YASKAWA F7 Programming Manual page 193

Parameter Parameter Name
No. Digital Operator Display
OL2 Characteristic Selection
L8-15 at Low Speeds
OL2 Sel @ L-Spd
Soft CLA Selection
L8-18
Soft CLA Sel
Hunting Prevention Selection
n1-01
Hunt Prev Select
Hunting Prevention Gain
n1-02 Setting
Hunt Prev Gain
Speed Feedback Detection
n2-01 Control (AFR) Gain
AFR Gain
Speed Feedback Detection
Control (AFR) Time
n2-02
Constant
AFR Time
Speed Feedback Detection
Control (AFR) Time
n2-03
Constant 2
AFR Time 2
High Slip Braking
Deceleration Frequency
n3-01
Width
HSB Decel Width
High Slip Braking Current
n3-02 Limit
HSB Current Ref
High Slip Braking Dwell
n3-03 Time at Stop
HSB DwelTim@ Stp
High Slip Braking Overload
n3-04 Time
HSB OL Time
Denotes that parameter can be changed when the Drive is running.
Table A.1 F7 Parameter List (Continued)
Description
This parameter assists in protecting the output transistors from
overheating when output current is high and output frequency is
low (6Hz and less).
0: Disabled
1: Enabled (L8-18 is active)
Enables and disables the software current limit function. Consult
the factory before disabling.
0: Disabled
1: Enabled
Hunting Prevention
If the motor vibrates while lightly loaded, hunting
prevention may reduce the vibration.
0: Disabled
1: Enabled
Sets the gain for the Hunting Prevention Function.
If the motor vibrates while lightly loaded and n1-01=1, increase the
gain by 0.1 until vibration ceases.
If the motor stalls while n1-01=1, decrease the gain by 0.1 until the
stalling ceases.
AFR Tuning
Sets the internal speed feedback detection control gain in the
automatic frequency regulator (AFR).
Normally, there is no need to change this setting.
Adjust this parameter as follows:
• 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.
Sets the time constant to control the rate of change in the speed
feedback detection control.
Sets the time constant to control the amount of change in the speed
at low speed.
High Slip Braking
Sets how aggressively the Drive decreases the output frequency as
it stops the motor using high slip braking (HSB). If Overvoltage
(OV) faults occur during HSB, this parameter may need to be
increased.
Sets the maximum current to be drawn during an HSB stop. Higher
n3-02 settings will shorten motor stopping times but cause
increased motor current, and therefore increased motor heating.
Sets the amount of time the Drive will dwell at E1-09 (Minimum
Frequency) at the end of deceleration. If this time is set too low, the
machine inertia can cause the motor to rotate slightly after the HSB
stop is complete and the Drive output is shut off.
Sets the time required for an HSB overload fault (OL7) to occur
when the Drive output frequency does not change for some reason
during an HSB stop. Normally this does not need to be adjusted.
Programming 185
Control Method
Setting Factory
V/F
Range Setting
V/F w/
PG
0 to 1 0 A A
0 to 1 1 A A
0 to 1 1 A A
0.00 to
1.00 A A
2.50
0.00 to
1.00 - -
10.00
0 to
50ms - -
2000
0 to
750ms - -
2000
1 to 20 5% A A
100 to
150% A A
200
0.0 to
1.0sec A A
10.0
30 to
40sec A A
1200
Open
Flux
Loop
Vector
Vector
A A
A A
- -
- -
A -
A -
A -
- -
- -
- -
- -