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Problem
Parameter No.
Corrective Action
Default
Suggested
Setting
Overvoltage trips when
accelerating,
decelerating, or during
sudden speed or load
changes
AFR Time Constant 2
(n2-03)
• Gradually increase the setting in 50 ms increments if overvoltage
occurs.
• Gradually reduce the setting in 10 ms increments if response is
slow.
Note:
Ensure that n2-02
≤
n2-03. When making adjustments
to n2-03, increase the value of C4-06 (Torque
Compensation Primary Delay Time 2)
proportionally.
750 ms
750 to 2000 ms
Torque Compensation
Primary Delay Time
Constant 2 (C4-06)
• Gradually increase the setting in 10 ms increments and check the
performance if overvoltage trips occur.
• Gradually reduce the setting in 2 ms increments and check the
performance if response is slow.
Note:
Ensure that C4-02
≤
C4-06. When changing C4-06
(Torque Compensation Primary Delay Time
Constant 2), increase the value of n2-03
proportionally.
150 ms
150 to 750 ms
• Poor motor torque
and speed response
• Motor hunting and
oscillation
Torque Compensation
Primary Delay Time
Constant 1 (C4-02)
• Gradually reduce the setting in 2 ms increments and check the
performance to improve motor torque speed response.
• Gradually increase the setting in 10 ms increments if motor
hunting and oscillation occur.
Note:
Ensure that C4-02
≤
C4-06. When making
adjustments to C4-02, increase the AFR time constant
(n2-02) proportionally.
20 ms
20 to 100 ms
Poor speed response
and stability
Slip Compensation
Primary Delay Time
Constant (C3-02)
• Gradually reduce the setting in 10 ms increments if response is
slow.
• Gradually increase the setting in 10 ms increments if speed is
unstable.
200 ms
100 to 500 ms
Poor speed precision
Slip Compensation Gain
(C3-01)
• Gradually increase the setting in 0.1 ms increments if speed is too
slow.
• Gradually reduce the setting in 0.1 ms increments if speed is too
fast.
1.0
0.5 to 1.5
Poor speed precision
during regenerative
operation
Slip Compensation
Selection During
Regeneration (C3-04)
Enable slip compensation during regeneration by setting parameter
C3-04 = 1.
0
1
• Poor motor torque at
low speeds
• Poor speed response
• Motor instability at
start
Mid Output Voltage A
(E1-08)
Minimum Output
Voltage (E1-10)
• Increase the setting if motor torque and speed response are too
slow.
• Reduce the setting if the motor exhibits excessive instability at
start-up.
Note:
When working with a relatively light load, increasing
this value too much can cause overtorque.
Depends on
o2-04,
Drive
Model
Selection
Default setting
±2 V
When using OLV, leave the torque compensation gain (C4-01) at its default setting of 1.00.
u
Parameters to Minimize Motor Hunting and Oscillation
Parameters in
indirectly affect motor hunting and oscillation.
Table 2.3 Parameters that Affect Control Performance in Applications
Name
(Parameter No.)
Application
Dwell Function
(b6-01 through b6-04)
Prevents motor speed loss by maintaining the output frequency when working with heavy loads or when there
is powerful backlash on the machine side.
Accel/Decel Time
(C1-01 through C1-11)
Adjusting accel and decel times will affect the torque presented to the motor during acceleration or
deceleration.
S-Curve Characteristics
(C2-01 through C2-04)
Prevents shock at the beginning and end of acceleration and deceleration.
Jump Frequency
(d3-01 through d3-04)
Skips over the resonant frequencies of connected machinery.
Analog Filter Time Constant
(H3-13)
Prevents fluctuation in the analog input signal due to noise.
2.2 Motor Performance Fine-Tuning
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
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Troubleshooting