Omron VARISPEED G7 -, Instruction Manual

Page: 227 / 417

6
-32
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
* The factory setting will change when the control method is changed. (Open-loop vector 1 factory settings are given.)
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
Display
V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vec-
tor
Open
Loop
Vector
2
C3-01
Slip compensa-
tion gain Used to improve speed accuracy
when operating with a load.
Usually setting is not necessary.
Adjust this constant at the follow-
ing times.
• When actual speed is low,
increase the set value.
• When actual speed is high,
decrease the set value.
0.0 to
2.5
1.0* Yes A No A A A
Slip Comp Gain
C3-02
Slip compensa-
tion primary
delay time Slip compensation primary delay
time is set in ms units.
Usually setting is not necessary.
Adjust this constant at the follow-
ing times.
• Reduce the setting when slip
compensation responsive is
slow.
• When speed is not stabilized,
increase the setting.
0 to
10000
200 ms
*
No A No A No No
Slip Comp
Time
C3-03
Slip compensa-
tion limit
Sets the slip compensation limit
as a percentage of motor rated
slip.
0 to
250
200% No A No A No No
Slip Comp
Limit
C3-04
Slip compensa-
tion selection
during regener-
ation 0: Disabled.
1: Enabled.
When the slip compensation dur-
ing regeneration function has
been activated, as regeneration
capacity increases momentarily, it
may be necessary to use a braking
option (braking resistor, Braking
Resistor Unit or Braking Unit.)
0 or 1 0 No A No A No No
Slip Comp
Regen
C3-05
Output voltage
limit operation
selection 0: Disabled.
1: Enabled. (The motor flux will
be lowered automatically
when the output voltage
become saturated.) 0 or 1 0 No No No A A A
Output V limit