Service Factor - WEG SSW-07 Manual Del Usuario

Chapter 5 - prOGraMMING INFOrMatION aND SUGGeStIONS

5.2.3 Service Factor

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When the Service Factor (S.F.) is different from 1.00 and if there is
a need to use it, one can check in the graph, in cold condition, the
points for S.F.=1.15 and in the table for S.F.=1.15.
If one wishes to know the thermal protection working times for other
S.F. values just move the x ln line of the motor to the left.
1
S.F.
N= Number of motor nominal current times.
Examples:
Considering the line of 3xIn with S.F.=1.00 to S.F=1.25.
The new line of 3xIn with S.F.= 1.25 must be situated in 2.40xIn.
Considering the line of 3xIn with S.F.=1.00 to S.F.=1.15.
The new line of 3xIn with S.F.= 1.15 must be situated in 2.61xIn.
t(s)
0
Figure 5.8 - Using the S.F. to find the new time
x N x In = New_Line x In
1
x 3 x In = 2.40 x In
1.25
1
x 3 x In = 2.61 x In
1.15
Cold
2x 3x 4x
S.F. =1.15
S.F. =1.25
25
20
15
xIn of the
motor