Excitation Ratio (Pr. 854) - Mitsubishi Electric FR-A720-0.4K 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 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 [%]
4
145