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4.8 Electrical connection
Connection of the fans to the supply network depends on the drive type, i.e. if frequency
converters are to control the fan motors.
Connection of drive types
• Fixed speed (Direct On Line)
• Frequency converter (AC and PM motors)
The terminal box is on the outside of the fan casing.
Connection diagrams are inside the box lid.
The cable run must be in accordance with current
regulations, e.g. the EU standard for electromagnetic compatibility (EMC).
Frequency converters must be installed in accordance to the manufacturer's installation
documentation. Refer also to the Novenco document "Configuration of frequency converters
for Novenco fans".
Shield and connect the fans electrically to ground to eliminate interference and protect the
motor bearings and windings.
Refer to the motor documentation for methods to avoid impairment of the supply voltage
quality, among them distances between supply and signal cables. Methods may involve
installation of rectifiers, filters etc.
Connection references
• Connection diagram in terminal box lid
• Motor nameplate
Verify that the rotational direction of
the rotor complies with the arrow on
the outside of the fan casing. Flick the
fan power briefly On, then Off. If the
direction is wrong, disconnect the
main power supply and check the
connections.
Novenco ZerAx axial fan types AZL-AZN-AZW – Installation and maintenance
The installation and connection to the supply network must be done by authorised
personnel and according to current legislation, e.g. the EU standard for electromagnetic
compatibility (EMC).
- Connect the supply voltage directly in the
terminal box.
- Connect the supply voltage to the frequency
converter and the converter to the terminal box.
on fan
through frequency converters.
Direct connection of the supply
voltage in the terminal boxes on
PM motors ruins the motors and
voids the warranty.
• Order specification
• Appendices D, E and F on wiring on
page 28
Only fans with steel inner hubs may be run in
reverse and this for short periods at speeds up
to the max. allowable of normal direction. The
airflow is reduced to approx. 50% of normal for the
same system resistance. The pressure is reduced to
25%.
Reversible operation increases the risk of stall and
shortens fan life.
The rotor must be completely stationary, before
restart of the fan for directional change of rotation. It
is recommended to install a time delay for this
purpose.
ZerAx fans with
permanent magnet (PM)
motors require connection
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