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Improved Operating Efficiency
This section explains functions for improving motor operating efficiency.
Reducing Motor Speed Fluctuation (Slip Compensation Function)
When the load is large, the amount of motor slip also grows large and the motor speed decreases. The slip
compensation function controls the motor at a constant speed, regardless of changes in load. When the motor
is operating at the rated load, constant E2-02 (Motor Rated Slip) × the frequency in constant C3-01 is added to
the output frequency.
Related Constants
Name
Constant
Number
Display
Slip compensation
gain
C3-01
Slip Comp Gain
Slip compensation
primary delay time
C3-02
Slip Comp Time
Slip compensation
limit
C3-03
Slip Comp Limit
Slip compensation
selection during
C3-04
regeneration
Slip Comp Regen
Output voltage limit
operation selection
C3-05
Output V limit
* The factory setting will change when the control method is changed. The open-loop vector factory settings are given.
Setting
Description
Range
Improve speed accuracy when
operating with a load.
Usually setting is not necessary.
Adjust this constant in the fol-
lowing cases.
• When actual speed is low,
0.0 to
increase the set value.
• When actual speed is high,
decrease the set value.
Used as the applicable control
gain when using flux vector
control.
Sets the slip compensation pri-
mary delay time in ms units.
Usually setting is not necessary.
Adjust this constant in the fol-
lowing cases.
• Reduce the setting when slip
10000
compensation response is
slow.
• When speed is not stabilized,
increase the setting.
Sets the slip compensation limit
as a percentage of motor rated
slip.
0: Disabled during regenera-
tion
0 or 1
1: Enabled during regeneration
0: Disabled.
1: Enabled. (The motor flux
will be lowered automati-
0 or 1
cally when the output volt-
age become saturated.)
Improved Operating Efficiency
Change
Methods
Factory
during
Open-
Setting
Operation
loop
Vector
1.0
Yes
A
2.5
0 to
3000
No
A
ms
0 to
200%
No
A
250
0
No
A
1
No
A
Control
MEMOBUS
Register
Flux
Vector
A
260H
A
261H
No
262H
No
263H
A
264H
19
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Troubleshooting
