Operating Conditions - WEG W22 Premium E3 Manual De Instalación, Operación Y Mantenimiento

7.2. OPERATING CONDITIONS

Unless otherwise stated in the Purchase Order, electric motors are designed and built to be operated at
altitudes up to 1000 meters above sea level and in a temperature range from -20 °C to +40 °C. Any deviation
from the normal condition of motor operation must be stated on the motor nameplate. Some components must
be changed if the ambient temperature is different from the specified one. Please contact WEG to check the
required special features.
For operating temperatures and altitudes differing from those above, the factors indicated in Table 7.2 must be
applied to the nominal motor power rating in order to determine the derated available output (Pmax = Pnom x
correction factor).
T (°C)
1000
10
15
20
25
30
35
40 1.00
45 0.95
50 0.92
55 0.88
60 0.83
65 0.79
70
0.74
75 0.70
80 0.65
Motors installed inside enclosures (cubicles) must be ensured an air renewal rate in the order of one cubic
meter per second for each 100 kW installed power or fraction of installed power. Totally Enclosed Air Over
motors - TEAO (fan and exhaust / smoke extraction) are supplied without cooling fan and the manufacturer of
the driven machine is responsible for sufficient motor cooling. If no minimum required air speed between motor
fins is indicated on the motor nameplate, ensure the air speed indicated in the table 7.3 is provided. The values
shown in Table 7.3 are valid for 60 Hz motors. To obtain the minimum air speed for 50 Hz motors, multiply the
values in the table by 0.83.
Table 7.3 – Minimum required air speed between motor fins (metres/second).
Frame
IEC NEMA
63 to 90 143/5
100 to 132 182/4 to 213/5
160 to 200 254/6 to 324/6
225 to 280 364/5 to 444/5
315 to 355 445/7 to 588/9
The voltage and frequency variations may affect the performance characteristics and the electromagnetic
compatibility of the motor. The power supply variations should not exceed the values specified in the applicable
standards. Examples:
ABNT NBR 17094 - Parts 1 and 2. The motor has been designed to supply the rated torque for a combined
g
variation in voltage and frequency:
Zone A: ±5% of the rated voltage and ±2% of the rated frequency.
g
Zone B: ±10% of the rated voltage and +3% -5% of the rated frequency.
g
When operated continuously in Zone A or B, the motor may show performance variations and the operating
temperature may increase considerably. These performance variations will be higher in Zone B. Thus it is not
recommended to operate the motor in Zone B during extended periods.
IEC 60034-1. The motor has been designed to supply the rated torque for combined variation in voltage and
g
frequency:
Zone A: ±5% of the rated voltage and ±2% of the rated frequency.
g
Zone B: ±10% of the rated voltage and +3% -5% of the rated frequency.
g
When operated continuously in Zone A or B, the motor may show performance variations and the operating
temperature may increase considerably. These performance variations will be higher in Zone B. Thus it is not
recommended to operate the motor in Zone B during extended periods. For multivoltage motors (example 380-
415/660 V), a ±5% voltage variation from the rated voltage is allowed.
Table 7.2 - Correction factors for altitude and ambient temperature.
1500 2000 2500
1.00
1.00 0.96
1.00 0.95 0.93
0.97 0.94 0.90
0.92 0.90 0.88
0.90 0.87 0.85
0.85 0.83 0.81
0.82 0.80 0.77
0.76 0.74 0.72
0.71 0.69 0.67
0.68 0.66 0.64
0.64 0.62 0.60
2
14
18
20
22
25
Altitude (m)
3000 3500 4000
0.97
0.98 0.94
1.00 0.95 0.91
0.95 0.93 0.89
0.92 0.90 0.86
0.90 0.88 0.84
0.86 0.82 0.80
0.85 0.81 0.78
0.82 0.80 0.77
0.78 0.76 0.73
0.75 0.73 0.70
0.70 0.68 0.66
0.66 0.64 0.62
0.62 0.60 0.58
0.58 0.56 0.55
Poles
4 6
7 5
10 8
20 12
22 18
25 20
Manual of Electric Motors
www.weg.net
4500 5000
0.92 0.88
0.90 0.86
0.87 0.83
0.85 0.81
0.82 0.78
0.80 0.75
0.76 0.71
0.74 0.69
0.72 0.67
0.70 0.65
0.67 0.62
0.62 0.58
0.58 0.53
0.53 0.49
0.48 0.44
8
4
6
7
12
15
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