YASKAWA GA700 Series Technical Manual page 199

Issue
• Unsatisfactory motor torque
C4-02 [Torque Compensation
and speed response
Delay Time 1]
• Hunting or oscillation
• 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.
Voltage]
• 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.
■
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
YASKAWA SIEPC71061705H GA700 Series Technical Manual
4.10 Fine Tuning during Test Runs (Adjust the Control Function)
Parameter Number Possible Solutions
• If torque or speed response are
slow, decrease the setting
value in increments of 2 ms.
• If hunting or oscillation occur,
increase the setting value in
increments of 10 ms.
Note:
Make sure that this parameter
setting is: C4-02 ≤ C4-06
[Motor 2 Torque Comp Delay
Time].
When you adjust C4-02, you
must also increase the n2-02
[SpdFeedbackDetCtr (AFR)
TimeConst1] value by the
same ratio.
• 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
Note:
If the setting value is set too
high, a large torque reference
may be output even with light
loads.
Default Recommended Setting
*1
20 ms 20 ms to 100 ms
*1
200 ms 100 ms to 500 ms
*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
• E1-10: 2.0 V *2
*1
*4
4
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