WEG SSW-07 User Manual - page 43
Chapter 5 - prOGraMMING INFOrMatION aND SUGGeStIONS
42
English
5.2.3 Service Factor
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
x N x In = New_Line x In
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.
1
x 3 x In = 2.40 x In
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.
1
x 3 x In = 2.61 x In
1.15
The new line of 3xIn with S.F.= 1.15 must be situated in 2.61xIn.
2x
t(s)
0
xIn of the
motor
Cold
25
20
15
3x
4x
S.F. =1.15
S.F. =1.25
Figure 5.8
- Using the S.F. to find the new time