YASKAWA L1000V CIMR-LC V Series, Quick Start Manual, Page: 37 / 54

6 Fine Adjustments
YASKAWA Europe TOEP C710606 50B - AC Drive L1000V - Quick Start Guide EN 37
6 Fine Adjustments
This section provides tips for improving ride quality after basic setup is completed and lists
solutions to potential problems.
 Potential Problems and Solutions
Problem Control Mode and Possible Cause Corrective Action
Rollback at start All
Not enough torque when the brake is
released
• Increase the DC Injection Braking current at
start using parameter S1-02.
• Set the time for DC Injection Braking at start
(S1-04) to as short a value as possible, but
make sure that brake releases completely
before the motor starts to turn.
• Increase the minimum (E1-10) and medium
(E1-08) V/f pattern voltages. Make sure, that
the starting and leveling current does not rise
too high.
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 contactors close too late
Make sure, that the contactors are closed before
the Up/Down command is set.
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
Smoothen the Jerk at start by increasing C2-01
Rollback occurs during brake opening. See above under “Rollback at start”.
Motor or
machine
vibrates in the
low or medium
speed range
OLV
Torque compensation is responding
too quickly Increase the torque compensation delay time
(C4-02).
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.
All Output voltage is too high Reduce the V/f pattern settings (E1-08, E1-10).
Motor or machine
vibrates at high
speed or top speed
OLV
Torque compensation is responding
too quickly Increase the torque compensation delay time
(C4-02).
Car jerks sud-
denly due to over-
shoot as the motor
reaches top speed
OLV
Torque compensation or slip compen-
sation reacts too fast
Increase the torque compensation delay time
(C4-02).
Increase the slip compensation delay time
(C3-02).
All
The acceleration rate changes too
quickly Smoothen the Jerk at the end of acceleration by
increasing C2-02