4-2 Function Mode „ Electronic Thermal Level (Motor Protection Level) (Example) 3G3JX-A2007 Rated current: 4.0 A Setting range: 0.8 to 4.0A Time before trip (s) Example where electronic thermal level is b012 = 5.0 A 60 0 4.6 (116%) 6.0 (150%) 8.0 (200%) 4 Motor current (A) (Ratio to the rated current of the Inverter) 4 „ Electronic Thermal Characteristics •Frequency characteristics are multiplied by the b012/212 set value above. •The lower the output frequency is, the lower the cooling capability of the standard motor's self- cooling fan. Functions Reduced Torque Characteristics 1 •Multiplied by the time limit characteristics set in b012/212 for each frequency.
(Example) 3G3JX-A2007 (Rated current: 4.0 A), b012 = 4.00 (A), Output frequency = 20 Hz Electronic thermal level Trip time (s) X1.0 X0.8 X0.6 60 0 5 20 60 Inverter output frequency (Hz) 0 3.7 (92.8%) 4.8 (120%) 6.4 (160%) 4 Motor current (A) (Ratio to the rated current of the Inverter) Constant Torque Characteristics •Do not skip this setting when using a constant torque motor. •Multiplied by the time limit characteristics set in b012/212 for each frequency. (Example) 3G3JX-A2007 (Rated current:
4.0 A), b012 = 4.00 (A), Output frequency = 2.5 Hz Electronic thermal level Trip time (s) X1.0 X0.667 60 0 5 60 Inverter output frequency (Hz) 4 Motor current (A) (Ratio to the rated current of the Inverter) 0 3.1 (77.4%) 4.0 (100%) 5.32 (133%) 4-30