Adjustment Suggestions - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

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.
Name (Constant
Number)
Hunting-prevention
gain (N1-02)
Carrier frequency
selection
(C6-02)
Torque compensation
primary delay time
constant (C4-02)
Torque compensation
gain (C4-01)
Middle output fre-
quency voltage
(E1-08)
Minimum output fre-
quency voltage
(E1-10)
* 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.
Name (Constant Number)
Acceleration/deceleration times
(C1-01 to C1-11)
S-curve characteristics (C2-01 and C2-02)
Jump frequencies (d3-01 to d3-04)
Analog input filter time constant (H3-12)*
Stall prevention (L3-01 to L3-06)
* Will be available in future software versions. For details please contact your Yaskawa representative.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Table 4.3 Adjusted User Constants
Factory Set-
Performance
ting
Controlling hunting
and vibration in mid-
1.00
dle-range speeds (10 to
40 Hz)
• Reducing motor
magnetic noise
Depends on
• Controlling hunting
capacity
and vibration at low
speeds
• Increasing torque
and speed response Depends on
• Controlling hunting capacity
and vibration
• Improving torque at
low speeds (10 Hz
or lower) 1.00
• Controlling hunting
and vibration
• Improving torque at
Depends on
low speeds
capacity and
• Controlling shock at
voltage
startup
Table 4.4 Constants Affecting Control and Applications Indirectly
Adjust torque during acceleration and deceleration.
Used to prevent shock when completing acceleration.
Used to avoid resonance points during acceleration or deceleration.
Used to prevent fluctuations in analog input signals caused by noise.
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.
Adjustment Suggestions
Recom-
mended Adjustment Method
Setting
• Reduce the setting if torque is
insufficient for heavy loads.
0.50 to 2.00 • Increase the setting if hunting
or vibration occurs for light
loads.
• Increase the setting if motor
magnetic noise is high.
0 to
• Reduce the setting if hunting or
default
vibration occurs at low to mid-
dle-range speeds.
• Reduce the setting if torque or
200 to 1000 speed response is slow.
ms • Increase the setting if hunting
or vibration occurs.
• Increase the setting if torque is
insufficient at low speeds.
0.50 to 1.50
• Reduce the setting if hunting or
vibration occurs for light loads.
• Increase the setting if torque is
Default to
insufficient at low speeds.
Default + 3
• Reduce the setting if shock at
*
to 5 V
startup is large.
Application
11
4-