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Description
3.3 Installation
Feature
Efficiency classification of three-phase squirrel-cage induction motors
IEC standard voltages
3.3.2
Cooling and ventilation
The machines of this series are three-phase induction machines with a closed primary (internal)
cooling circuit and an open secondary cooling circuit (surface cooling). The surface cooling
varies depending on the version.
3.3.2.1
Motors with a fan
Self-ventilation (standard): Cooling method IC 411 according to EN / IEC 60034-6
Located at the ND end of the stator housing is an air intake cowl that guides the external air on
its way to the motor. The external air is drawn in through openings in the air intake cowl and
flows axially across the outer cooling ribs of the motor frame. The fan wheel for the external
flow of cooling air is attached to the machine shaft.
The fan wheels are bidirectional.
Check the cooling effect below rated speed in the case of frequent switching or braking – or if
the speed is controlled continually below the rated speed.
Forced ventilation (optional): Type of cooling IC 416 in accordance with EN / IEC 60034-6
Cooling that does not depend on the speed is achieved by means of a unit that is independent
of the motor operating state (forced ventilation). This unit is closed to the outside by a fan cover.
It has its own main drive with fan impeller which creates the cooling air flow required for cooling
the motor.
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Standard
EN / IEC 60034-30-1
IEC 60038
1PC134, 1PC136 crane motors SH 132 ... 315
Operating Instructions, 12/2023, A5E43212221A
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