6 Fine Adjustments
EN 38
YASKAWA Europe
TOEP C710606 50B - AC Drive L1000V - Quick Start Guide
Motor stops
short
(undershoot)
when the
leveling speed
is reached
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
All
Not enough torque at low speed
Increase the minimum and mid voltage levels for
the V/f pattern (E1-10 and E1-08 respectively).
Make sure that the current at start and during
leveling does not rise too high.
Deceleration rate changes too quickly.
Smoothen the Jerk at the end of deceleration by
increasing C2-04.
Shock at stop
All
Brake is applied too early, causing the
motor to run against the brake
Increase the Brake Close Delay Time (S1-07). If
necessary, also increase the DC Injection Brak-
ing time at stop (S1-05).
Motor contactor is released though the
brake has not yet fully closed
Check the motor contactor sequence.
High frequency
motor noise
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 (8kHz), current derating must
be considered for the drive.
Vibrations which
increase with the
speed
All
Mechanical problems
Check bearings and gearbox.
Rotational parts (motor armature,
handwheel, brake disk/drum) are not
properly balanced
Balance the rotating parts.
Problem
Control Mode and Possible Cause
Corrective Action
