Troubleshooting - Mitsubishi Electric FR-V500 Instruction Manual

2.7.11 Troubleshooting

Phenomenon
1 Motor does not rotate. (1) The phase sequence of the
2 Position shift occurs.
3 Motor or machine
hunts.
4 Machine operation is
unstable.
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.)
Cause
motor or encoder wiring is
wrong.
(2) The control mode selection, Pr.
800, setting is improper.
(3) The servo on signal or start
signal (STF, STR) is not input.
(4) The command pulses are not
input correctly. (FR-V5AP)
(5) The position command source
selection, Pr. 419, setting is not
correct.
(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.
(1) The command pulses are not
input correctly.
(2) The command is affected by
noise or the encoder feedback
is compounded with noise.
(1) The position loop gain is high.
(2) The speed loop gain is high.
(1) The acceleration/deceleration
time setting has adverse effect.
Position control (Pr. 419 to Pr. 430,
Corrective Action
(1) Check the wiring. (Refer to page 55)
(2) Check the Pr. 800 setting. (Factory setting is speed
control)
(3) Check that the signals are input normally.
(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) Check the position command source selection in
Pr. 419.
(6) Check the position feed amounts in Pr. 465 to Pr. 494.
(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)-1 Decrease the PWM carrier frequency in Pr. 72.
(2)-2 Change the shielded cable earthing (grounding)
place or raise the cable.
(1) Decrease Pr. 422.
(2)-1 Perform easy gain tuning.
(2)-2 Decrease Pr. 820 and increase Pr. 821.
(1) Decrease Pr. 7 and Pr. 8.
63
Pr. 464 to Pr. 494)
2