SPC Type:PID Temperature Controller

SPC Type:PID Temperature Controller

 

    • Frequently uses the parameter may freely arrange to commonly used position
    • T/C,RTD.Linear input selectable
    • Auto/Manual Control mode optional
    • Duplex Output Mode(heat/Cool) Through 2 control processes
    • Alarm Up to 3 alarm set
    • CT for heater break alarm
    • Programmable mode up to 8 ramp/soak segments
    • Operates on any line voltage form 90V AC to 260V AC at 50/60Hz
    • Option RS232 and RS485 communication interface Modbus RTU available
    • Open loop motor valve control
    • Remote set-point
    • Soft start Retransmission output

    PID & Process Temperature Controllers

    Introduction to Temperature Control with PID Controllers


    As the name implies, a temperature controller is an instrument used to control temperature. The temperature controller takes an input from a temperature sensor and has an output that is connected to a control element such as a heater or fan.

    To accurately control process temperature without extensive operator involvement, a temperature control system relies upon a controller, which accepts a temperature sensor such as a thermocouple or RTD as input. It compares the actual temperature to the desired control temperature, or setpoint, and provides an output to a control element. The controller is one part of the entire control system, and the whole system should be analyzed in selecting the proper controller. The following items should be considered when selecting a controller:

    1. Type of input sensor (thermocouple, RTD) and temperature range
    2. Type of output required (electromechanical relay, SSR, analog output)
    3. Control algorithm needed (on/off, proportional, PID)
    4. Number and type of outputs (heat, cool, alarm, limit)

    What Are the Different Types of Controllers, and How Do They Work?

    There are three basic types of controllers: on-off, proportional and PID. Depending upon the system to be controlled, the operator will be able to use one type or another to control the process.

    On/Off Control

    An on-off controller is the simplest form of temperature control device. The output from the device is either on or off, with no middle state. An on-off controller will switch the output only when the temperature crosses the setpoint. For heating control, the output is on when the temperature is below the setpoint, and off above setpoint. Since the temperature crosses the setpoint to change the output state, the process temperature will be cycling continually, going from below setpoint to above, and back below. In cases where this cycling occurs rapidly, and to prevent damage to contactors and valves, an on-off differential, or "hysteresis," is added to the controller operations. This differential requires that the temperature exceed setpoint by a certain amount before the output will turn off or on again. On-off differential prevents the output from "chattering" or making fast, continual switches if the cycling above and below the setpoint occurs very rapidly. On-off control is usually used where a precise control is not necessary, in systems which cannot handle having the energy turned on and off frequently, where the mass of the system is so great that temperatures change extremely slowly, or for a temperature alarm. One special type of on-off control used for alarm is a limit controller. This controller uses a latching relay, which must be manually reset, and is used to shut down a process when a certain temperature is reached.

    Proportional Control

    Proportional controls are designed to eliminate the cycling associated with on-off control. A proportional controller decreases the average power supplied to the heater as the temperature approaches setpoint. This has the effect of slowing down the heater so that it will not overshoot the setpoint, but will approach the setpoint and maintain a stable temperature. This proportioning action can be accomplished by turning the output on and off for short time intervals. This "time proportioning" varies the ratio of "on" time to "off" time to control the temperature. The proportioning action occurs within a "proportional band" around the setpoint temperature. Outside this band, the controller functions as an on-off unit, with the output either fully on (below the band) or fully off (above the band). However, within the band, the output is turned on and off in the ratio of the measurement difference from the setpoint. At the setpoint (the midpoint of the proportional band), the output on:off ratio is 1:1; that is, the on-time and off-time are equal. if the temperature is further from the setpoint, the on- and off-times vary in proportion to the temperature difference. If the temperature is below setpoint, the output will be on longer; if the temperature is too high, the output will be off longer.

    PID Control

    The third controller type provides proportional with integral and derivative control, or PID. This controller combines proportional control with two additional adjustments, which helps the unit automatically compensate for changes in the system. These adjustments, integral and derivative, are expressed in time-based units; they are also referred to by their reciprocals, RESET and RATE, respectively. The proportional, integral and derivative terms must be individually adjusted or "tuned" to a particular system using trial and error. It provides the most accurate and stable control of the three controller types, and is best used in systems which have a relatively small mass, those which react quickly to changes in the energy added to the process. It is recommended in systems where the

  • Model

    SPC484

    SPC489

    SPC964

    SPC727

    SPC969

    Dimension(WxD)

    48x48mm

    48x96mm

    96x48mm

    72x72mm

    96x96mm

    Input Type

    Termocouple

    K,J,R,S,B,E,N,T,W3,W5,PL-II(Input impedance:Approx.1MΩ

    RTD

    PT-100(DIN),JPT-100(JIS)

    Linear Analog

    4~20mA,1~5V…Please refer to Input Type List.

    Controlling Output

    Relay

    Contact,SPST 3A/240V

    Logic Voltage

    Voltage Pulse

    Linear Analog

    4~20mA,1~5V

    Motor Control Output

    Open Loop motor Valve

    Controlling Method

    Prooprtional Band(P)

    0.0~3000

    Integral Time(I)

    0~3600

    Derivative Time(D)

    0~900

    Cycle Time

    0~150

    Dead Band

    0.0~200.0

    Accuracy

    0.2%FS±1DIG(except thermocouple type B&S)

    Alarm Output

    3 Channels(Optional)

    Data Backup Memory

    EEPROM,10Years

    Storage/Operating Environment

    0~65℃/-10~55℃,0~80%RH

    Digi Height(mm)

    PV(Red)

    8

    8

    13

    14

    14

    SV(Green)

    8

    8

    10

    10

    10

    Power Consumption(Approx.)

    3.5VA

    3.5VA

    3.5VA

    3.5VA

    3.5VA

    Power Supply

    AC 90~240V(60/50Hz)

    Net Weight(Approx.)

    130g

    200g

    200g

    200g

    280g


  • What is PID Controller

    proportional–integral–derivative controller (PID controller. or three-term controller) is a control loop mechanism employing feedback that is widely used in industrial control systems and a variety of other applications requiring continuously modulated control. A PID controller continuously calculates an error value  as the difference between a desired setpoint (SP) and a measured process variable (PV) and applies a correction based on proportionalintegral, and derivative terms (denoted PI, and D respectively), hence the name.

    In practical terms it automatically applies accurate and responsive correction to a control function. An everyday example is the cruise control on a car, where ascending a hill would lower speed if only constant engine power were applied. The controller's PID algorithm restores the measured speed to the desired speed with minimal delay and overshoot by increasing the power output of the engine.

    The first theoretical analysis and practical application was in the field of automatic steering systems for ships, developed from the early 1920s onwards. It was then used for automatic process control in the manufacturing industry, where it was widely implemented in pneumatic, and then electronic, controllers. Today the PID concept is used universally in applications requiring accurate and optimised automatic control.

     

    PID controller application

    In theory, a controller can be used to control any process which has a measurable output (PV), a known ideal value for that output (SP) and an input to the process (MV) that will affect the relevant PV. Controllers are used in industry to regulate temperaturepressureforcefeed rate,[15]flow rate, chemical composition (component concentrations), weightpositionspeed, and practically every other variable for which a measurement exists.

    1.Environmental control

    2.Smart Manufacturing Automation

  • Model

    SPC484

    SPC489

    SPC964

    SPC727

    SPC969

    Dimension(WxD)

    48x48mm

    48x96mm

    96x48mm

    72x72mm

    96x96mm

    Input Type

    Termocouple

    K,J,R,S,B,E,N,T,W3,W5,PL-II(Input impedance:Approx.1MΩ

    RTD

    PT-100(DIN),JPT-100(JIS)

    Linear Analog

    4~20mA,1~5V…Please refer to Input Type List.

    Controlling Output

    Relay

    Contact,SPST 3A/240V

    Logic Voltage

    Voltage Pulse

    Linear Analog

    4~20mA,1~5V

    Motor Control Output

    Open Loop motor Valve

    Controlling Method

    Prooprtional Band(P)

    0.0~3000

    Integral Time(I)

    0~3600

    Derivative Time(D)

    0~900

    Cycle Time

    0~150

    Dead Band

    0.0~200.0

    Accuracy

    0.2%FS±1DIG(except thermocouple type B&S)

    Alarm Output

    3 Channels(Optional)

    Data Backup Memory

    EEPROM,10Years

    Storage/Operating Environment

    0~65℃/-10~55℃,0~80%RH

    Digi Height(mm)

    PV(Red)

    8

    8

    13

    14

    14

    SV(Green)

    8

    8

    10

    10

    10

    Power Consumption(Approx.)

    3.5VA

    3.5VA

    3.5VA

    3.5VA

    3.5VA

    Power Supply

    AC 90~240V(60/50Hz)

    Net Weight(Approx.)

    130g

    200g

    200g

    200g

    280g

  • Order Information

                         

    SPC

    Code

    Dimension Size Type

     

    484

    48x48mm

     

    489

    48x96mm

     

    964

    96x48mm

     

    727

    72x72mm

     

    969

    96x96mm

     

     

    Code

    Input Type

     

     

    0

    K-Type

     

     

    1

    J-Type

     

     

    2

    T-Type

     

     

    3

    R-Type

     

     

    4

    E-Type

     

     

    5

    S-Type

     

     

    6

    B-Type

     

     

    7

    N-Type

     

     

    8

    Pt100DIN(Standard Type)

     

     

    9

    Pt100JIS

     

     

    10

    4~20mA

     

     

    11

    1~5V

     

     

     

    Code

    Output#1 Type

     

     

     

    0

    Null

     

     

     

    1

    Relay(Standard Type)

     

     

     

    2

    Pulsed

     

     

     

    3

    4~20mA

     

     

     

    4

    1~5V

     

     

     

    5

    Open loop motor valve

     

     

     

     

    Code

    Output#2 Type

     

     

     

     

    0

    Null(Standard Type)

     

     

     

     

    1

    Relay

     

     

     

     

    2

    Pulsed

     

     

     

     

    3

    4~20mA

     

     

     

     

    5

    1~5V

     

     

     

     

    6

    Transmission

     

     

     

     

     

    Code

    Alarm Type

     

     

     

     

     

    0

    Null(Standard Type)

     

     

     

     

     

    1

    Alarm*1

     

     

     

     

     

    2

    Alarm*2

     

     

     

     

     

    3

    Alarm*3

     

     

     

     

     

     

    Code

    Addition Type

     

     

     

     

     

     

    0

    Null(Standard Type)

     

     

     

     

     

     

    1

    DC-24V

     

     

     

     

     

     

    2

    Remote-SP

     

     

     

     

     

     

    3

    CT

     

     

     

     

     

     

     

    Code

    Communication Type

     

     

     

     

     

     

     

    0

    Null(Standard Type)

     

     

     

     

     

     

     

    1

    RS232

     

     

     

     

     

     

     

    2

    RS485

     

     

     

     

     

     

     

     

    Code

    Program Type

     

     

     

     

     

     

     

     

     

     

    N

    Null(Standard Type)

     

     

     

     

     

     

     

     

    P

    Program

     

     

     

     

     

     

     

     

     

    Code

    Logo

     

     

     

     

     

     

     

     

     

    F

    FGT Logo(Standard Type)

     

     

     

     

     

     

     

     

     



    C

    Customer Logo

     

     

     

     

     

     

     

     

     

     

     

     

     

    SPC

     

     

     

     

     

     

     

     

     

    Complete Ordering Code

     

    *Note:Using customer Logo launch to more than 100 united for  one year