YASKAWA L1000A Quick Start Manual page 36

6 Fine Adjustments
Problem
Speed reference and
motor speed do not
match when using an All
analog reference
signal.
All
Acceleration is longer
than set to C1-
parameters.
V/f
OLV
OLV, CLV
CLV/PM
All
Motor speed does not
match the speed
V/f
reference at constant
speed.
OLV, CLV
CLV/PM
High frequency
acoustic noise from All
the motor

Speed Loop Adjustments (CLV and CLV/PM)
The speed control loop uses three different gain and integral time settings that can be adjusted using C5- parameters.
The settings are switched over when the motor speed reaches the level set in parameter C5-07.
• Proportional gain and integral time C5-03/C5-04 are used at start when the speed is lower than the setting of C5-07.
• Proportional gain and integral time C5-01/C5-02 are used at speeds above the setting of C5-07.
• Proportional gain and integral time C5-13/C5-14 are used at stop when the speed is lower than the setting of C5-07.
Increase the gain and shorten the integral time to increase speed control responsiveness in each of the sections. Reduce
the gain and increase the integral time if vibration or oscillation occurs.

Inertia Compensation (CLV and CLV/PM)
Inertia compensation can be used to eliminate motor speed overshoot at the acceleration end or undershoot at the end of
deceleration caused by the system inertia. Adjust the function following the steps below.
1.
Make sure the speed control loop parameters are adjusted properly (C5-).
2.
Set parameter n5-01 = 1 to enable inertia compensation.
3.
Calculate and set n5-02 and n5-03 as follows:
Motor Acceleration
n5-02 = J
Time n5-02
ΣJ = J
Inertia Compensation
Gain n5-03
n5-03 = ΣJ / J
<1> Insert 0 kg for the load to calculate the lowest setting, insert the elevator rated load to calculate the maximum setting for n5-03. Use the lower
setting for initial trials.
4.
Change the setting of n5-03 within the limits calculated in step 3 until the desired performance is achieved.
EN 36
Control Mode and Possible Cause
The drives analog input is not set according to
the signal level of the controller speed reference
output signal.
The load is too high.
The load is too high and the current/torque
exceeds the stall prevention level.
The load is too high and the torque exceeds the
drives torque limits.
The load is too high.
The load is too high and the current/torque
exceeds the stall prevention level.
The load is too high and the torque exceeds the
torque limits.
The carrier frequency is too low.
π
n
r_Mot
30 T
Mot
r_Mot
30 v
2
+ Σm
r_Elev
i 2
π n
TS
r_Mot
Mot
Check the gain and bias settings for the analog input that is
used to set the speed reference. Check parameters H3-03 and
H3-04 for input A1, check parameters H3-11 and H3-12 for
input A2.
• Check if the acceleration ramp 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 does not stuck, car guide lubrication is
ok, etc.
Check if the stall prevention level at acceleration in L3-03 is
not set too small.
Check it the torque limit parameters L7- are not set too
small.
Make sure the drive rated current is enough to fulfill the
application requirements.
Check if the stall prevention level during run in L3-06 is not
set too small.
Check it the torque limit parameters L7- are not set too
small.
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.
• J - Motor inertia in kgm 2
Mot
• n - Rated motor speed in min
r_Mot
• T - Rated motor torque in Nm
r_Mot
• J - Traction sheave inertia in kgm
TS
• i - Gear ratio (n /n )
Load Mot
• v - Rated elevator speed in m/s
r_Elev
• m - Mass of all moved parts (car, counterweight, ropes, load
YASKAWA ELECTRIC TOEP C710616 33G AC Drive L1000A - Quick Start Guide
Corrective Action
-1
2
<1>
) in kg