YASKAWA E1000 User Manual

5.2 b: Application
Parameter Details
5
YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual 145
■ 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.
Figure 5.14
Figure 5.14 Timer Operation
◆ b5: PI Control
The drive has a built in PI (Proportional + Integral) controller that can be used for closed loop control of system variables
such as pressure, temperature, and so on. The difference between the target and the feedback value (deviation) is fed into
the PI controller. The PI controller adjusts the drive output frequency in order to minimize the deviation, providing
accurate control of system variables.
■
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.
■
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.
■
PI Operation
To better demonstrate how PI works, the diagram below shows how the PI output changes when the PI input (deviation)
jumps from 0 to a constant level.
Figure 5.15
Figure 5.15 PI Operation
■ Using PI Control
Applications for PI control are listed in the table below.
Application Description Sensors Used
Speed Control
Machinery speed is fed back and adjusted to meet the target value. Synchronous control is performed using speed data from
other machinery as the target value.
Tachometer
Pressure Maintains constant pressure using pressure feedback. Pressure sensor
Fluid Control Keeps flow at a constant level by feeding back flow data. Flow rate sensor
Temperature Control Maintains a constant temperature by controlling a fan with a thermostat. Thermocoupler, Thermistor
b4-01 b4-02 b4-01 b4-02
Multi-function Contact
Input: Timer Function
On (Closed)
Off (Open)
On (Closed)
Off (Open)
Multi-function Contact
Output: Timer Function
ON ON
ON ON
common_TMonly
PI input
I control
PI Output
Time
PI output
Time
P control
common_TMonly
SIEP_C710616_35.book 145 ページ ２０１５年１１月３０日 月曜日 午後２時２分

YASKAWA E1000 Specifications

General

Brand	YASKAWA
Model	E1000
Category	Controller
Language	English