Mitsubishi Electronics FR-V540-1.5K to 55K ユーザーズマニュアル

63

1

Motor does not rotate. (1) The phase sequence of the 

motor or encoder wiring is 
wrong.

(1) Check the wiring. (Refer to page 55)

(2) The control mode selection, Pr. 

800, setting is improper.

(2) Check the Pr. 800 setting. (Factory setting is speed 

control)

(3) The servo on signal or start 

signal (STF, STR) is not input.

(3) Check that the signals are input normally.

(4) The command pulses are not 

input correctly. (FR-V5AP)

(4)-1

Check that the command pulses are input 
normally. (Check the cumulative command pulse 
value in Pr. 430.)

(4)-2

Check the command pulse form and command 
pulse selection, Pr. 428, setting.

(5) The position command source 

selection, Pr. 419, setting is not 
correct.

(5) Check the position command source selection in 

 

Pr. 419.

(6) When the position command 

source selection, Pr. 419, 
setting is 0, the position feed 
amount, Pr. 465 to Pr. 494, 
settings are not correct.

(6) Check the position feed amounts in Pr. 465 to Pr. 494.

2

Position shift occurs.

(1) The command pulses are not 

input correctly.

(1)-1

Check the command pulse form and command 
pulse selection, Pr. 428, setting.

(1)-2

Check that the command pulses are input 
normally. (Check the cumulative command pulse 
value in Pr. 430.)

(2) The command is affected by 

noise or the encoder feedback 
is compounded with noise.

(2)-1

Decrease the PWM carrier frequency in Pr. 72.

(2)-2

Change the shielded cable earthing (grounding) 
place or raise the cable.

3

Motor or machine 
hunts.

(1) The position loop gain is high.

(1)

Decrease Pr. 422.

(2) The speed loop gain is high.

(2)-1

Perform easy gain tuning.

(2)-2

Decrease Pr. 820 and increase Pr. 821.

4

Machine operation is 
unstable.

(1) The acceleration/deceleration 

time setting has adverse effect.

(1) Decrease Pr. 7 and Pr. 8.

• Pr. 800 "control system selection" (Refer to page 169.)
• Pr. 802 "pre-excitation selection" (Refer to page 82.)
• Pr. 820 "speed control P gain 1" (Refer to page 175.)
• Pr. 7 "acceleration time" (Refer to page 78.)
• Pr. 8 "deceleration time" (Refer to page 78.)
• Pr. 72 "PWM frequency selection" (Refer to page 112.)
• Pr. 821 "speed control integral time 1" (Refer to page 175.)