Adjustment Suggestions
4
-
11
Adjustment Suggestions
If hunting, vibration, or other problems originated by the control system occur during trial operation,
adjust the constants listed in the following table according to the control method. This table lists only the
most commonly used user constants only.
* The setting is given for 200 V Class Inverters. Double the voltage for 400 V Class Inverters.
The following user constants will also affect the control system indirectly.
* Will be available in future software versions. For details please contact your Yaskawa representative.
Table 4.3 Adjusted User Constants
Name (Constant
Number)
Performance
Factory Set-
ting
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 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 mid-
dle-range speeds.
Torque compensation
primary delay time
constant (C4-02)
• Increasing torque
and speed response
• Controlling hunting
and vibration
Depends on
capacity
200 to 1000
ms
• 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 fre-
quency voltage
(E1-08)
Minimum output fre-
quency voltage
(E1-10)
• Improving torque at
low speeds
• Controlling shock at
startup
Depends on
capacity 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 4.4 Constants Affecting Control and Applications Indirectly
Name (Constant 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.
Analog input filter time constant (H3-12)*
Used to prevent fluctuations in analog input signals caused by noise.
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 an
optional braking resistor unit and braking unit, however, disable stall pre-
vention during deceleration by setting L3-04 to 0.
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