2-98 Motor Overload
During DC injection the motor current may exceed 70% of FLA, but this
will cause the Motor Thermal Overload to trip sooner than when operating
at base speed. At low frequencies, the limiting factor may be the Drive
Thermal Overload.
{Motor OL Factor]
[Motor OL Factor] is used to adjust for the service factor of the motor.
Within the drive, motor nameplate FLA is multiplied by motor overload
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 without the need to adjust the motor FLA. For example, if
motor nameplate FLA is 10 Amps and motor overload factor is 1.2, then
motor thermal overload will use 12 Amps as 100%.
The effective overload factor is a combination of overload Hz and overload
factor.
Changing Overload Hz
20
40
60
80
100
120
0 102030405060708090100
% of Base Speed
Continuous Rating
OL Hz = 10
OL Hz = 25
OL Hz = 50
20 Minutes
1 Minute 1 Minute
100%
150%
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