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Position control (Pr. 419 to Pr. 430,
Pr. 464 to Pr. 494)
VECTOR CONTROL
2
2.7.11 Troubleshooting
Phenomenon Cause Corrective Action
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.
Related parameter reference pages
• 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.)