Mitsubishi Electric FR-A800, Instruction Manual

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Parameters Real sensorless vector control, vector control, PM sensorless vector control adjustment
FR-A800 5 - 187
5.6.2 Excitation ratio
The excitation ratio can be lowered to enhance efficiency for light loads. (Motor magnetic noise can
be reduced.)
●
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.
Pr. Name
Initial
value
Setting
range
Description
854
G217
Excitation ratio 100% 0 to 100% Set an excitation ratio when there is no load.
I001543E
Fig. 5-74: Setting of the excitation ratio
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).
Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Vector Vector Vector
Excitation ratio [%]
100
(initial value)
Pr. 854
setting
0 100 Load [%]