0: No protection
1: Common motor (with low speed
compensation). Because the heat-releasing
effect of the common motors will be weakened,
the corresponding electric heat protection will be
adjusted properly. The low speed compensation
characteristic mentioned here means reducing
the threshold of the overload protection of the
motor whose running frequency is below 30Hz.
2: Frequency conversion motor (without low
speed compensation). Because the
heat-releasing of the specific motors won't be
impacted by the rotation speed, it is not
necessary to adjust the protection value during
low-speed running.