6
-34
Improved
Operating
Efficiency
This
section explains functions for improving motor operating efficiency.
K
K
K
K
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, parameter E2-02 (Motor Rated Slip)
×
the frequency in parameter C3-01 is
added
to the output frequency.
n
Related
Parameters
* The
factory setting will change when the control method is changed. (V/f control factory settings are given.)
Param-
eter
Num-
ber
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control
Methods
V/f
V/f
with
PG
Open
Loop
Vec-
tor
LCD
Display
C3-01
Slip
compensation gain
Use
this parameter to improve speed accuracy
when
operating under a load. Normally, there is no
need
to make this setting.
Adjust
parameter C3-01 under the following con-
ditions:
• Increase
the set value when the speed falls to
below
the target value.
• Decrease
the set value when the speed rises to
above
the target value.
0.0
to 2.5
0.0*
Yes
A
No
A
Slip
Comp Gain
C3-02
Slip
compensation pri-
mary
delay time
Set
the primary delay time constant for the slip
compensation
function in seconds.
Normally,
there is no need to make this setting.
Adjust
parameter C3-02 under the following con-
ditions:
• When
the slip compensation response is low,
lower
the set value.
• When
the speed is unstable, increase the set
value.
0
to
10000
2000
ms
*
No
A
No
A
Slip
Comp Time
C3-03
Slip
compensation limit
Set
the upper limit of the compensation amount
for
the slip compensation function as a percent,
taking
the motor rated slip amount to be 100%.
0
to
250
200%
No
A
No
A
Slip
Comp Limit
C3-04
Slip
compensation during
regeneration
0:
Slip compensation is disabled during
regeneration.
1:
Slip compensation is enabled during
regeneration.
If
the slip compensation function operates during
regeneration,
you might have to use the braking
option
(braking resistor, Braking Resistor Unit, or
Braking
Unit) to momentarily increase the regen-
erative
amount.
0
or 1
0
No
A
No
A
Slip
Comp Regan
C3-05
Output
voltage limit opera-
tion
selection
0:
Disabled.
1:
Enabled. (The motor flux will be lowered auto-
matically
when the output voltage become sat-
urated.)
0
or 1
0
No
No
No
A
V/F
Slip Cmp Sel
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