YASKAWA VS-616G5 Series, Programming Manual, Page: 29 / 162

VS-616G5 Programming Manual 29
V/f V/f w/PG Open Loop
Vector
Flux
Vector
B9 Zero Servo
The zero servo function is enabled when the multi-function contact input is set to zero servo command
(H1-__ = “72”). The motor position is then memorized when motor speed feedback is less than the
zero speed level (B2-01).
Setting Range: 0 to 100
Factory Default: 5
Sets the zero-servo position loop gain. When adjusting the gain, the higher the setting, the quicker the
response. However, if the gain is set too high, it can cause overshoot and a possible runaway condition.
Setting Range: 0 to 16383 pulses
Factory Default: 10 pulses
Sets zero servo bandwidth in units of one pulse. During zero servo control, the multi-function contact
output (H2-__ = “33”) is closed until the number of pulses (or bandwidth) is completed. Then the con-
tact output opens.
B9-01 Zero Servo Gain Zero Servo Gain
- - - A
B9-02 Zero Servo Bandwidth Zero Servo Count
- - - A
L2-04
Figure 10 Timing Diagram of Energy Saving Function
Fref
≥
B8-02
FWD
Energy
Saving
Command
(Multi-function input
setting = “63”)
Fout
Vout
V/f Pattern × Energy Saving Gain (B8-01)
Figure 11 Zero Servo Position Loop
0
(Position Ref.)
Kp
B9-01
Motor Speed Feedback
Speed Reference
+
-
∫
Motor
Position Deviation
Counter
Section B: Application Parameters
B9 Zero Servo