Motors Driven By Frequency Inverter - WEG W22 Premium E3 Manual De Instalación, Operación Y Mantenimiento

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Number of leads
3 leads
6 leads
9 leads
12 leads
Table 6.9 shows examples of possible indirect starting methods to be used according to the voltage indicated
on the motor nameplate and the power supply voltage.
Operating
Nameplate voltage
voltage
220 V
220/380 V
380 V
220 V
220/440 V
440 V
230 V
230/460 V
460 V
380/660 V 380 V
220 V
220/380/440 V 380 V
440 V
The WQuattro line motors must be started direct on-line (DOL) or driven by a frequency inverter in scalar
mode.
The starting by frequency inverter may be another starting method to avoid overloading the power supply line.
For more information about the motor control by frequency inverter, see item 6.14.

6.14. MOTORS DRIVEN BY FREQUENCY INVERTER

The operation with frequency inverter must be stated in the Purchase Order since this drive type may
require some changes of the motor design.
Motors driven by frequency inverters must have their winding thermal protections connected.
Wmagnet Motors must only be driven by WEG frequency inverter.
The frequency inverter used to drive motors up to 690 V must be fitted with Pulse With Modulation (PWM) with
vector control.
Motors driven by frequency inverters have an additional nameplate fixed on the motor frame indicating the
Service Factor, inverter type, frame size, and/or load type (constant or variable torque) as function of the speed
range and motor torque.
When a motor is driven by a frequency inverter at lower frequencies than the rated frequency, you must reduce
the motor torque to prevent motor overheating. The torque reduction (derating torque) can be found in the item
6.4 of the "Technical Guidelines for Induction Motors driven by PWM Frequency inverters" available on the site
www.weg.net.
104 Manual of Electric Motors
Table 6.8 - Starting method x number of motor leads.
Table 6.9 – Starting methods x voltage
Autotransformer
Star-delta
Starting
YES YES
NO YES
NO YES
NO YES
NO YES
NO YES
YES YES
YES YES
NO YES
YES YES
Possible starting methods
Autotransformer
Soft-starter
Star-Delta
Autotransformer
Soft-Starter
Star-Delta
Series/Parallel
Part Winding
Autotransformer
Soft-Starter
Star-Delta
Series/Parallel
Part Winding
Autotransformer
Soft-Starter
Starting by
Part Winding
series/parallel
Starting
switch
NO NO
NO NO
YES YES
NO NO
YES YES
NO NO
NO NO
YES YES
YES YES
NO NO
Starting by
soft-starter
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES