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XMTD-702 series temperature control instrument operation manual
First, the product overview
The XMT702 series temperature control instrument is an upgraded product of the XMT701 type instrument. The instrument adopts the European main control chip, which has the characteristics of stable operation and reliable operation. The meter is a two-row digital display with the upper row showing the temperature measurement and the lower row showing the temperature setting. The meter also has functions such as heating indication, over temperature indication and adaptive (auto-tuning). This product is especially suitable for water temperature control, oil temperature control, electric furnace temperature control, oven temperature control.
The XMT702 series temperature control instrument has strong field adaptability, and more open parameters can be adapted to many control systems. The flexible control menu makes field operations easier and easier. Optimized hardware design enhances the overall reliability of the instrument.
First, the operating instructions
1 . Set the temperature : press the SET button to set the temperature, press the SET button to flash the digital tube data (the upper row is normally measured), then the meter enters the temperature setting state, press the â–³ button to increase the value, press the â–½ button The set value decreases. Pressing the increase button or decreasing button will change the value quickly. Press the shift button to move the cursor to facilitate quick setting. After the temperature is set, press the SET button again to return to the normal working state. .
2 . Correction of sensor error : The displayed value can be corrected when it is confirmed that the value displayed by the meter is not the correct measurement value. Press the SET button for 3 seconds to enter the inner menu of the instrument. After selecting the parameter SC, use the â–³ or â–½ key to modify this parameter. The correction range of the sensor error is -50 degrees to +50 (the range of the instrument is 99.9 degrees to -9.9 degrees to +9.9 degrees). After the correction is completed, press the SET button for 3 seconds to exit. When the instrument is shipped, the correction value is 0. When using it, it should be prevented from correcting the correct display to incorrect.
3 . Start self-tuning : This product can adapt to most control systems, and can only start self-tuning when the control effect is particularly unsatisfactory. Self-tuning is the meter automatically adapts to the current
The process of heating the system and selecting operating parameters. There are two ways to start auto-tuning.
Method 1: Press and hold the shift button for three seconds to enter the auto-tuning state. At this time, the At indicator light starts to flash and the instrument enters the auto tuning parameter working state. The meter control heating system pays near the fluctuation twice. When the At light is off, the auto tuning is finished, and the new PID parameter is latched in the chip.
Method 2: Press the SET button for 3 seconds to enter the inner menu of the instrument. After selecting the parameter At, press the â–³ or â–½ key to change the lower row OFF to ON and then press the SET button for 3 seconds to exit the setting state and also enable the auto-tuning.
Second, the operation process
1. Set the temperature : press the set key → set the temperature → press the △ key to increase the set value, press the ▽ key to decrease the set value → press the set key again to set the temperature.
2. Set the internal function parameters : press the set button for 3 seconds to enter the internal menu → modify the internal parameters to adjust the basic functions of the instrument → after the internal parameters are modified, press the set button to exit the function menu. For definitions of internal function parameters, see the Inner Parameter Table. Note: The inner layer function parameters are generally not arbitrarily adjustable, otherwise it may cause loss of control.
Third, the definition of user working parameters and "inner parameter table"
Press the SET button for 3 seconds to enter the inner parameter setting state.
Parameter code
Parameter meaning
Description
Setting range
Factory default
AL1
Upper limit alarm
Set the upper limit deviation alarm value
0-50
5
AL2
Lower limit alarm
Set the upper limit deviation alarm value
0-50
10
FAL
Alarm action
Alarm output action insensitive area
P
Proportional band
If P=0, it is a bit control. When the P value is not zero, the meter is a proportional output type PID control, and P is a dynamic working range.
1°C-200°C
30
Hyc
Main output hysteresis
This parameter can only appear when P=0, Hyc is the main output action insensitive zone.
0-50
2
I
Integration time constant
Eliminate the static difference and the intensity of the meter's regulation of the output energy. The smaller the I value, the stronger the control ability.
0-999 seconds
240
d
Differential time constant
Pre-adjustment ability, the speed of regulation of output energy when the measured value changes. The higher the D value, the faster the reaction speed
0-999 seconds
60
t
Proportional cycle
The sum of heating and termination times is one cycle. The meter determines the output power by adjusting the heating and termination time
1-200 seconds
20
Sc
Measured value offset
The sensor error is corrected. If the measured temperature is high, it will be corrected upwards, otherwise it will be corrected downward.
-50 ° C - 50 ° C
0
AT
VDF
The meter automatically adapts to the heating system: 0 is off, 1 is on
0, 1
0
EP
Anti-overshoot
It can reduce the overshoot generated when the meter is turned on every time. Generally, it will add a few degrees after a few degrees of overshoot.
10
100
Lck
Parameter lock
0: not locked; 1: locks the parameter except the set value 2: lock all parameters
0-2
0
Parameter description :
AL1: Over temperature alarm parameter, when the temperature exceeds the set value plus AL1 value, the ALM indicator lights. Example: Set the temperature to 100. AL is adjusted to 10. The meter generates an alarm when the temperature reaches 100+10=110. At this time, the AL1 indicator lights and the alarm relay operates.
AL2: Low temperature alarm parameter, the AL2 indicator lights when the temperature exceeds the set value minus the AL2 value. Example: Set the temperature to 100. AL is adjusted to 10. The meter generates an alarm when the temperature reaches 100+10=110. At this time, the ALM indicator lights up and the alarm relay operates.
FAL: Overshoot reduction parameters. Used for temperature overshoot control during each cold start.
P: is the proportional band, that is, the proportional control value. The meter is distributed with the set value as the center P value on both sides of the set point. In the range of P value, the meter works in PID mode. Example: Set the temperature to 100 degrees. When P=30, the range of automatic meter control is 85-105 degrees (that is, within 30 degrees). Full power heating below 85 degrees, full cut-off heating above 105 degrees.
HYc: The hysteresis of the main output action prevents the output relay from frequently moving around the temperature balance alarm when the position control (P=0). HYc can also be used as the lower limit control point for positional hysteresis control. Example: Set the temperature to 100. FAL is adjusted to 10. When P = 0, the heating stops when the temperature rises to 100, and starts heating again when the temperature drops to 100-10 = 90 degrees. The 100 master is the upper limit control point, and the 90 degree is the lower limit control point.
I: Used to eliminate the static difference. The actual measured temperature minus the set temperature is called static difference. The magnitude of the I value can be understood as the theoretical time corresponding to the elimination of the static difference. The magnitude of the I value is related to the power and insulation properties of the heating system. Generally, if the value of I is too small, temperature overshoot will occur, and too much will affect the heating rate. Usually take 80-360 seconds.
D: Overshoot control, the meter will make a control response during the differential time D when the temperature fluctuates. The meter calculates the increase or decrease of the control output energy according to the magnitude of the D value combined with the speed of the fluctuating temperature. Too large a D value will cause fluctuations, and too small a system will react slowly. Usually 10-40 seconds.
T: It is the heating output cycle period, that is, the relay working cycle period, the T value is small, the control effect is good, but the T value is too small, the relay will reduce the life due to frequent work. Generally, the T value is 20-60 seconds.
SC: Error correction.
AT: Self-tuning parameters, the instrument automatically measures and adapts the heating system after the self-tuning is started. The self-tuning instrument control heating system fluctuates twice near the temperature set point, and automatically calculates the P, I, D suitable for the system. Control parameters. After the self-tuning is finished, the instrument controls the controlled system according to the new P, I, and D parameters.
LCK: Parameter lock to prevent misoperation.
Fourth, matters needing attention
1. The meter displays that HHH is the measured value that is out of the meter range or the thermocouple is broken. It shows that LLL is the measured value lower than the lower limit of the meter range.
2 . The meter display is normal, the temperature suddenly loses control, and the external load should be checked for short circuit or open circuit. Some people must be on duty during the work of this instrument.