Yaskawa L1000E AC Drive CIMR-LE†A - Manual (Page 126)

4 Start-Up Programming
126 YASKAWA TOEPYAIL1E01A YASKAWA AC Drive L1000E Quick Start Guide
■ 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
V/f and
OLV
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.
OLV
The slip or torque compensation function acts
too slowly. • Decrease the Torque Compensation Time (C4-02).
• Decrease the Slip Compensation Time (C3-02).
CLV
CLV/PM
The speed control is not responding fast enough
when the brake is released. Adjust the speed control loop parameters used During
Position Lock. Increase C5-19 and reduce C5-20.
The Position Lock control loop does not
respond fast enough.
• 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.
All
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.
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 Close 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.
CLV
CLV/PM
Rollback occurs before the brake applies at stop.
• 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.