After heating for a while, the temperature does not change. Displays the ambient temperature of the site at all times (e.g. room temperature 25°C)
In case of such a fault, first check whether the SV value setting value is set, whether the OUT indicator of the meter is lit, and whether the No. 3 and No. 4 terminals of the meter are 12VDC output with the "multimeter". If the light is on, terminals 3 and 4 also have a 12VDC output. This indicates that the problem is with the control device of the heating element (e.g.; AC contactors, solid-state relays, relays, etc.), check whether the control device has an open circuit, whether the device specification is wrong (such as a 380V device connected to a 220 circuit), and whether the circuit is connected to the wrong one. Also, check the sensor for a short circuit (the meter always shows room temperature when the thermocouple is shorted).
Heating for a while, the temperature display is getting lower and lower
In case of such faults, the positive and negative polarity of the sensor is generally reversed, and the input terminal wiring of the instrument sensor should be checked (thermocouple: 8 to the positive pole, 9 to the negative pole; PT100 RTD: 8 to monochrome wires, 9 and 10 to two wires of the same color).
After heating for a period of time, the temperature value (PV value) displayed by the meter measurement is very different from the actual temperature of the heating element (e.g., the actual temperature of the heating element is 200 °C, while the meter shows 230 °C or 180 °C)
In case of such faults, first check whether the contact point between the temperature detector head and the heating element has loose and other poor contact phenomena, whether the temperature measurement point is selected correctly, and whether the specification selection of the temperature sensor is consistent with the input specification of the temperature controller (for example, the temperature control meter is a K-type thermocouple input, and the J-type thermocouple is installed on site to measure the temperature).
The meter PV window displays HHH or LLL characters
If such a fault occurs, it means that the signal measured by the meter is abnormal (LLL is displayed when the measurement temperature of the meter is lower than -19°C, and HHH is displayed when the measurement temperature is higher than 849°C). Solution: If the temperature sensor is a thermocouple, you can remove the sensor, directly use the wire to short the thermocouple input terminals (8 and 9 terminals) of the instrument, after powering on, if the instrument can display the room temperature normally (on-site ambient temperature such as: 30 °C), then the problem lies in the temperature sensor, use a multimeter tool to detect whether the temperature sensor (thermocouple or PT100 thermal resistance) has an open circuit (broken wire), whether the sensor wire is reversed, wrong, or the specifications of the sensor are inconsistent with the instrument. If all of the above problems are ruled out, the internal temperature measurement circuit of the meter may be burned due to leakage of the sensor.
The control is out of control, the temperature exceeds the set point, and the temperature keeps rising
In case of such a fault, first check whether the OUT indicator of the meter is lit at this time, and whether the No. 3 and No. 4 terminals of the DC voltage level measuring instrument with the "multimeter" have 12VDC output. If the lights are not on, there is no 12VDC output at terminals 3 and 4. This indicates that the problem is with the control device of the heating element (e.g.; AC contactors, solid state relays, relays, etc.). Solution: Check whether the control device has a short circuit, the contact cannot be opened, and the wrong line is connected in real time.
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RKC thermostat operation attention and its main features
RKC thermostat operation attention
· Clean the instrument only after the power is off;
· Please use a soft cloth or cotton paper to remove stains on the monitor;
· The display is easy to be scratched, it is forbidden to use hard object to operate the panel buttons, otherwise the keys will be damaged or scratched.
Key features:
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Features and technical specifications of RKG thermostats
peculiarity
1. Thermocouple, RTD, analog and other signals are freely input, and the range can be set freely.
2. The software adjusts the full degree, the cold end measures the temperature separately, the amplifier is self-stabilizing, and the display accuracy is better than 0.5%FS.
3. Fuzzy theory combined with traditional PID method, fast control ...
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RKC thermostat - introduction of the three output modes of the thermostat
The first output method is relay output, which is output for temperature control through the switching signal of the relay on/off, which is used to directly control the load less than 5A, or directly control the contactor and the intermediate relay, and control the high-power load externally through the contactor.
The second ...
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Wiring method and control method of RKC thermostat
1. Wiring method
Take CD901 as an example,
L(1) pin to 220 volt live wire,
N(2) pin 220 volt neutral wire,
3,4 pins for the first output,
5,6 pins for the second output,
7, 8, 9 pins are alarm output,
The last three legs are connected to ...
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RHK thermostats – an introduction to the classification of displays
(1) Categorize by display color
1. Monochrome display
There are two types of displays: multi-grayscale monochrome display and VGA multi-frequency monochrome display. These displays are small, lightweight, clear and inexpensive, making them suitable for highly mobile workplaces.
2. Color ...
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RKC Level Gauge - the principle of the selection of float level gauges
The float level gauge is widely used, mainly used in petroleum processing, food processing, chemical industry, water treatment, manufacturing, electric power, papermaking, metallurgy, ships and boilers and other industrial automation processes to measure and control the level.
1. Pay attention to the specific working conditions. As introduced ...
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RLC Thermostat - Introduction to the function of mechanical temperature control
1. The temperature setting is set by the knob, which is convenient and intuitive 2. It can be directly installed on the standard junction box on the wall.
3. Beautiful appearance and reliable performance.
4. The switch adopts toggle type, which feels comfortable and has a long life.
5. It can control two-wire or three-wire electric (ball...
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RKC converters – what are the functions of converters?
1. Power conversion: convert the voltage (rated 100V) and current (rated 5A or 1A) of the transformer into voltage (several volts) to meet the requirements of weak current components.
2. Isolation: current, secondary side security, and work grounding are used to ensure the safety of people and equipment, while weak current ...
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RK Thermostat - Part of the LCD shows the status quo of floor heating thermostats
1) The LCD interface is too large or the display symbols are not proportional or standard.
2) The terminal blocks or circuits (components) that control the output cannot withstand large currents.
3) The cable of the external sensor (ground probe) is a thin and flexible wire, which cannot be inserted into the embedded pipe, and it is also a hidden danger for future maintenance.
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RKC Level Gauge – How to install a buoy level gauge
1. Welding and installation of the lower support of the guide wire: determine the position at the bottom of the container according to the requirements of the movement direction of the float of the level gauge, and weld or rivet the lower support of the fixed guide wire. If the equipment does not have welding conditions, the heavy anchor fixing method can be used to fix the guide wire under the support. For example, the liquid level wave in the container ...
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RKC thermostat - what are the anti-interference measures of the instrument?
1. Electromagnetic induction (refers to the coupling of magnetism). There is a strong alternating magnetic field in the surrounding space of high-power transformers, AC motors, high-current power grids, etc., and the closed loop formed by the lines of the control system (detection, transmission, conversion, regulation, calculation, execution, auxiliary, display, etc.) is located in the ...
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RKC Thermostat Usage Warning
· Wiring warning:
- If the instrument fails or an error occurs, which can cause a system failure, install external protection circuits to prevent such accidents;
- To prevent damage or failure of the instrument, use appropriate fuses to protect the power cord and input/output cord from strong power shocks.
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The main technical indicators of RKC thermostat
The main technical indicators of RKC thermostat
· Input: various thermocouple (TC), RTD standard current and voltage signals (see input type table);
· basic error: 0.5% of the input full-scale ±±1 word;
· Resolution: 1°C, 0.1°C;
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Precautions for the use of RKC thermostats
fold
When the RKC thermostat comes out, it is a single-loop regulator, that is, it only has a heating function, which is called the basic meter, which is generally sent to the agent, and the agent will expand the multi-channel adjustment and alarm output control function, which is called "changing the meter" in the industry, so as to ensure that there is very little hardware cost.
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RKC Level Gauge – Buoy Level Gauge Use and Precautions
1. Support welding under the guidewire:
According to the direction of the movement of the buoy of the level gauge, determine the position at the bottom of the container, and fix the guide bracket (piece 1) under the welded or riveted steel wire
2. Install the guide rail joint.
(1) Straighten the wire forcefully and fix it at the lower support, taking care not to ...
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What are the rich functions of RRKC thermostats – wall mounted thermostats?
The wall-mounted thermostat is an ultra-thin intelligent thermostat that integrates measurement, display, control, alarm, recording and other functions, which can realize accurate measurement and control of temperature, pressure, flow and other parameters. Available in three sizes of 5 inches, 7 inches and 9 inches, a total of 12 models are available ...
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RKC Level Gauge – Four mounting methods for buoy level gauges
1. The buoy level gauge is welded and installed under the guide wire
At the bottom of the container, determine the position according to the requirements of the movement direction of the level gauge buoy, and weld or rivet the support under the fixed guide wire.
2. Buoy level gauge ruler installation
1. The connecting part of the ruler should be flat.
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RKC Level Gauge – The structure of a float level gauge
(1) For the indicator, also known as the display panel, the indicator plays the role of local display, convenient for long-distance observation of the actual situation of the liquid level, the indicator is generally bundled with the pontoon, easy to install.
(2) It is a magnetic float, which is located in the pontoon and is in direct contact with the liquid to be measured, ...
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RRKC thermostats – how are temperature controllers wired and commissioned?
1. Take out the room temperature controller, and then connect the power supply terminal of the temperature controller to the power supply according to the terminal diagram of the temperature control chart
2. Then take out the temperature sensor that comes with the temperature controller and detect it
3. According to the temperature controller terminal, the temperature sensor is connected to the controller's transmission.
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RK Thermostat - 5 Common Faults of Thermostat and Solutions
1. After heating for a period of time, it is found that the temperature has not changed, and the temperature has been displayed at the time of the ambient temperature.
In this case, you need to check that the SV value setting value is set, whether the OUT value indicator of the meter is not lit, and whether the No. 3 and 4 segments of the universal meter are 12VD ...
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