Справочник Пользователя для Mitsubishi Electronics FR-V540-1.5K to 55K

54

For online auto tuning, refer to the Instruction

 

Manual (basic)

1

Torque control is not 
exercised normally.

(1) The phase sequence of the 

motor or encoder wiring is 
wrong.

(1) Check the wiring. (Refer to the Instruction Manual 

(basic).)

(2) The control mode selection, Pr. 

800, setting is improper.

(2) Check the Pr. 800 setting. (The factory setting is 

speed control)

(3) The speed limit value is not 

input.

(3) Set the speed limit value. (If the speed limit value 

is not input, the motor will not rotate since the 
speed limit value is regarded as 0r/min.)

(4) The torque command varies.

(4) Check that the command device gives a correct 

torque command.

      ‚ Decrease the PWM carrier frequency in Pr. 72.
      ‚ Increase the torque setting filter in Pr. 826.

(5) Torque variation due to the 

change in the motor 
temperature.

(5) Set the adaptive magnetic flux observer in Pr. 95.

(6) The torque command does not 

match the inverter-recognized 
value.

(6) Recalibrate the torque command bias and gain in 

Pr. 904 and Pr. 905.

2

When the torque 
command is small, the 
motor rotates in the 
direction opposite to the 
start signal.

The offset calibration of the torque 
command does not match.

Recalibrate the torque command bias in Pr. 904.

3

Normal torque control 
cannot be exercised 
during acceleration/
deceleration.
The motor vibrates.

Since the speed limit value 
changes with the setting of the 
acceleration/deceleration time in 
Pr. 7, Pr. 8, the speed limit may be 
activated. (When the speed limit is 
activated, torque control cannot be 
exercised.)

Reduce the acceleration/deceleration time.
Alternatively, set the acceleration/deceleration time to 
0. (Speed limit during acceleration/deceleration is 
speed limit during constant speed)

4

Output torque is not linear 
in response to the torque 
command.

Insufficient torque.

Return the excitation ratio to the factory setting.

• Pr. 7 "acceleration time" (Refer to page 78.)
• Pr. 8 "deceleration time" (Refer to page 78.)
• Pr. 800 "control system selection" (Refer to page 169.)
• Pr. 802 "pre-excitation selection" 

(Refer to page 82.)

• Pr. 810 "torque limit input method selection" (Refer to page 87.)
• Pr. 826 "torque setting filter 1" (Refer to page 176.)
• Pr. 904 "torque command terminal 3 bias" (Refer to page 190.)
• Pr. 905 "torque command terminal 3 gain" (Refer to page 190.)