Fine-Tuning Open Loop Vector Control For Pm Motors - YASKAWA CIPR-GA50C series Technical Manual

Issue
• Speed response is slow.
C3-02 [Slip Compensation Delay
Time]
• Speed is not stable.
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.
• E1-08 [Mid Point A Voltage]
speed 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 for A1-02 [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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Fine-Tuning Open Loop Vector Control for PM Motors

Table 4.19 Parameters for Fine Tuning the Drive (A1-02 = 5[OLV/PM])
Issue
Unsatisfactory motor E1-xx parameters, E5-xx
performance parameters
n8-55 [Motor to Load Inertia
Ratio]
n8-45 [Speed Feedback Detection
Gain]
Unsatisfactory motor torque and
speed response
C4-01 [Torque Compensation
Gain]
n8-51 [Pull-in Current @ Accel/
Decel]
• b2-02 [DC Injection Braking
• b2-03 [DC Inject Braking
• Oscillation when the motor
starts.
• Motor stalls.
n8-55 [Motor to Load Inertia
Ratio]
YASKAWA SIEPC71061753A GA500 Technical Manual
4.11 Fine Tuning during Test Runs (Adjust the Control Function)
Parameter Number Possible Solutions
• If speed response is slow,
decrease the setting value in
increments of 10 ms.
• If speed is not stable, increase
the value in increments of 10
ms.
• 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
Voltage] Note:
If you set the value too high,
the drive can output a large
torque reference although the
load is light.
Parameter Number Possible Solutions
• Check the settings for E1-06,
E1-04 [Base Frequency,
Maximum Output Frequency].
• Check the E5-xx and make
sure that all motor data has
been set correctly.
Note:
Do not set E5-05 [PM Motor
Resistance (ohms/phase)] to a
line-to-line resistance value.
• Do Auto-Tuning.
Adjust to match the load inertia
ratio of the motor and machine.
Decrease the setting value in
increments of 0.05.
Adjust the setting value.
Note:
Setting this value too high can
cause overcompensation and
motor oscillation.
Increase the setting value in
increments of 5%.
Use DC Injection Braking at start.
Note:
Current]
This can cause the motor to
rotate in reverse for
Time at Start]
approximately 1/8 of a turn at
start.
Increase the setting value.
Note:
When operating a single
motor or with a minimum
amount of inertia, setting this
value too high can cause
motor oscillation.
Default Recommended Setting
*1
200 ms 100 ms to 500 ms
*2
1.0 0.5 - 1.5
*3
7(Swing PWM1) 0 to upper limit value
*2
• E1-08: 12.0 V
Default setting +/- 2 V
*2
• E1-10: 2.5 V
Default Recommended Setting
-
0 Near the actual load inertia ratio.
0.80
0.00 1.00
50%
• b2-02: 50% • b2-02: Adjust as necessary.
• b2-03: 0.00 s • b2-03: 0.5 s
0 Near the actual load inertia ratio.
*4
-
-
4
-
145