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Position control by vector control
(3) Troubleshooting (Position)
Phenomenon Cause Countermeasures
1 Motor does not rotate.
(1) The phase sequence of the
motor or encoder wiring is
wrong.
(1) Check the wiring. (Refer to page 36 )
(2) The control mode selection Pr.
800 setting is improper.
(2) Check the Pr. 800 setting. (Refer to page 92 )
(3) The servo ON signal or stroke
end signal (STF, STR) is not
input.
(3) Check that the signals are input normally.
(4) Command pulse, position pulse
sign (NP) are not correctly
input.
(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.
(4)-3 Check that the position pulse sign (NP) is assigned
to the input terminal. (inverter pulse input)
(5) Pr. 419 Position command source
selection setting is not correct.
(5) Check the position command source selection in Pr.
419.
(6) When "0" is set in Pr. 419
Position command source
selection, the settings of position
feed amount in Pr. 465 to Pr. 494
are not correct.
(6) Check the position feed amount 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 )
(1)-3 Check that the position pulse sign (NP) is assigned
to the input terminal. (inverter pulse input)
(2) The command is affected by
noise. Or the encoder feedback
signal is compounded with
noise.
(2)-1 Decrease the Pr. 72 PWM frequency selection value.
(2)-2 Change the earthing (grounding) point of shielded
wire. Or leave the cable suspended.
3 Motor or machine hunts.
(1) The position loop gain is high. (1) Decrease the Pr. 422 value.
(2) The speed 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 .
♦Parameters referred to♦
Pr. 7 Acceleration time Refer to page 172
Pr. 8 Deceleration time Refer to page 172
Pr. 72 PWM frequency selection Refer to page 284
Pr. 800 Control method selection
Refer to page 92
Pr. 802 Pre-excitation selection
Refer to page 203
Pr. 819 Easy gain tuning selection
Refer to page 105
Pr. 820 Speed control P gain 1 Refer to page 105
Pr. 821 Speed control integral time 1 Refer to page 105