User Manual Instruction Manual

13-80 GV6000 AC Drive User Manual
overload factor is 1.2, then motor thermal overload will use 12 Amps as 100%.
3. Motor OL Hertz (47) is used to further protect motors with limited speed ranges.
Since some motors may not have sufficient cooling ability at lower speeds, the
Overload feature can be programmed to increase protection in the lower speed
areas. This parameter defines the frequency where derating the motor overload
capacity should begin. As shown here, the motor overload capacity is reduced
when operating below the motor overload Hz. For all settings of overload Hz other
than zero, the overload capacity is reduced to 70% when output frequency is zero.
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.
Changing Overload Factor
20
40
60
80
100
120
140
0 102030405060708090100
% of Base Speed
Continuous Rating
OL % = 1.20
OL % = 1.00
OL % = 0.80
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