XMT-808P Intelligent programmable Temperature Controller

XMT-808P programmable Intelligent Temperature controller

Intelligent Temperature Controller, Temperature Controller, Temperature controller

XMT*808 series intelligence temperature controller uses nowadays the most advanced monolithic microcomputer as mainframe，reduce peripheral assembly，and improve the reliability；It adopts the control method of vague theory combined with traditional PID control, and make the control process with the advantage of rapid response、small overshoot、high steady state precision. It is intelligence temperature controller with the function of high performance、high reliability、complete input，its function is suitable to all the occasion needed temperature measurement and control，also be compatible with other industrial parameter measurement and control.

It adopts modular structure，further improve overall performance；The meter is operated with 4-keys,dual row 4-LED display for displaying the measurement value and set value or measurement value and output value, with manual /automatic switch and setting itself function；with characteristic of small volume、low power consumption、convenient operation、steady and reliable of running；They are now widely used for the automatic control system over the area of machinery, chemical, ceramics, light industry, metallurgy, petrifaction, heat treatment industry.

（一）function and concept 

Program StEP: The NO.of the program StEP can be defined from 1 to 30, and the current StEP is the program StEP being executing.

StEP time: the total running time of the whole program StEP. The unit is minute and the available value range from 1 to 9999.

Running time: time that the current StEP has run. As the running time reaches the StEP time, the program will jump to the next StEP automatically.

Jump: the program can jump to any other steps in the range of 1 to 30 automatically as you programmed in the program StEP, and realize cycle control. If StEP NO. Is modified, the program also will jump. Furthermore if the program StEP reaches and finished the 30^th StEP, the program will jump back to the first StEP and run automatically.。

Run/Hold: when program is in the running status, timer works, and set point value changes according to the preset curve. When program is in the holding status, timer stops, and set point remains.

The holding operation can be programmed into the program StEP. When the program meets with the StEP, the StEP time of that is set to zero, or when a jumping StEP jumps to another jumping StEP, the program will get in Hold status. Hold/Run operation can also be performed manually at any time.

Event output: Event output can be programmed in the instrument, it can trigger two alarm contacts to make external equipment operate with interlock.

Power on/power off: means power on of the instrument or unexpected power failure at running status. Altogether 4 handling modes are selectable for user.。

Curve fitting: curve fitting is adopted as a kind of control technology for XMT-808P series instrument. As controlled process often has lag time in system response, by the way of curve fitting the instrument will smooth the turning point of the linear heating-up, cooling-down and constant temperature curves automatically. The degree of the smooth is relevant with the system’s lag time, the longer of the lag time, the deeper of the smooth degree. On the opposite the smooth function will be weaker. Generally the shorter of the process lag time (such as temperature inertia), the better of the program control on effect. By the way of the curve fitting to deal with the program curves, will avoid overshoot. Note: The characteristic of the curve fitting will force the program control to generate fixed negative deviation during the linear heating-up and fixed positive deviation during the linear cooling-down, the deviation is direct proportional to the lag time (t) and the speed of heating-up (cooling-down). This phenomenon is normal.

（二）Program operation

1﹑Setup program 

Press the key once and release in the display status , the instrument will be in the setup program status. At first the instrument will display the temperature setpoint of the current StEP, and the last “unit’s place) decimal point of the data will flash. Press the ▽key to decrease the data, press the △key to increases the data, and press the key to shift the decimal point position (cursor). After finish changing the temperature setpoint, press  SET key once again, the program value (current StEP time) will be display. In each program StEP the temperature and the time is displayed in turn. Modifying the program during running is allowed. When setup the program, press and hold the key ,and press the SET key at the same time, the instrument will exit the program setup status. Press the ▽key may return to set the preceding value.

2﹑Run/Hold

At stoP status, press and hold the ▽key for about 2 seconds in the display status , until the lower display window displays the “Run” symbol, the instrument then will start the program. At running status, press and hold the▽ key for about 2 seconds until the lower display window displays the “Hold” symbol, the instrument will be in hold status. At the status of Hold, READY and AUTO TUNING, the running indicator lamp flashes. At running status, the RUN indicator lap is on. At Hold status, the program is still executing, and the process value is control led around the setpoint, but the timer stop working, and the running time and setpoint remains. At Hold status, press and hold the ▽key for about 2 seconds, until the lower display window displays the “Run” symbol, the instrument then restart.

3﹑Stop

Press and hold the △key for about 2 seconds in the display status  until the lower display window displays the “stoP” symbol, the stoP operation is executed now. This operation forces the instrument to stop running, and the StEP number is reset to 1, the event output is cleared, the control output is also stopped, If user want to restart the program, the running operation can be executed and the program will restart form the 1st StEP.

4﹑Display and modify the running StEP NO.(StEP) of the program 

Some times it is expected that the program begin with a certain StEP, or jump directly to one StEP and execute from there. For example, when the current program reaches the 4th StEP but the user hopes to finish the StEP in advance and execute the 5th StEP, the function of modifying the program StEP number will meet you need. Via setting StEP, XMT-808P series instrument can start the program running from any StEP of 30 steps. If steps of the temperature curve the user needed are less than 30 steps. If steps of the temperature curve the user needed are less than 30 steps, the instrument also allows several different curves to be set and executed individually, if only the total steps (include necessary controls steps) don’t beyond 30 steps. For example, when a process curve only needs nine program steps, it is possible to set three such process curves in the instrument. Changing the StEP number with the production ill call up deferment curve.

To modify the StEP number, press the SET key once and release, the StEP number will be displayed. Press the △, ▽keys to change the StEP number. The StEP number increases or decreases automatically with the program executing. If the StEP number is manually changed, the running time will be cleared to 0 and program will begin with the new StEP. If the StEP number is not change, pressing the SET key will not affect the program running.

Sometimes it need to set special step for the instrument’s complete stop output,so as follows,

Heat control：C30=-999、t30=0,stop heat control and enter into a provisional state.

Cold control：C30=3000、t30=0,stop cold control and enter into a provisional state.

Set the program to 30 step when it need to stop heat or cold,also can set “StEP’to 30

Artificially.

（二）Programming and operation

Programming of XMT series instrument has uniform format of temperature-time-temperature, which means that temperature set current StEP will change to temperature set for next StEP after the time set for the current StEP. The unit of temperature set is ℃ and the unit of time set is minute. The following example includes 6 steps, which is linear temperature heating up, constant temperature, linear temperature cooling down, jump cycling, ready, Hold and event output.

StEP1: C01=100, t01=30 Start linear temperature heating up from 100℃, and the time needed is 30 minutes.

StEP2: C02=400, t02=60 Raise temperature to 400℃, slope of raising curve is 10℃/minute, and the time for temperature to remain constant is minutes.

StEP3: C03=400, t03=120 The StEP for temperature cooling down, slope of cooling curve is 2℃/minute, and the time needed is 120 minutes.

StEP4: C04=160, t04=-35 Temperature cool down to 160℃, then alarm 1 is triggered, and the program jump to StEP5.

StEP5: C05=160, t05=0 The program get in Hold state, and run operation executed by operator is needed for the program to continue running to StEP6.

StEP6: C06=100, t06=-151 Alarm 1 is switch off, and jump to StEP1 to start from beginning.

In this example, it is assumed that the positive deviation alarm is set to 5℃. Because the temperature of StEP 6 is 160℃, and the temperature of StEP1 is 100℃, when program jumps from StEP 6 to StEP1, the program will get in ready state at first, i.e., Control the temperature until the deviation between set point ant PV is less than positive deviation alarm value. After temperature is controlled to 105℃, the program is started up from StEP 1 for temperature heating up. The temperature control block is shown below.

Note: if an alarm condition is satisfied and defined as alarm 1, then alarm 1 cannot be switched off at StEP 6 because alarm 1 is triggered by the alarm occurred.