90 Rockwell Automation Publication 20C-PM001F-EN-P - March 2012
Appendix B Application Notes
[Motor OL Hertz]. For all settings of [Motor OL Hertz] other than zero, the
overload capacity is reduced to 70% at an output frequency of zero.
[Motor NP FLA] is multiplied by [Motor OL Factor] to select the rated current
for the motor thermal overload. This can be used to raise or lower the level of
current that will cause the motor thermal overload to trip. The effective overload
factor is a combination of [Motor OL Hertz] and [Motor OL Factor].
Changing Overload Hz
0102030405060708090100
% of Base Speed
Continuous Rating
OL Hz = 10
OL Hz = 25
OL Hz = 50
0
20
40
60
80
100
120
Changing Overload Factor
0102030405060708090100
% of Base Speed
Continuous Rating
OL % = 1.20
OL % = 1.00
OL % = 0.80
0
20
40
60
80
100
120
140
Note: This graph represents a motor with a speed range of 2:1.
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