YASKAWA V1000 Series Installation & Start-Up Manual page 179

Problem
• Overvoltage trips when
accelerating, decelerating, or
during sudden speed or load
changes
• Poor speed response and
stability
• Poor speed precision
• Motor noise
• Control motor hunting and
oscillation occur at speeds
below 10 Hz.
• Poor motor torque at low
speeds
• Poor speed response
• Motor instability at motor
start.
<1> Default settings change when the Control Method is changed (A1-02) or a different V/f pattern is selected using
parmaeter E1-03. The default setting shown is for V/f Control.
When using OLV Motor Control, leave the torque compensation gain (C4-01) at its default
setting of 1.00. To increase speed precision during regeneration in OLV Motor Control,
enable slip compensation during regeneration (C3-04 = "1").
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual
5.2 Motor Performance Fine Tuning
Parameter No.
• If overvoltage trips occur, gradually
increase this setting by 10 ms and check
the performance.
Torque
• If response is slow, gradually reduce this
Compensation
setting by 2 ms and check the
Primary Delay
performance. Note: Ensure that C4-02 ≤
Time Constant 2
C4-06. When changing C4-06 (Torque
(C4-06)
Compensation Primary Delay Time
Constant 2), increase the value of n2-03
proportionally.
Slip
• If response is slow, gradually decrease the
Compensation
setting by 10 ms.
Primary Delay
• If speed is unstable, gradually increase the
Time Constant
setting by 10 ms.
(C3-02)
• If speed is too slow, gradually increase the
Slip
setting by 0.1 ms.
Compensation
• If speed is too fast, gradually decrease the
Gain (C3-01)
setting by 0.1 ms.
• If there is too much motor noise, the
carrier frequency is too high.
Carrier
• If motor hunting and oscillation occur at
Frequency
low speeds, reduce the carrier frequency.
Selection
• The default setting for the carrier
(C6-02)
frequency depends on the drive capacity
(o2-04) and Drive Duty Selection (C6-01).
• If motor torque and speed response are too
slow, increase the setting.
Mid Output • If the motor exhibits excessive instability
Voltage A at start-up, reduce the setting. Note: The
(E1-08) default value is for 200 V class units.
Minimum Double this value when using a 400 V
Output Voltage class drive. When working with a
(E1-10) relatively light load, increasing this value
too much can create an excessively high of
a torque reference.
Countermeasure
Default Suggeste
Value d Setting
150 to 750
150 ms
ms
200 ms 100 to 500
ms
<1>
1.0
0.5 to 1.5
<1>
5
7
0 to the
(Swing
default
PWM
setting
1)
E1-08:
12.0 V
<1>
Initial ±2 V
E1-10:
2.5 V
<1>
179