
ded from operation with frequency inverters.
NOTE: AC motors (special version on request) in flameproof en-
closure „d" may be operated by means of frequency inverters. It
is necessary to install filters to protect the motor. This needs
to be clarified in each case, object-related!
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EN
clockwise rotating
Fig.1