WEG SSW-07 Manual Del Usuario página 47

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Chapter 5 - prOGraMMING INFOrMatION aND SUGGeStIONS
46
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Example of readjustment of the nominal current:
I = 30 A
SSW-07
I = 25 A
MOTOR
S. F. = 1.15
Setting of the Motor Current = I
30 A = 96 %
ATTENTION!
The increased motor current has direct impact on the maximum
thermal class, that protects the motor, even if the S.F. parameter is
set.
Determine the maximum thermal class, considering the service
factor:
Stall Current = 6.6 x ln
Hot Stall Time = 6 s
Service Factor = 1.15
Before the maximum thermal class is verified in figure 4.9, the stall
current must be divided by the service factor.
Stall Current / S.F. = 6.6 / 1.15 = 5.74
t(s)
6 s
0
Figure 5.12 - Checking of the maximum thermal class, considering the S.F.
Class 20 is the highest class that protects the motor, if the service
factor is used.
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x S.F. / I
MOTOR SSW-07
Hot
5.74 x In of the motor
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= 25 A x 1.15 /
25
20
15
xln
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