www.weg.net
Manual of Electric Motors
94
E
N
G
LI
S
H
When motors are supplied with shaft grounding system, monitor the grounding brush constantly during
its operation and, when it reaches the end of its useful life, it must be replaced by another brush with the
same specification.
The non-compliance with the criteria and recommendations indicated in this manual may void the
product warranty.
6.14.2. Bearing insulation
Only the motors in IEC frame size 400 (NEMA 680) and larger are supplied, as standard, with insulated bearing.
If motor must be driven by frequency inverter, insulate the bearing according to Table 6.9.
6.14.3. Switching frequency
The minimum inverter switching frequency must not be lower than 2.5 kHz and should not exceed 5 kHz.
Table 6.9
- Recommendation on the bearing insulation for inverter driven motors
Frame size
Recommendation
IEC 315 and 355
NEMA 445/7, 447/9, L447/9, 504/5, 5006/7/8, 5009/10/11, 586/7,
5807/8/9, 5810/11/12 and 588/9
g
Insulated bearing/end shield
g
Grounding between shaft and frame by grounding brush
IEC 400 and larger
NEMA 680 and larger
g
Insulated NDE bearing
g
Grounding between shaft and frame by grounding brush
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
.
6.14.4. Mechanical speed limitation
Table 6.10 shows the maximum speeds allowed for motors driven by frequency inverter.
Table 6.10
- Maximum motor speed (in rpm)
Frame size
DE-bearing
Maximum speed for
standard motors
IEC
NEMA
63-90
143/5
6201
6202
6203
6204
6205
10400
100
-
6206
8800
112
182/4
6207
7600
6307
6800
132
213/5
6308
6000
160
254/6
6309
5300
180
284/6
6311
4400
200
324/6
6312
4200
225-630
364/5-9610
6314
3600
6315
3600
6316
3200
6319
3000
6220
3600
6320
2200
6322
1900
6324
1800
6328
1800
6330
1800
Page 165
Содержание BN 5-12 Series
Страница 13: ...TAB 1 DEVICE DATA SHEETS ...
Страница 18: ...TAB 2 APPROVED SUBMITTAL ...
Страница 23: ...All data subject to change without notice 1 800 ASK 4WEG www weg net 14 ...
Страница 26: ...Your advantages our pumps ...
Страница 45: ...ADV 2 13E And what can we get flowing for you Your nearest contact Or visit www seepex com ...
Страница 117: ...TAB 3 INSTALLATION OPERATIONS AND MAINTENANCE ...
Страница 133: ...Page 37 ...
Страница 233: ...www weg net Manual of Electric Motors 64 ENGLISH Figure 2 1 IEC motor nameplate Page 135 ...
Страница 234: ...www weg net Manual of Electric Motors 65 ENGLISH Figure 2 2 NEMA motor nameplate Page 136 ...
Страница 306: ...TAB 4 AS BUILTS AND SUPPLEMENTAL INFORMATION ...
Страница 307: ...R Page 29 ...
Страница 308: ...R Page 30 ...