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Basic Functions
3.3.3 Base frequency (Pr. 3)
<Setting>
•In Pr. 3, set the base frequency (motor's rated frequency).
When running the standard motor, generally set the "base frequency" to the rated
frequency of the motor. When running the motor using commercial power supply-
inverter switch-over operation, set the base frequency to the same value as the
power supply frequency.
When the frequency given on the motor's rating plate is only "50Hz", always set the
"base frequency" to "50Hz".
Leaving the base frequency unchanged from "60Hz" may make the voltage too low
and the torque insufficient, resulting in an overload trip.
Used to adjust the inverter output
(frequency) to the motor rating.
Parame
ter
Name
Factory
Setting
Setting
Range
3 Base frequency 60Hz 0 to 120Hz
CAUTION
Set 60Hz in Pr. 3 "base frequency" when using a Mitsubishi constant-torque motor.
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Related parameters
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• Motor setting
⇒
Pr. 71 "applied motor" (refer to page 70)
Pr.3
Power supply
voltage
Output frequency
(Hz)