Yaskawa F7 Drive Programming Manual - Manual (Page 143)

Programming 135
n2 AFR Tuning
n2-01 Speed Feedback Detection Control (AFR) Gain
Setting Range: 0.00 to 2.50
Factory Default: 1.00
Sets the internal speed feedback detection control gain in the AFR. Normally there is no need to adjust n2-01 from the factory
default setting. Make adjustments in the following cases:
• If hunting occurs, increase the set value.
• If response is low, decrease the set value.
Adjust the setting by 0.05 units at a time while checking the response.
n2-02 Speed Feedback Detection Control (AFR) Time Constant
Setting Range: 0.00 to 2.50
Factory Default: 1.00
Sets the time constant to control the rate of change in the speed feedback detection control.
n2-03 Speed Feedback Detection Control (AFR) Time Constant 2
Setting Range: 0.00 to 2.50
Factory Default: 1.00
Sets the time constant to control the amount of change in the speed at low speed.
n3 High Slip Braking
High slip braking (HSB) is a method of decreasing the stopping time of a load without using dynamic braking. The regenerated
energy of the decelerating load is dissipated in the motor windings through increased motor slipping. Because of the increased
temperature of the motor windings, there is a limitation on the occurrence of HSB usage (~5% duty cycle). The stopping time
using HSB is approximately 50% of what can be done with the standard braking methods. HSB can be activated by closing a
digital input configured as a High Slip Braking input (H1-0x=68). The HSB digital input has priority over an active Run input and
will be implemented immediately. HSB is only applied to stopping the motor and load and cannot be used for changing speeds.
HSB can only be activated when the output frequency is greater than 6 Hz. When a HSB command is given it is not possible to
restart the Drive until the motor is stopped and the Run command is cycled.
n3-01 High-Slip Braking Deceleration Frequency Width
Setting Range: 1 to 20% of maximum frequency
Factory Default: 5% of maximum frequency
IMPORTANT
It is very important that Auto-tuning is performed before High Slip Braking is attempted. The Drive should be
Auto-tuned again if the motor or cable length is changed since the last Auto-tuning.