Decreasing Motor Speed Fluctuation; Slip Compensation - YASKAWA VS mini C Series Instruction Manual

• Decreasing Motor Speed Fluctuation
Slip compensation I
As the load becomes larger, the motor speed is reduced and motor slip value
is increased, The slip compensating function controls the motor speed at a
constant value even if the load varies.
When inverter output current is equal to the electronic thermal reference
current (motor rated current), the compensation frequency is added to the
output frequency.
Compensation frequency = Motor rated slip value
Output current - Motor no-load current (n55)
X Electronic thermal
- Motor no-load current (n55)
reference current (n31 )
Motor rated slip value = Max. voltage output frequency (n26)
× Slip compensation gain (n54)
Constants
3onslants Initial
No. Name Unit Setting range Settin_
n24 Max. output frequency 0.1Hz 50.0 to 400Hz 60.OHz
Max. voltage output
n26 frequency 0.1Hz 0.6 to 400Hz 6O.0Hz
n31 referenceElectr°ric thermalcurrent O.1A 0 to 120% of inverter rated current *
0.0 to 9.9% (100%=max. voltage
Slip compensation 0.1% output frequency n26) 0.0%
n54 gain
Setting 0.0% invalidated slip compensation
Motor no-load 0 to 99% (100%=Electronic thermal
n55 current 1% reference current n31) 40%
n62 t Slip compensation 0.1s O.0to25.5s
primary delay time When 0.0s is set delay 'dme becomes 2.0s 2.0s
• Differsdependingon invertercapacity. |
Not provided for software version No. NSP 600101 or before.
Notes : I. Slip compensation is not performed in the following conditions:
• Output frequency < minimum oulpul frequency (n29)
• During regeneration.
• Setting to electronic thermal reference current (n31) to O,OA.
2. In the constant output area [output frequency > max. voltage output frequency (n26)],
compensation frequency is increased automatically as described on the following
page,
56