YASKAWA VARISPEED-616G5, Instruction Manual

Page: 154 / 355

Basic Operation
6.5.5 Adjusting Speed Control (ASR) Gain
6 - 46
The multi-function analog outputs have the following functions with these constant settings.
•
Multi-function analog output 1 (terminal 21): Outputs Inverter’s output frequency(0 to
±
10 V).
•
Multi-function analog output 2 (terminal 23): Outputs the actual motor speed (0 to
±
10 V).
Terminal 22 is the multi-function analog output common.
We recommend monitoring both the output frequency and the motor speed to monitor the response
delay or deviations from the reference value, as shown in the following diagram.
Motor speed
Output frequency
Time
Motor speed (response)
Fig
6.23
Example Monitor Waveforms
3. Give acceleration/deceleration commands and adjust the gain while observing the waveform.
Motor speed
Time
If overshooting occurs:
Decrease C5-01 and increase C5-02.
If undershooting occurs:
Decrease C5-03 and increase C5-04.
Fig 6.24 Gain Adjustments
4. If the overshooting or undershooting can’t be eliminated by adjusting the gain, decrease the ASR limit
(C5-05) to lower the frequency reference compensation limit.
User
Change
during Setting Factory
Valid Access Levels
User
Constant
Number
Name
g
during
Opera-
tion
Setting
Range
Unit Factory
Setting
V/f
Control
V/f with
PG
Open
Loop
Vector
Flux
Vector
C5-05 ASR limit
×
0.0 to 20.0 % 5.0
×
A
× ×
•
Since C5-05 can’t be changed during operation, stop the Inverter’s operation and then decrease
the ASR limit by 0.5 (%).
•
Perform step 3 again after the setting has been changed.
•
The ASR limit is the frequency limit for compensation by speed control. Set this frequency limit
as a percentage of the maximum output frequency.
•
If the frequency limit is lowered too much, the motor speed might not reach the target speed. Verify
that the target speed is reached during normal operation.
6