Switching Frequency; Mechanical Speed Limitation - WEG W22 Premium E3 Manual De Instalación, Operación Y Mantenimiento

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Table 6.11 – Recommendation on the bearing insulation for inverter driven motors
Frame size
IEC 315 and 355
NEMA L447/9, 504/5, 5006/7/8, 5009/10/11, 586/7, 5807/8/9,
5810/11/12 and 588/9
IEC 400 and higher
NEMA 680 and higher
The shaft grounding system for explosion-proof motors can be used only inside the enclosure. For other
types of protection the shaft grounding system is not allowed.

6.14.3. Switching Frequency

The minimum inverter switching frequency must not be lower than 2.5 kHz and should not exceed 5 kHz.
The non-compliance with the criteria and recommendations indicated in this manual may void the
product warranty.
The use of sparking components, such as grounding brushes, is not allowed in explosive atmospheres.

6.14.4. Mechanical speed limitation

Table 6.12 shows the maximum speeds allowed for motors driven by frequency inverter.
Frame size
IEC
63-90
100
112
132
160
180
200
225-630
Note:
To select the maximum allowed motor speed, consider the motor torque derating curve.
For more information on the application of frequency inverters, contact WEG or check the "Technical Guidelines
for Induction Motors driven by PWM Frequency inverters" available at www.weg.net.
106 Manual of Electric Motors
Table 6.12 – Maximum motor speed (in rpm).
NEMA
143/5
-
182/4
213/5
254/6
284/6
324/6
364/5-9610
Recommendation
One bearing is isolated
NDE-bearing is isolated
Maximum speed for
DE-bearing
standard motors
6201
6202
6203
6204
6205
6206
6207
6307
6308
6309
6311
6312
6314
6315
6316
6319
6220
6320
6322
6324
6328
6330
10400
8800
7600
6800
6000
5300
4400
4200
3600
3600
3200
3000
3600
2200
1900
1800
1800
1800