Adjustment Suggestions
4
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13
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 parameters.
* The setting is given for 200 V Class Inverters. Double the voltage for 400 V Class Inverters.
The following parameter will also affect the control system indirectly.
Table 4.4 Adjusted parameters
Name (Parameter
Number)
Performance
Factory
Setting
Recom-
mended
Setting
Adjustment Method
Hunting-prevention
gain (N1-02)
Controlling hunting
and vibration in mid-
dle-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 hunt-
ing or vibration occurs for
light loads.
Carrier frequency
selection
(C6-02)
• Reducing motor
magnetic noise
• Controlling hunting
and vibration at low
speeds
Depends
on capac-
ity
0 to
default
• Increase the setting if
motor magnetic noise is
high.
• Reduce the setting if hunt-
ing or vibration occurs at
low to middle-range
speeds.
Torque compensation
primary delay time
parameter (C4-02)
• Increasing torque
and speed response
• Controlling hunting
and vibration
Depends
on capac-
ity
200 to 1000
ms
• Reduce the setting if
torque or speed response is
slow.
• Increase the setting if hunt-
ing 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 hunt-
ing or vibration occurs for
light loads.
Middle output fre-
quency voltage
(E1-08)
Minimum output fre-
quency voltage
(E1-10)
• Improving torque at
low speeds
• Controlling shock at
startup
Depends
on capac-
ity and
voltage
Default to
D 3
to 5 V
*
• Increase the setting if
torque is insufficient at
low speeds.
• Reduce the setting if shock
at startup is large.
Table 4.5 Parameters Affecting Control and Applications Indirectly
Name (Parameter Number)
Application
Acceleration/deceleration times
(C1-01 to C1-11)
Adjust torque during acceleration and deceleration.
S-curve characteristics (C2-01 and C2-02)
Used to prevent shock when completing acceleration.
Jump frequencies (d3-01 to d3-04)
Used to avoid resonance points during acceleration or deceleration.
Stall prevention (L3-01 to L3-06)
Used to prevent OV (overvoltage errors) and motor stalling for heavy
loads or rapid acceleration/deceleration. Stall prevention is enabled by
default and the setting normally has not to be changed. When using a
braking resistor, however, disable stall prevention during deceleration by
setting L3-04 to 0.
