YASKAWA Varispeed V7 Instruction Manual page 134

• If the speed is more than the target value, reduce the slip compensa-
tion gain.
Adjustment of the Slip Compensation Time Constant (n112) is normally
not required. Adjust it under the following conditions:
• Reduce the setting if response is slow.
• Increase the setting if speed is unstable.
Select slip compensation status during regeneration as follows:
n113 Setting
0
1
Motor Constant Calculation
An example of motor constant calculation is shown below.
1. Motor Rated Slip (n106)
120 × motor rated frequency (Hz)*
Number of motor poles
2. Line to Neutral (per Phase) (n107)
Calculations are based on the line-to-line resistance and insulation
grade of the motor test report.
E type insulation: Test report of line-to-line resistance at 75°C (Ω) × 0.92 ×
B type insulation: Test report of line-to-line resistance at 75°C (Ω) × 0.92 ×
F type insulation: Test report of line-to-line resistance at 115°C (Ω) × 0.92 ×
3. Motor Rated Current (n036)
= Rated current at motor rated frequency (Hz)
4. Motor No-load Current (n110)
No-load current (A) at motor rated frequency (Hz)*
Rated current (A) at motor rated frequency (Hz)*
* 1. Base frequency (Hz) during constant output control
* 2. Rated speed (r/min) at base frequency during constant output control
Set n106 (Motor Rated Slip), n036 (Motor Rated Current), n107 (Line
to Neutral (per Phase)), and n110 (Motor No-load Current) according to
Slip Correction during Regenerative Operation
120/Number of motor poles
7. Programming Features
Disabled
Enabled
1
Motor rated speed (r/min)*
*1
(A)
1
100 (%)
1
2
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