4-2 Function Mode Electronic Thermal Function •This function electronically protects the motor from overheating. 4 Functions * To switch to the 2nd control, allocate 08 (SET) to the multi-function input and then turn it on. •Causes an overload trip (E06) to protect the motor from overheating by setting according to the motor rated current. •Provides the most appropriate protection characteristics, taking into account the decline of the motor cooling capability at a low speed. •To set a value over the rated current of the motor, be careful of any temperature rise of the motor. „ Electronic Thermal Level (Motor Protection Level) (Example) 3G3MX-A2007 Rated current: 5.0 A Setting range:
1.0 to 6.0 A •The following figure shows the time limit characteristics with the electronic thermal level (b012) set to 5.0 A. Trip time (s) 60 4 0 5.8 (116%) 7.5 (150%) 10.0 (200%) Motor current (A) (Ratio to the rated current of the Inverter) „ Electronic Thermal Characteristics •Frequency characteristics are multiplied by the b012/212 set value shown above. •The lower the output frequency is, the lower the cooling capability of the standard motor's self- cooling fan. 4-27 Parameter No.
Function name Data Default setting Unit b012 Electronic thermal level 0.2 × Rated current to 1.2 × Rated current Rated current A b212 * 2nd electronic thermal level Rated current A b013 Electronic thermal characteristics selection 00: Reduced torque characteristics 1 01: Constant torque characteristics 02: Reduced torque characteristics 2 00 b213 * 2nd electronic thermal characteristics selection Related functions C021 to C022, C026