4-42
4-2 Function Mode
4
Functions
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.
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.
Parameter No. Function name Data Default setting Unit
b140
Overcurrent suppression
function
00: Disabled
01: Enabled
01 ⎯
Output
frequency
Desired
Actual acceleration after
suppression operation
Time
Output
current
Time
Suppression level
(about 160% of the rating)
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 ⎯
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