Справочник Пользователя для Mitsubishi Electronics FR-A720-0.4k to 90k

The speed command of position control relates to speed control. (Refer to page 98 )

Motor or machine is 

hunting.

Y

N

The position loop gain 

(Pr. 422) is high.

Decrease 
the position loop gain 
(Pr. 422).

Set the electronic gear.
(Pr. 420, Pr. 421)

N

Have you made 

the electronic gear 

setting?

Y

Y

N

Perform easy gain tuning. 
The speed control gain is high.
Decrease the speed control 
proportional gain (Pr. 820). 
Increase the speed control 
integral time (Pr. 821).

Machine operation is 

unstable.

Y

N

Do not turn off the forward 
(reverse) rotation stroke end 
signal before completion of 
positioning.

Y

The forward (reverse) 

rotation stroke end signal has 

turned off before completion 

of positioning.

N

Y

Position shift occurs.

N

Insufficient torque. 
Increase the excitation 
ratio (Pr. 854).

Check the speed 
control measures.

N

Y

Position control is not 
exercised normally

Have you checked 

the speed control items?

Please contact your sales 
representative.