Parameter Details
12
12.4 C: Tuning
YASKAWA SIEPC71061753C GA500 Technical Manual 553
■ C3-03: Slip Compensation Limit
No.
(Hex.)
Name Description
Default
(Range)
C3-03
(0211)
Slip Compensation Limit
Sets the upper limit for the slip compensation function as a percentage of the motor rated slip.
200%
(0 - 250%)
If you increase the value of C3-01 [Slip Compensation Gain] and the motor speed is slow, use this parameter. The
drive uses this parameter when the slip is at the upper limit of slip compensation. Make sure that you measure the
motor speed when you increase this parameter value. Set this parameter to make the frequency reference and the
slip compensation limit less than the permitted range of the machine.
The slip compensation limit is constant in the constant torque range (frequency reference ≤ E1-06 [Base
Frequency]). In the constant output range where the frequency reference > E1-06, the slip compensation limit
increases with the C3-03 value and the output frequency as shown in Figure 12.42.
Figure 12.42 Slip Compensation Limit
■ C3-04: Slip Compensation at Regen
No.
(Hex.)
Name Description
Default
(Range)
C3-04
(0212)
Slip Compensation at
Regen
Sets the slip compensation function during regeneration.
0
(0 - 2)
If you apply a regenerative load when the slip compensation function during regeneration is active, the quantity of
regeneration can increase immediately. In this condition, it is necessary to use a dynamic braking option (braking
resistor or braking resistor unit).
0 : Disabled
The drive will not do Slip compensation during regeneration.
The load and operation status (regenerative operation) can cause the motor speed to be higher or lower than the
frequency reference.
1 : Enabled Above 6Hz
Slip compensation function is enabled during regeneration. Slip compensation is disabled at output frequencies of
6 Hz or less.
2 : Enabled Above Defined Range
The drive uses E2-02 [Motor Rated Slip] to automatically calculate the frequency range where it will disable slip
compensation function during regenerative operation.
Slip compensation is enabled at frequencies as low as 2 Hz.
■ C3-05: Output Voltage Limit Selection
No.
(Hex.)
Name Description
Default
(Range)
C3-05
(0213)
Output Voltage Limit
Selection
Sets the automatic reduction of motor magnetic flux when the output voltage is saturated.
0
(0, 1)
The drive will decrease flux and increase current to compensate torque when voltage is saturated. Make sure that
the drive has sufficient output current capacity before you enable this parameter. When this parameter = 1
[Enabled], the output current will increase by 10% at a maximum (at rated load) before it is enabled.
Enable this parameter to increase speed precision when you move heavy loads at high speeds in these conditions:
• Power supply voltage is low
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