Excitation Ratio (Pr. 854) - Mitsubishi Electric FR-A740-00023 Instruction Manual

4.7.2

Excitation ratio (Pr. 854)

Decrease the excitation ratio when you want to improve efficiency under light load. (Motor magnetic noise
decreases.)
Parameter
Name
Number
854 Excitation ratio
⋅ Note that the rise of output torque becomes slow if
excitation ratio is decreased.
This function is appropriate for applications as machine
tools which repeat rapid acceleration/deceleration up to
high speed.
REMARKS
⋅ When "1" (magnetic flux with terminal) is set in Pr. 858 Terminal 4 function assignment or Pr. 868 Terminal 1 function assignment, the
Pr. 854 setting is made invalid.
Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Vector Vector Vector
Initial Value Setting Range
100% 0 to 100%
Excitation
ratio [%]
(initial value)
Pr. 854
set value
Adjustment of real sensorless vector
control, vector control
Description
Set the excitation ratio under no load.
100
0 100 Load [%]
137
4