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6. Torque Control
6.7 Troubleshooting in torque control
1
2
3
4
5
6
7
8
9
10
6.7
Troubleshooting in torque control
Parameters referred to
Pr.72 PWM frequency selection
Pr.178 to Pr.189 (Input terminal function selection)
Pr.800 Control method selection
Pr.807 Speed limit selection
C38 (Pr.932) to C41 (Pr.933) (torque setting voltage (current) bias/gain)
No.
Condition
Possible cause
Countermeasure
1
Torque control does not
operate properly.
• There is incorrect phase sequence
between the motor wiring and
encoder wiring.
• Check the wiring. (Refer to the Instruction Manual
(Connection).)
•
Pr.800 Control method selection
is not appropriate.
• Check the
Pr.800
setting. (Refer to
• The speed limit value has not been
input.
• Set the speed limit value. (If speed limit value is not input, it
becomes 0 Hz by default and the motor does not run.)
• Torque command varies.
• 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.
• The torque command and the torque
recognized by the inverter are
different.
• Re-calibrate
C38 (Pr.932) Terminal 4 bias command
(torque/magnetic flux), C39 (Pr.932) Terminal 4 bias
(torque/magnetic flux), C40 (Pr.933) Terminal 4 gain
command (torque/magnetic flux), and C41 (Pr.933)
Terminal 4 gain (torque/magnetic flux)
2
When a small torque
command is given, the
motor rotates in a
direction opposite to the
start signal.
• Torque offset calibration is
inaccurate.
• Re-calibrate
C38 (Pr.932) and C39 (Pr.932)
. (Refer to
3
Torque control cannot
operate normally during
acceleration/
deceleration.
The motor vibrates.
• 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".)
• 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.)
4
Output torque is
nonlinear for the torque
command.
• Torque shortage.
• Reset
Pr.854 Excitation ratio
to the initial value.
Sensorless
Sensorless
Sensorless
Vector
Vector
Vector
Summary of Contents for FR-E800
Page 17: ...16 1 Introduction 1 3 Related manuals MEMO ...
Page 51: ...50 2 Basic Operation 2 8 I O terminal function assignment MEMO ...
Page 89: ...88 3 Parameters 3 4 Parameter list by function group number MEMO ...
Page 135: ...134 5 Speed Control 5 9 Troubleshooting in the speed control MEMO ...
Page 153: ...152 6 Torque Control 6 7 Troubleshooting in torque control MEMO ...
Page 195: ...194 8 E Environment Setting Parameters 8 18 Current average value monitor signal MEMO ...
Page 237: ...236 10 D Operation Command and Frequency Command 10 6 Operation by multi speed setting MEMO ...
Page 339: ...338 13 T Multi Function Input Terminal Parameters 13 9 Start signal operation selection MEMO ...
Page 455: ...454 16 G Control Parameters 16 13 Speed smoothing control MEMO ...
