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MVA 02 rev 5 - December 2017
Make the connection to the grounding connector before making all other connections.
Check that the connection layout (see Fig. ) is suitable for the power supply voltage.
Standard electric motors can normally operate indifferently in both rotation directions. To invert the rotation
direction, it is sufficient to exchange any two of the power supply cables directly on the terminal board.
CAUTION:
It is the responsibility of the installer to provide an electrical power supply system for the fan in
conformity with the EN 60204-1 standard.
In particular, an electrical cut-off switch must be provided near the fan, so that maintenance
personnel have direct control over power supply to the fan (see points 9.2.6.3 Enabling
Control and 10.7 Emergency Stop Devices of the EN 60204-1 standard).
In addition, the designer of the electrical system must provide controls for starting, normal stopping and
emergency stopping, in conformity with Annex I of MACHINERY DIRECTIVE 2006/42/EC.
CAUTION:
It is the responsibility of the customer and/or electrical installer to choose the correct size and
type of the device and of cables used for electrical connections to the fan, depending on the
motor installed and the mains power supply system.
Work may be done on electrical components only with the fan at a standstill and disconnected from the
electrical power supply.
Before installation and starting, check that the data on the motor identification plate are in conformity with the
characteristics of the electrical power supply system.
The layouts shown are merely indicative. Consult the connection layout provided by the motor manufacturer.
Triple-phase single-speed motors
Triple-phase motors
Single winding
Single voltage
Triple-phase motors
Two separate windings
Single voltage
Delta connection
Dahlander or PAM connection for high
speed
Connection for high speed
Star connection
Dahlander or PAM connection for low
speed
Connection for low speed
Fig. 5-7 Diagram of electrical connections for one-speed and two-speed motors