6.6
Troubleshooting in torque control
Sensorless
Sensorless
Sensorless
Condition
Torque control does not
1
operate properly.
When a small torque
command is given, the
2
motor rotates in a
direction opposite to the
start signal.
Torque control cannot
operate normally during
3
acceleration/
deceleration.
The motor vibrates.
Parameters referred to
Pr.72 PWM frequency
selectionpage 146
Pr.178 to Pr.189 (Input terminal function
Pr.800 Control method
selectionpage 86
Pr.807 Speed limit
selectionpage 120
C38 to C41 (torque setting voltage (current)
124
6. Torque control
6.6 Troubleshooting in torque control
Possible cause
• Motor wiring is incorrect.
• Pr.800 Control method selection
is not appropriate.
• The speed limit value has not been
input.
• Torque command varies.
• The torque command and the torque
recognized by the inverter are
different.
• Torque offset calibration is
inaccurate.
• Speed limit is operating.
(Speed limit may operate because
the speed limit value will increase or
decrease according to acceleration/
deceleration time setting of Pr.7 and
Pr.8 when Pr.807 = "0".)
selection)page 283
bias/gain)page 278
Countermeasure
• Check the wiring. (Refer to the Instruction Manual
(Connection).)
• Check the Pr.800 setting. (Refer to
• Set the speed limit value. (If speed limit value is not input, it
becomes 0 Hz by default and the motor does not run.)
• Check that the torque command sent from the controller is
correct.
• Set Pr.72 PWM frequency selection lower.
• Set Pr.826 Torque setting filter 1 higher.
• Re-calibrate C38 Terminal 4 bias command (torque/
magnetic flux), C39 Terminal 4 bias (torque/magnetic
flux), C40 Terminal 4 gain command (torque/magnetic
flux), C41 Terminal 4 gain (torque/magnetic flux). (Refer to
page
278.)
• Re-calibrate C38 and C39. (Refer to
• Set the acceleration/deceleration time shorter.
Alternatively, set "0" for the acceleration/deceleration time.
(Forward/reverse rotation speed limit at this time is the value
at a constant speed.)
page
86.)
page
278.)