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Adjusting The Speed Control Gain (pr.820, Pr.821)
Air-conditioning inverter.
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IPM motor control <IPM>
4.3.4
Adjusting the speed control gain (Pr.820, Pr.821)
Manual adjustment of gain is useful to exhibit the optimum performance of the machine or to improve unfavorable
conditions such as vibration and acoustic noise during the operation with high load inertia or gear backlashes.
Parameter
Number
820
Speed control P gain 1
821
Speed control integral time 1
The above parameters can be set when Pr.160 User group read selection = "0." (Refer to page 197)
(1)
Adjusting the speed control gain manually
The speed control gain can be adjusted for the conditions such as abnormal machine vibration, acoustic noise, slow
response, and overshoot.
Proportional gain
200rad/s
50rad/s
100%
25%
(Initial setting)
Actual speed gain is calculated as below when load inertia is applied.
Load fluctuation
Speed
Actual speed gain = Speed gain of a single
90
Initial
Name
value
25%
0.333s
Pr.820 Speed control P gain 1 = "25% (initial setting)" is equivalent to
50rad/s (speed response of a single motor). Setting this parameter
higher speeds up the response, but setting this too high causes vibration
and acoustic noise.
Setting Pr.821 Speed control integral time 1 lower shortens the return time
Pr.820
to the original speed at a speed fluctuation, but setting it too low causes
Setting
overshoot.
Setting the integral time lower shortens the return time here.
motor
JM+JL
IPM
IPM
IPM
Setting
range
The proportional gain during speed control is set.
(Setting this parameter higher improves the trackability
0 to 1000%
for speed command changes. It also reduces the speed
fluctuation due to a load fluctuation.)
The integral time during speed control is set. (Setting
this parameter lower shortens the return time to the
0 to 20s
original speed when the speed fluctuates due to a load
fluctuation.)
Setting the proportional gain higher
speeds up the response and reduces the speed fluctuation here.
JM
JM: Motor inertia
JL: Load inertia converted as the motor axis inertia
< I P M >
Operation

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