4-2 Function Mode Overcurrent Suppression Function •This function suppresses overcurrent caused by a steep current rise in rapid acceleration. •Select to enable or disable the overcurrent suppression function in b140. •This function does not operate during deceleration. 4 Functions Automatic Carrier Frequency Reduction Function This function automatically lowers the set carrier frequency when the temperature of the semiconductor inside the Inverter becomes high. •While this function is activated, the noise from the motor may be heard differently because of automatic change in career frequency.
RDY (Ready) Function This function prepares for Inverter output to rotate the motor immediately after a RUN command is input. When this function is enabled and the RDY signal is sent to the multi-function input terminal, high voltage is applied to terminals U, V, and W on the main circuit terminal block. This happens even if the motor is stopped with the RUN command turned off. Do not touch the main circuit terminal block. 4-42 Parameter No. Function name Data Default setting Unit b140 Overcurrent suppression function 00: Disabled 01:
Enabled 01 ⎯ Output Desired frequency Actual acceleration after suppression operation Time Output current Suppression level (about 160% of the rating) Time Desired Actual acceleration after suppression operation Time Parameter No. Function name Data Default setting Unit b150 Automatic carrier reduction 00: Disabled 01: Enabled 00 ⎯ Parameter No. Function name Data Default setting Unit b151 Ready function selection 00: Disabled 01: Enabled 00 ⎯