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Troubleshooting - Mitsubishi Electric FR-V560 Instruction Manual

Vector inverter.
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3.2.4

Troubleshooting

Phenomenon
Motor does not run at
correct speed.
(Speed command does
not match actual speed)
1
Speed does not rise to
the speed command.
2
Motor speed is
unstable.
3
Motor or machine hunts
(vibration/noise is
4
produced).
Acceleration/
deceleration time does
not match the setting.
5
Machine operation is
unstable
6
Speed fluctuates at low
speed.
7
Motor does not
8
decelerate
Related parameter reference pages
• Pr. 71 "applied motor" (Refer to page 123.)
• Pr. 72 "PWM frequency selection" (Refer to page 124.)
• Pr. 800 "control system selection" (Refer to page 182.)
• Pr. 820 "speed control P gain 1" (Refer to page 187.)
• Pr. 821 "speed control integral time 1" (Refer to page 187.)
• Pr. 822 "speed setting filter 1" (Refer to page 187.)
• Pr. 851 "number of encoder pulses" (Refer to page 10.)
• Pr. 854 "excitation ratio" (Refer to page 193.)
• Pr. 902 "speed setting No. 2 bias" (Refer to page 202.)
• Pr. 903 "speed setting No. 2 gain" (Refer to page 202.)
• Pr. 917 "No. 1 terminal bias (speed)" (Refer to page 202.)
• Pr. 918 "No. 1 terminal gain (speed)" (Refer to page 202.)
Cause
(1) The speed command from the
command device is incorrect.
The speed command is
compounded with noise.
(2) The speed command value does
not match the inverter-recognized
value.
(1) Insufficient torque.
Torque restriction is actuated.
(2) Only P (proportional) control is
selected.
(1) The speed command varies.
(2) Insufficient torque.
(3) The speed control gains do not
match the machine.
(machine resonance)
(1)The speed control gain is high.
(2) High torque control gain.
(1) Insufficient torque.
(2) Large load inertia.
(1) The speed control gains do not
match the machine.
(2) Slow response because of
improper acceleration/
deceleration time of the inverter.
(1) Adverse effect of high carrier
frequency.
(2) Adverse effect of weak excitation.
(3) Low speed control gain.
The error between R1 of the motor
and R1 of the inverter is excessive.
(E.11 error)
71
Fine adjustment of gains for speed
control (without encoder)
Corrective Action
(1) Check that a correct speed command comes from
the command device.
Decrease the PWM carrier frequency in Pr. 72.
(2) Readjust the speed command bias and gain in Pr.
902, Pr. 903, Pr. 917, and Pr. 918.
(1)-1
Increase the torque restriction value.
(
Refer to the torque restriction of speed
control in the Instruction Manual (basic).)
(1)-2
Insufficient capacity
(2)
When the load is heavy, speed deviation will
occur under P (proportional) control. Select PI
control.
(1)-1
Check that a correct speed command comes
from the command device. (Take measures
against noises.)
(1)-2
Decrease the PWM carrier frequency in Pr.
72.
(1)-3
Increase the speed setting filter in Pr. 822.
(2)-1
Increase the torque restriction value.
(
Refer to the torque restriction of speed
control in the Instruction Manual (basic).)
(2)-2
Return the excitation ratio in Pr. 854 to the
factory setting (100%).
(3)-1
Adjust Pr. 820 and Pr. 821. (Refer to page 48.)
(3)-2
Perform speed feed forward control.
(1)-1
Decrease Pr. 820 and increase Pr. 821.
(1)-2
Perform speed feed forward control.
(2)
Decrease Pr. 824. (Refer to page 55.)
(1)-1
Increase the torque restriction value.
(
Refer to the torque restriction of speed
control in the Instruction Manual (basic).)
(1)-2
Return the excitation ratio in Pr. 854 to the
factory setting.
(1)-3
Perform speed feed forward control.
(2)
Set the acceleration/deceleration time that
meets the load.
(1)-1
Adjust Pr. 820 and Pr. 821. (Refer to page 70.)
(1)-2
Perform speed feed forward control.
(2)
Change the acceleration/deceleration time to
an optimum value.
(1) Decrease the PWM carrier frequency in Pr. 72.
(2) Return the excitation ratio in Pr. 854 to the factory
setting.
(3) Increase Pr. 820 "speed control P gain".
Perform offline auto tuning again and perform start
time tuning.
3

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