Excitation Ratio - Mitsubishi Electric FR-A820-00046 Instruction Manual

Parameters
5.6.2

Excitation ratio

The excitation ratio can be lowered to enhance efficiency for light loads. (Motor magnetic noise can
be reduced.)
Pr.
854
G217
● When excitation ratio is reduced, output torque startup is less responsive.
This function is suitable for applications such as machine tools that suddenly accelerate/deceler-
ate repeatedly up to high speed.
Fig. 5-74:
NOTE The setting of Pr. 854 is invalid if Pr. 858 "Terminal 4 function assignment" or Pr. 868 "Terminal 1
function assignment" is set to "1" (flux command according to terminal).
FR-A800
Real sensorless vector control, vector control, PM sensorless vector control adjustment
Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless
Sensorless Sensorless Sensorless Vector Vector Vector
Name
Excitation ratio
Excitation ratio [%]
100
(initial value)
Pr. 854
setting
0
Setting of the excitation ratio
Initial Setting
Description
value range
100% 0 to 100% Set an excitation ratio when there is no load.
100 Load [%]
I001543E
5 - 187