Excitation Ratio; Gain Adjustment Of Current Controllers For The D Axis And The Q Axis - Mitsubishi FR-A800 Instruction Manual

Real sensorless vector control, vector control, PM sensorless vector control adjustment
5.6.2

Excitation ratio

The excitation ratio can be lowered to enhance efficiency for light loads. (Motor magnetic noise can be reduced.)
Pr. Name
854
Excitation ratio
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/decelerate repeatedly up to high
speed.
Excitation ratio
[%]
100
(Initial value)
Pr.854
setting
0
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).
5.6.3
Gain adjustment of current controllers for the d
axis and the q axis
The gain of the current controller can be adjusted.
Pr. Name
Torque control P gain 1
824
(current loop
G213
proportional gain)
Torque control integral
825
time 1 (current loop
G214
integral time)
• Use Pr.824 Torque control P gain 1 (current loop proportional gain) to adjust the proportional gain of current controllers
for the d axis and the q axis. The 100% gain is equivalent to 1000 rad/s. Setting this parameter higher improves the
trackability for current command changes. It also reduces the current fluctuation caused by external disturbance.
• Use Pr.825 Torque control integral time 1 (current loop integral time) to set the integral time of current controllers for
the d axis and the q axis. If the setting value is small, it produces current fluctuation toward disturbance, decreasing time
until it returns to original current value.
NOTE
• Pr.834 Torque control P gain 2 and Pr.835 Torque control integral time 2 are valid when terminal RT is ON. In this case,
replace them for Pr.824 and Pr.825 in the description above.
Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Vector Sensorless Sensorless Vector Vector
Initial Setting
value range
100% 0 to 100%
100 Load[%]
PM PM PM
Initial Setting
value range
100% 0 to 500%
5 ms 0 to 500 ms
Description
Set an excitation ratio when there is no load.
Description
The proportional gain of the current controller is set.
The integral time of the current controller is set.
PARAMETERS
5
255