Parameter Details
12
12.4 C: Tuning
YASKAWA SIEPC71061737D GA800 Drive Technical Reference 785
Table 12.32 Example Settings of MFAO Terminals to Monitor Speed Waveforms
No. Name Setting Value Description
H4-01 Terminal FM Analog Output Select 116 Lets you use terminal FM to monitor U1-16
[SFS Output Frequency].
H4-02 Terminal FM Analog Output Gain 100.0%
H4-03 Terminal FM Analog Output Bias 0.0%
H4-04 Terminal AM Analog Output Select 105 Lets you use terminal AM to monitor U1-05
[Motor Speed].
H4-05 Terminal AM Analog Output Gain 50.0%
H4-06 Terminal AM Analog Output Bias 0.0%
H4-07 Terminal FM Signal Level Select 1 Lets you monitor in a -10 V to +10 V range.
H4-08 Terminal AM Signal Level Select 1
These settings cause this MFAO configuration. The MFAO common is terminal AC:
• Terminal FM: Outputs the output frequency after SFS in a -10 V to +10 V (-100% to +100%) range.
• Terminal AM: Outputs the motor speed in a -10 V to +10 V (-200% to +200%) range.
Yaskawa recommends that you monitor the output frequency after SFS and the motor speed for delays in response
and differences in reference values.
■ Adjust ASR Parameters
Use Table 12.33 to adjust ASR. The table lists parameters for motor 1. You can make the same changes to motor 2
parameters when you run a second motor.
Note:
When adjusting the proportional gain and integral time, adjust the proportional gain first.
Table 12.33 ASR Response and Possible Solutions
Problem Possible Solutions
Speed response is slow.
• Increase C5-01/C5-03 [ASR Proportional Gain].
• Decrease C5-02/C5-04 [ASR Integral Time].
Overshoot or undershoot occurs at the end of acceleration
or deceleration.
• Decrease C5-01/C5-03.
• Increase C5-02/C5-04.
Vibration and oscillation occur at constant speed.
• Decrease C5-01/C5-03.
• Increase C5-02/C5-04.
• Increase C5-06 [ASR Delay Time].
Speed accuracy is unsatisfactory when you operate a motor
that has a large quantity of rated slip in Closed Loop V/f
Control.
• Examine the pulse number set to F1-01 [Encoder 1
Pulse Count (PPR)] and the gear ratio to F1-12
[Encoder 1 Gear Teeth 1] and F1-13 [Encoder 1 Gear
Teeth 2].
• Make sure that you correctly set the pulse signal from
the encoder.
• Examine U6-04 [ASR Output] to make sure that the
ASR operates at its output limit set to C5-05 [ASR
Limit]. If the ASR is at the output limit, increase C5-05.
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