4.7 Setup Troubleshooting and Possible Solutions
Problem
Control Mode and Possible Cause
Corrective Action
Motor or m achine vibrates in
the low or medium speed
range.
V /f
Output voltage is too high.
Reduce the V /f Pattern settings (E1-08, E1-10).
OLV
Torque compensation is responding too quickly.
Increase the Torque Compensation D elay Time (C4-02).
Output voltage is too high.
Reduce the V /f Pattern settings (E1-08, E1-10).
OLV
CLV
The value for the motor slip is set incorrectly.
Check the Motor Slip value in parameter E2-02. Increase or decrease it in
steps o f 0.2 Hz.
CLV
CLV/PM
Speed control loop adjusted with too much gain.
• D ecrease C5-01 and then increase C5-02 i f the problem occurs at speed
higher than C5-07.
• D ecrease C5-03 and then increase C5-04 i f the problem occurs at speed
lower than C5-07.
• D ecrease C5-13 and then increase C5-14 i f the problem occurs at speed
lower than C 5-07 but only during deceleration.
Motor or m achine vibrates in
During Position Lock.
CLV
CLV/PM
The Position Lock control loop does not respond fast enough.
• If vibration occurs at During Position Lock at start, first decrease S3-02. If
decreasing S3-02 does not resolve the problem, decrease S3-01.
• D ecrease S3-03 if vibration occurs During Position Lock at stop.
The speed control is not responding quickly enough when the
brake is released.
D ecrease C5-19 and then increase C5-20.
Vibrations with the fre
quency equal to the motor
speed occur.
CLV
CLV/PM
Encoder vibrates.
Check the encoder mounting and the alignment o f encoder and motor shaft.
A ll
M echanical problems.
Check bearings and gearbox.
Rotational parts (motor armature, handwheel, brake disk/
drum) are not properly balanced.
Properly balance rotating parts.
Oscillations when using an
analog speed reference.
A ll
The analog reference value is not stable or the signal is noisy.
• Check the analog signal line connection. U se shielded twisted pair cables.
• A pply a filter to the analog input signal by setting parameter H3-13.
Top speed is different in
motoring and regenerative
mode.
OLV
Slip Compensation during Regenerative operation is switched
off.
Make sure C 3-04 is set properly and set parameter C3-05 to 0.
Speed reference and motor
speed do not match when
using an analog reference
signal.
A ll
The drives analog input is not set according to the signal level
o f the controller speed reference output signal.
Check the gain and bias settings for the analog input that is used to set the
speed reference. Check parameters H 3-03 and H 3-04 for input A 1, check
parameters H 3-11 and H 3-12 for input A2.
Acceleration is longer than
set to C 1 -D D parameters.
A ll
The load is too high.
• Check if the acceleration rate set is not too high (acceleration tim e is too
short).
• Make sure the drive rated current is enough to fulfill the application
requirements.
• M ake sure the load is not seized, car guide lubrication is ok, etc.
V /f and OLV
The load is too high and the current/torque exceeds the stall
prevention level.
Check if the Stall Prevention L evel at Acceleration in L3-03 is not set too
small.
OLV, CLV
CLV/PM
The load is too high and the torque exceeds the drives torque
limits.
Check it the Torque Limit parameters L 7 -D D are not set too low.
Motor speed does not match
the speed reference at con
stant speed.
A ll
The load is too high.
Make sure the drive rated current is enough to fulfill the application require
ments.
V /f
The load is too high and the current/torque exceeds the stall
prevention level.
Check if the Stall Prevention L evel During Run in L3-06 is not set too low.
OLV, CLV
CLV/PM
The load is too high and the torque exceeds the torque limits.
Check it the Torque Limit parameters L 7 -D D are not set too low.
High frequency acoustic
noise from the motor.
A ll
The carrier frequency is too low.
Increase the Carrier Frequency in parameter C6-03. If the carrier frequency is
set higher than the default setting, a current derating must be considered.
YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual
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