Riding Comfort Related Problems - YASKAWA L1000A Technical Manual

◆ 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
V/f and OLV
OLV
Rollback at start
CLV
CLV/PM
All
Shock at start All
All
Shock at stop
CLV
CLV/PM
OLV
Jerk occurs due to overshoot
CLV
when the motor reaches top
CLV/PM
speed.
All
V/f and OLV Not enough torque at low speed.
OLV and
CLV
Motor stops shortly (under-
shoot) when the leveling
speed is reached.
CLV
CLV/PM
All
Motor speed overshoot at
acceleration end and under-
shoot when reaching leveling CLV
speed occurs. Problem can CLV/PM
not be resolved by adjusting
the speed loop.
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual
Control Mode and Possible Cause
Insufficient torque when the brake is released.
DC Injection and brake timing is not optimized.
The slip or torque compensation function acts too slowly.
The speed control is not responding fast enough when the
brake is released.
The Position Lock control loop does not respond fast enough.
Motor torque is not fully established when the brake is
released.
Motor contactor closes too late.
Motor starts turning when the brake is not completely released
or runs against the brake.
Acceleration rate is changing too quickly.
Rollback occurs during brake release.
Brake is applied too early, causing the motor to run against the
brake.
Motor contactor is released before the brake is fully applied.
Rollback occurs before the brake applies at stop.
Too fast torque or slip compensation.
Speed control loop setting is too soft or too hard.
Incorrect motor data.
Inertia compensation function is not set up correctly.
The acceleration rate changes too quickly when reaching the
selected speed.
Motor data incorrect.
Too much slip compensation.
Speed control loop responds too slow.
The inertia compensation function is not set up correctly.
The deceleration rate changes too quickly when reaching
leveling speed.
Inertia is high.
4.7 Setup Troubleshooting and Possible Solutions
• 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.
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.
• Decrease the Torque Compensation Time (C4-02).
• Decrease the Slip Compensation Time (C3-02).
Adjust the speed control loop parameters used During Position Lock. Increase
C5-19 and reduce C5-20.
• Adjust the speed control loop parameters used During Position Lock.
Increase C5-19 and reduce C5-20.
• Increase the Position Lock Gain at Start 1 in S3-01 gradually. If vibration
occurs reduce it.
• Increase the Position Lock Gain at Start 2 in S3-02 gradually until rollback
disappears.
Lengthen the Brake Release Delay Time (S1-06) and the time for DC
Injection Braking / Position Lock at Start (S1-04).
Make sure that the contactors are closed before the Up/Down command is
issued.
Increase the DC Injection Braking Time at Start using parameter S1-04.
Decrease the Jerk at Start. Decrease C2-01 if set in m/s
in s.
Refer to "Rollback at start".
Increase the Delay Time to Apply the Brake (S1-07). If necessary, also
increase the DC Injection Braking Time at Stop S1-05.
Check the motor contactor sequence.
• Make sure the speed control loop parameters for position lock are adjusted
properly (C5-13 and C5-14).
• Increase the Position Lock Gain at Stop S3-03 gradually until no rollback
occurs. If vibration occurs reduce the gain S3-03.
• Increase the Torque Compensation Delay Time (C4-02).
• Increase the Slip Compensation Delay Time (C3-02).
• Adjust the Speed Control Loop Gain C5-01 and Integral Time C5-02.
• Adjust Inertia Compensation parameters (n5-
settings can not solve the problem
• For induction motors readjust the motor data (E2-
(E2-02) and no-load current values (E2-03), or perform Auto-Tuning again.
• For PM motors readjust the motor data in E5-
If the Inertia Compensation Function is used (n5-01=1) make sure the values
in n5-02 and n5-03 are correct.
Decrease the Jerk at the End of Acceleration. Decrease C2-02 if set in m/s
increase C2-02 if set in s.
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.
Adjust the motor data (E2-
load current values (E2-03), or perform Auto-Tuning.
Increase the Speed Control Gain and reduce the Speed Control Integral Time
used for Low Speed at Stop. The parameters to be changed depend on the set-
ting of C5-05 and whether a third set of speed loop settings is used. Refer to
Speed Loop Adjustments (CLV and CLV/PM) on page
If the Inertia Compensation Function is used (n5-01 = 1) make sure the values
in n5-02 and n5-03 are correct.
Decrease the Jerk at the End of Deceleration. Decrease C2-04 if set in m/s
increase C2-04 if set in s.
Use the Inertia Compensation Function. Set n5-01 to 1 and then adjust param-
eters n5-02 and n5-03 as described in
PM) on page 122.
Corrective Action
2 , increase C2-01 if set
) if speed control loop
), especially the slip
or perform Auto-Tuning.
), especially the motor slip (E2-02) and no-
122.
Inertia Compensation (CLV and CLV/
4
2 ,
2 ,
137