Adjustment Suggestions - YASKAWA Varispeed CIMR-G7A Instruction Manual

Adjustment Suggestions

If hunting, vibration, or other problems originating in 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.
Control Name (Constant
Method Number)
Hunting-prevention
gain (N1-02)
Carrier frequency
selection
(C6-02)
V/f control
Torque compensation
(A1-02 = 0
primary delay time
or 1)
constant (C4-02)
Torque compensation
gain (C4-01)
Middle output fre-
quency voltage
(E1-08)
Minimum output fre-
quency voltage
(E1-10)
Speed feedback detec-
tion control (AFR)
gain
(N2-01)
Torque compensation
Open-loop
primary delay time
vector 1
constant (C4-02)
control
(A1-02 = 2)
Slip compensation pri-
mary delay time (C3-
02)
Slip compensation
gain (C3-01)
Table 4.4 Adjusted User Constants
Factory
Performance
Setting
Controlling hunting
and vibration in mid-
1.00
dle-range speeds (10 to
40 Hz)
• Reducing motor
magnetic noise Depends
• Controlling hunting on capac-
and vibration at low ity
speeds
• Increasing torque
Depends
and speed response
on capac-
• Controlling hunting
ity
and vibration
• Improving torque at
low speeds (10 Hz
or lower) 1.00
• Controlling hunting
and vibration
• Improving torque at Depends
low speeds on capac-
• Controlling shock at ity and
startup voltage
• Increasing torque
and speed response
• Controlling hunting
1.00
and vibration in mid-
dle-range speeds (10
to 40 Hz)
• Increasing torque
and speed response
20 ms
• Controlling hunting
and vibration
• Increasing speed
response
200 ms
• Improving speed sta-
bility
• Improving speed
1.0
accuracy
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 hunt-
ing or vibration occurs for
light loads.
• Increase the setting if
motor magnetic noise is
high.
0 to
• Reduce the setting if hunt-
default
ing or vibration occurs at
low to middle-range
speeds.
• Reduce the setting if
torque or speed response is
200 to 1000
slow.
ms
• Increase the setting if hunt-
ing or vibration occurs.
• Increase the setting if
torque is insufficient at
low speeds.
0.50 to 1.50
• Reduce the setting if hunt-
ing or vibration occurs for
light loads.
• Increase the setting if
Default to
torque is insufficient at
Default + 3
low speeds.
*
• Reduce the setting if shock
to 5 V
at startup is large.
• Reduce the setting if
torque or speed response is
0.50 to 2.00 slow.
• Increase the setting if hunt-
ing or vibration occurs.
• Reduce the setting if
torque or speed response is
20 to
slow.
100 ms
• Increase the setting if hunt-
ing or vibration occurs.
• Reduce the setting if speed
100 to response is slow.
500 ms • Increase the setting if the
speed is not stable.
• Increase the setting if
speed response is slow.
0.5 to 1.5
• Reduce the setting if the
speed is too fast.
17
4-