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ELECTRONIC THERMAL DETECTION (EtH)
H31: EtH Selection (Factory Default: 1: Active)
Range:0: Inactive
1: Active
H32: EtH Level (Factory Default: 150%)
Range:30 - 150%
H33: Motor Type Selection (Factory Default: 0: General)
Range:0: General
1: Special
This function is used to compensate for excessive motor heat generated during
continuous low frequency operation. This is especially true if the capacity of the
hoist motor is lower than that of the inverter. To prevent the motor from overheating,
the EtH level must be set according to the provided formula.
EtH level (%) = K x (Motor rated current / Inverter rated current) x 100%
(K = 1.0 for 50Hz Input Frequency, K = 1.1 for 60 Hz Input Frequency)
Once the EtH level is found, then the motor type of the hoist must be determined.
There are two electronic thermal characteristics, one is a General, a standard AC
induction motor, the other is Special, for a motor containing a forced air blower.
Once the correct values are programmed, the drive will determine the EtH time for
either the General or Special motor.
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