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5. Speed Control
5.9 Troubleshooting in the speed control
1
2
3
4
5
6
7
8
9
10
Parameters referred to
Pr.72 PWM frequency selection
Pr.80 Motor capacity, Pr.81 Number of motor poles
Pr.125 Terminal 2 frequency setting gain frequency, Pr.126 Terminal 4 frequency setting gain frequency
Pr.359 Encoder rotation direction, Pr.369 Number of encoder pulses
Pr.822 Speed setting filter 1
Pr.824 Torque control P gain 1 (current loop proportional gain)
4
Motor speed
fluctuates.
Speed command varies.
• Check that the speed command sent from the controller is correct. (Take EMC
measures.)
• Set
Pr.72
lower.
• Set
Pr.822 Speed setting filter 1
higher. (Refer to
.)
Torque shortage.
• Raise the torque limit.
(Refer to the torque limit for speed control on
Speed control gain is not
suitable for the machine.
(Resonance occurs.)
• Adjust
Pr.820 Speed control P gain 1
and
Pr.821 Speed control integral time
1
.
5
Hunting (vibration or
acoustic noise)
occurs in the motor
or the machine.
Speed control gain is too
high.
• Set
Pr.820
lower and
Pr.821
higher.
Torque control gain is
too high.
• Set
Pr.824 Torque control P gain 1 (current loop proportional gain)
lower.
Motor wiring is incorrect. • Check the wiring.
6
Acceleration/
deceleration time is
different from the
setting.
Torque shortage.
• Raise the torque limit.
(Refer to the torque limit for speed control on
Load inertia is too high.
• Set acceleration/deceleration time suitable for the load.
7
Machine movement
is unstable.
Speed control gain is not
suitable for the machine.
• Adjust
Pr.820 and Pr.821
.
Response is slow
because of the inverter's
acceleration/
deceleration time
setting.
• Set the optimum acceleration/deceleration time.
8
Rotation ripple
occurs during the
low-speed operation.
High carrier frequency is
affecting the motor
rotation.
• Set
Pr.72
lower.
Speed control gain is too
low.
• Set
Pr.820
higher.
No.
Condition
Possible cause
Countermeasure
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 ...