B4: Delay Timers; B5: Pid Control - YASKAWA V1000 Technical Manual

5.2 b: Application
n b3-29: Speed Search Induced Voltage Level
Performs Speed Search when the motor induced voltage exceeds the set level.
There is normally no need to change this parameter from the default value. Lower this value in small increments if changes
are necessary. However, setting this value too low will prevent the drive from performing Speed Search.
No.
b3-29
u

b4: Delay Timers

The timer function is independent of the drive operation and can be used to delay the switching of a digital output triggered
by a digital input signal. An On-delay and Off-delay can be separately set. The delay timer can help to get rid of chattering
switch noise from sensors.
To enable the timer function, a multi-function input must be set to "Timer input" (H1-oo = 18) and a multi-function
output must be set to "Timer output" (H2-oo = 12). Only one timer can be used.
n b4-01/b4-02: Timer Function On/Off-Delay Time
b4-01 sets the On-delay time for switching the timer output. b4-02 sets the Off-delay time for switching the timer output.
No.
b4-01
b4-02
n Timer Function Operation
When the timer function input closes for longer than the value set in b4-01, the timer output switches on. When the timer
function input is open for longer than the value set in b4-02, the timer output function switches off. The following diagram
demonstrates the timer function operation.
Multi-function Contact
Input: Timer Function
Multi-function Contact
Output: Timer Function
u

b5: PID Control

The drive has a built in PID (Proportional + Integral + Derivative) controller that can be used for closed loop control of
system variables such as pressure, temperature etc. The difference between the target and the feedback value (deviation)
is fed into the PID controller. The PID controller adjusts the drive output frequency in order to minimize the deviation,
providing an accurate control of the system variables.
n P Control
The output of P control is the product of the deviation and the P gain so that it follows the deviation directly and linearly.
With P control only an offset between the target and feedback remains.
n I Control
The output of I control is the integral of the deviation. It minimizes the offset between target and feedback value that
typically remains when pure P control is used. The integral time (I-time) constant determines how fast the offset is
eliminated.
n D Control
D control predicts the deviation signal by multiplying its derivative (slope of the deviation) with a time constant and adding
this to the PID input. This way the D portion of a PID controller provides a braking action to the controller response and
can reduce the tendency of oscillations and overshoot.
Be aware that D control tends to amplify noise on the deviation signal, which can result in control instability. D control
should therefore only be used when necessary.
n PID Operation
To better demonstrate how PID works, the diagram below shows how the PID output changes when the PID input
(deviation) jumps from 0 to a constant level.
130
Name
Speed Search Induced Voltage Level
Name
Timer Function On-Delay Time
Timer Function Off-Delay Time
ON
ON
b4-01 b4-02
Figure 5.15 Timer Operation
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
Setting Range
0 to 10%
Setting Range
0.0 to 300.0 s
0.0 to 300.0 s
ON
ON
b4-01 b4-02
Default
10%
Default
0.0 s
0.0 s
On (Closed)
Off (Open)
On (Closed)
Off (Open)