Adjustment Suggestions
4-17
Adjustment Suggestions
If hunting, vibration, or other problems originating in the control system occur during trial operation,
adjust the parameters listed in the following table according to the control method. This table lists only the
most commonly used user parameters.
Table 4.4 Adjusted User Parameters
Control
Method
Name
(Parameter Number)
Performance
Factory
Setting
Recommended
Setting
Adjustment Method
V/f control
(A1-02 = 0
or 1)
Hunting-prevention
gain (N1-02)
Controlling hunting
and vibration in
middle-range speeds
(10 to 40 Hz)
1.00 0.50 to 2.00
• Reduce the setting if
torque is insufficient for
heavy loads.
• Increase the setting if
hunting or vibration occurs
for light loads.
Carrier frequency
selection
(C6-02)
• Reducing motor
magnetic noise
• Controlling hunting
and vibration at low
speeds
Depends
on
capacity
0 to
default
• Increase the setting if
motor magnetic noise is
high.
• Reduce the setting if
hunting or vibration occurs
at low to middle-range
speeds.
Torque
compensation
primary delay time
constant (C4-02)
• Increasing torque
and speed response
• Controlling hunting
and vibration
Depends
on
capacity
200 to 1000ms
• Reduce the setting if
torque or speed response is
slow.
• Increase the setting if
hunting or vibration
occurs.
Torque
compensation gain
(C4-01)
• Improving torque at
low speeds (10 Hz
or lower)
• Controlling hunting
and vibration
1.00 0.50 to 1.50
• Increase the setting if
torque is insufficient at
low speeds.
• Reduce the setting if
hunting or vibration occurs
for light loads.
Middle output
frequency voltage
(E1-08)
Minimum output
frequency voltage
(E1-10)
• Improving torque at
low speeds
• Controlling shock at
startup
Depends
on
capacity
and
voltage
Default to
Default + 3 to
5 V
*
• Increase the setting if
torque is insufficient at
low speeds.
• Reduce the setting if shock
at startup is large.
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