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With hot start enabled (08-05 = xx1xb), motor overload protection occurs in 3 and a half minutes when operating
the motor at 150% of the motor rated current at an output frequency greater than 60Hz.
Refer to the following figure 4.4.71 for an example of motor overload protection standard curve.
Figure 4.4.71 Motor overload protection curve (example: standard motor)
When using force cooled motors (Special inverter motor), thermal characteristics are independent of the motor
speed, set 08-05 = x1xxb.
When 08-05 = x1xxb, overload protection function is based on motor rated current for output frequencies between
6 and 60Hz. If the output frequency is lower than 1Hz, the overload protection function uses 83% of the motor
rated current to determine an overload condition.
When 08-05 = x0xxb, overload protection function is based on 70% of the motor rated current for an output
frequency of 20Hz. If the output frequency is lower than 1Hz, the overload protection function uses 40% of the
motor rated current to determine an overload condition.
Motor overload rating at different output frequencies is shown at Figure 4.4.72.
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