YASKAWA F7 Programming Manual page 90

Function: PID SFS Cancel
Setting: 34
SFS means softstart, also referred to as accel/decel in this description.
By configuring a digital input as a PID SFS (softstart) Cancel input (H1-0x= 34), the operator will be able to use a contact closure to
remove the acceleration and deceleration times that are applied to changes in the PID setpoint by the b5-17 parameter. If the digital
input configured as PID SFS Cancel is closed, the PID setpoint Accel/Decel (Parameter b5-17) will be ignored. Immediate updating
of any change to the setpoint will apply.
Function: Input Level Selection
Setting: 35
When using the PID Function built into the Drive, the chosen set point is compared with the measured feedback. The difference is
called the Error. The proportional and integral function are applied to this error. For some applications it may be appropriate to invert
the input to the PID block. This can be accomplished by setting one of the digital inputs up as an Input Level Sel (H1-0x=35). When
an Input Level Sel digital input is closed the Error will be inverted before it is passed to the PID block.
Function: DC Injection Braking
Setting: 60
When a DC injection braking command is input while the Drive is stopped, DC injection braking operation is activated. When
a run command or a jog command is input, DC injection braking is released to start operation (jog operation has priority).
DC Injection Braking Command
Set
+
Point
-
Feed
back
Fig. 52 PID Error signal Inversion Block Diagram
OFF
Fwd Run Command OFF
DC Injection
Braking
Output Frequency
Fig. 53 DC Injection Braking Input Timing Diagram
Programming 82
H1=0x=35
Open
OP
PID Block
PI Block
-1
Z
Closed
CLOSED
ON
ON
DC Injection
DC Injection Braking
Start Frequency
(B2-01)
OFF
OFF
Braking