Closed Loop Vector Control Method - YASKAWA GA800 Technical Reference

Issue
Speed precision is unsatisfactory. C3-01 [Slip Compensation Gain]
• The volume of the motor
excitation sound is too high.
C6-02 [Carrier Frequency
Selection]
• Hunting or oscillation at low
speeds (10 Hz or lower)
• Torque at low speeds (10 Hz or
lower) is not sufficient. speed
• E1-08 [Mid Point A Voltage]
response is slow.
• E1-10 [Minimum Output
• Speed response is slow.
• Large initial vibration at start
up.
*1 The default setting changes when the settings forA1-02 [Control Method Selection] and o2-04 [Drive Model (KVA) Selection] change.
*2 The default setting changes when the settings for A1-02 [Control Method Selection] and E1-03 [V/f Pattern Selection] change.
*3 The default setting changes when the settings for C6-01 [Normal / Heavy Duty Selection] and o2-04 change.
*4 Recommended settings are for 200 V class drives. Multiply the voltage by 2 for 400 V class drives.
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Precaution When You Use IE3 Premium Efficiency Motors
IE3 motors have different motor characteristics from IE1 and other motors. Set the parameters as specified by the
motor characteristics. If the drive detects oC [Overcurrent] or ov [Overvoltage] during speed search after the drive
restores power after a momentary power loss, set these parameters:
• b3-03 [Speed Search Deceleration Time] = default value × 2
• L2-03 [Minimum Baseblock Time] = default value × 2
• L2-04 [Powerloss V/f Recovery Ramp Time] = default value × 2
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Closed Loop Vector Control Method

Issue
• High speed
• Low speed
• Unsatisfactory motor torque
and speed response
• Hunting or oscillation
• High speed
• Low speed
The drive cannot find ASR
C5-07 [ASR Gain Switchover
proportional gain or integral time
Frequency]
for low speed or high speed.
Hunting or oscillation C5-06 [ASR Delay Time]
• The volume of the motor
excitation sound is too high.
C6-02 [Carrier Frequency
Selection]
• Hunting or oscillation at low
speeds (3 Hz or lower)
*1 Refer to the section on C5-xx parameters for more information about speed control (ASR).
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
4.10 Fine Tuning during Test Runs (Adjust the Control Function)
Parameter Number Possible Solutions
• If speed is too slow, increase the
setting value in increments of
0.1.
• If speed is too fast, decrease the
setting value in increments of
0.1.
• If the volume of the motor
excitation sound is too high,
increase the carrier frequency.
• If hunting or oscillation occur at
low speeds, decrease the carrier
frequency.
• If torque or speed response are
slow, increase the setting value.
• If there is large initial vibration
at start up, decrease the setting
value
Note:
Voltage]
If the setting value is set too
high, a large torque reference
may be output even with light
loads.
Table 4.19 Parameters for Fine Tuning the Drive (CLV)
Parameter Number Possible Solutions
• If torque or speed response are
C5-01 [ASR Proportional Gain
slow, increase the setting value
1]
in increments of 5.00.
• If hunting or oscillation occur,
C5-03 [ASR Proportional Gain
decrease the setting value.
*1
2 (P)]
• If torque or speed response are
C5-02 [ASR Integral Time 1]
slow, decrease the setting value.
• If hunting or oscillation occur,
C5-04 [ASR Integral Time 2
increase the setting value.
*1
(I)]
Change the ASR proportional gain
and ASR integral time to conform
*1
to the output frequency.
• If torque or speed response are
slow, decrease the setting value
in increments of 0.010.
*1
• If the rigidity of the machine is
unsatisfactory and vibration is
possible, increase the setting
value.
• If the volume of the motor
excitation sound is too high,
increase the carrier frequency.
• If hunting or oscillation occur at
low speeds, decrease the carrier
frequency.
Default
*2
1.0 0.5 - 1.5
*3
1 (2 kHz) 0 to upper limit value
• E1-08: 11.0 V *2
Default setting +/- 2 V
*2
• E1-10: 2.0 V
Default
20.00 10.00 - 50.00
0.500 s 0.300 s to 1.000 s
0.0 Hz to maximum output
0.0 Hz
frequency
0.004 s 0.004 s to 0.020 s
*2
1 (2.0 kHz) 2.0 kHz to upper limit value
Recommended Setting
*4
Recommended Setting
4
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