YASKAWA Lift Inverter L1000V, Technical Manual

Page: 97 / 282

4.7 Setup Troubleshooting and Possible Solutions
YASKAWA EUROPE SIEP YASKAWA AC Drive L1000V Technical Manual 97
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Riding Comfort Related Problems
The following table describes the most common problems related to ride comfort and proposes countermeasures to those
problems. Before taking any action, make sure the startup procedures have been performed as previously described.
Problem Control Mode and Possible Cause Corrective Action
Rollback at start
All
Insufficient torque when the brake is released.
• Increase the DC Injection Braking Current at Start using parameter S1-02.
• Increase the Minimum Output Frequency Voltage (E1-10) and Medium
Output Frequency Voltage (E1-08) V/f pattern voltages. Make sure, that the
starting and leveling current does not rise too high.
DC Injection and brake timing is not optimized.
Set the time for DC Injection Braking at Start (S1-04) as short as possible, and
make sure that brake releases completely before the motor starts to turn.
Motor torque is not fully established when the brake is
released. Lengthen the Brake Release Delay Time (S1-06) and the time for DC
Injection Braking / Position Lock at Start (S1-04).
Motor contactor closes too late.
Make sure that the contactors are closed before the Up/Down command is
issued.
OLV The slip or torque compensation function acts too slowly.
• Decrease the Torque Compensation Time (C4-02).
• Decrease the Slip Compensation Time (C3-02).
Shock at start All
Motor starts turning when the brake is not completely released
or runs against the brake.
Increase the DC Injection Braking Time at Start using parameter S1-04.
Acceleration rate is changing too quickly.
Decrease the Jerk at Start. Decrease C2-01 if set in m/s 2 , increase C2-01 if set
in s.
Rollback occurs during brake release. Refer to “Rollback at start”.
Shock at stop All
Brake is applied too early, causing the motor to run against the
brake. Increase the Delay Time to Apply the Brake (S1-07). If necessary, also
increase the DC Injection Braking Time at Stop S1-05.
Motor contactor is released before the brake is fully applied. Check the motor contactor sequence.
Jerk occurs due to overshoot
when the motor reaches top
speed.
OLV Too fast torque or slip compensation.
• Increase the Torque Compensation Delay Time (C4-02).
• Increase the Slip Compensation Delay Time (C3-02).
All
The acceleration rate changes too quickly when reaching the
selected speed. Decrease the Jerk at the End of Acceleration. Decrease C2-02 if set in m/s 2 ,
increase C2-02 if set in s.
Motor stops shortly (under-
shoot) when the leveling
speed is reached.
All
Not enough torque at low speed.
Increase the Minimum and Middle Voltage Levels for the V/f pattern voltage
(E1-10 and E1-08 respectively). Make sure that the Starting and Leveling
Current does not rise too high.
The deceleration rate changes too quickly when reaching
leveling speed. Decrease the Jerk at the End of Deceleration. Decrease C2-04 if set in m/s
2
,
increase C2-04 if set in s.
OLV
Motor data incorrect.
Adjust the motor data (E2- ), especially the motor slip (E2-02) and no-
load current values (E2-03), or perform Auto-Tuning.
Too much slip compensation.
Motor or machine vibrates at
high speed or top speed
OLV Torque compensation responds too quickly. Increase the Torque Compensation Delay Time (C4-02).
Motor or machine 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 Delay Time (C4-02).
Output voltage is too high. Reduce the V/f Pattern settings (E1-08, E1-10).
The value for the motor slip is set incorrectly.
Check the Motor Slip value in parameter E2-02. Increase or decrease it in
steps of 0.2 Hz.
Vibrations with the fre-
quency equal to the motor
speed occur.
All
Mechanical problems. Check bearings and gearbox.
Rotational parts (motor armature, handwheel, brake disk/
drum) are not properly balanced.
Properly balance rotating parts.
Top speed is different in
motoring and regenerative
mode.
OLV
Slip Compensation during Regenerative operation is switched
off.
Make sure C3-04 is set properly and set parameter C3-05 to 0.
Acceleration is longer than
set to C1-
parameters.
All
The load is too high.
• Check if the acceleration rate set is not too high (acceleration time is too
short).
• Make sure the drive rated current is enough to fulfill the application
requirements.
• Make sure the load is not seized, car guide lubrication is ok, etc.
The load is too high and the current/torque exceeds the stall
prevention level. Check if the Stall Prevention Level at Acceleration in L3-03 is not set too
small.
OLV
The load is too high and the torque exceeds the drives torque
limits.
Check it the Torque Limit parameters L7- are not set too low.
Motor speed does not match
the speed reference at con-
stant speed.
All 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 Level During Run in L3-06 is not set too low.
OLV The load is too high and the torque exceeds the torque limits. Check it the Torque Limit parameters L7- are not set too low.
High frequency acoustic
noise from the motor.
All 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.