Excitation Ratio - Mitsubishi Electric FR-A700 Instruction Manual

Adjustment of real sensorless vector control, vector control
6.6.2

Excitation ratio

Decrease the excitation ratio when you want to improve efficiency under light load. (Motor
magnetic noise decreases.)
Pr.
Name
No.
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.
Fig. 6-44: Setting of the excitation ratio
NOTE
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.
6 - 146
Sensorless Sensorless Sensorless Vector Vector Vector
Initial
Setting Range Description
Value
Set the excitation ratio under no
100% 0–100%
load.
Excitation ratio [%]
100
(initial value)
Pr. 854
set value
0
Parameters referred to
—
100% Last [%]
Parameter
Refer to
Section
I001543E