Instructions for the Use of KY3-B2 Three-Phase Closed-Loop Trigger

　　

I. overview

　　KY3-B2 three-phase closed-loop flip-flop is the most advanced dedicated SCR phase-shifted trigger integrated circuit introduced from abroad. The output trigger pulse has extremely high symmetry and stability, does not change with the ambient temperature, and has no phase sequence requirements. It contains complete fault protection functions such as phase absence, overcurrent, overheat, etc. It has the advantages of high accuracy, perfect function, simple and reliable use, easy debugging, strong anti-interference and so on. It can be widely used in voltage and current regulation in various fields of industry. It is suitable for resistive load, inductance load, primary side of transformer and various rectifier devices. It is mainly used in high power supply, AC and DC voltage regulation of high frequency equipment, salt bath furnace, power frequency induction furnace, quenching furnace, temperature heating control of molten glass and various industrial furnaces; rectifier transformer, dispatcher, primary side of electric furnace transformer, magnetization and demagnetization regulation, DC motor speed regulation, motor soft start energy saving device; with nickel, ferrochromium, far infrared heating elements and silicon-molybdenum rods. Temperature control of heating elements such as silicon carbon rods, etc.

　　

Ⅱ.Performance characteristics

　　○ The requirement of phase-disorder is limited. It can be used in power supply of 220 V and 380 V power supply frequency of 50/60 Hz power grid.

　　○ It can directly interface with the output signals of various control instruments (temperature controllers) and microcomputers at home and abroad.

　　○ It is suitable for resistive load, inductive load, primary side of transformer and other load types.

　　○ It has soft start and soft stop function, reduces the impact interference to the power grid, and makes the main circuit more safe and reliable.

　　○ Driving power is strong, each circuit can output 800 mA of current, can drive 4000A thyristor.

　　○ It has the functions of phase-absence, over-current and over-voltage protection.

　　○ Fault alarm output function. (External buzzer and indicator)

　　○ Urgent stop function.

　　○ Temperature control and protection function.

　　○ There are three control modes: open-loop, constant current and constant voltage, which can be used in different occasions.

　　○ Integration structure: power supply, synchronous transformer, trigger control circuit and pulse transformer are integrated. Structural tightness, easy debugging, simple wiring.

　　

Ⅲ.Main Technical Indicators and Their Use

　　Input signal: 4-20mA (short connection S1 is selected by P1 jumper) DC 0-5V (short connection S2 is selected by P1 jumper) DC 0-10V (short connection S3 is selected by P1 jumper) 10K potentiometer (manual adjustment)

　　Output Specification: Three-phase or three-phase two-way trigger 0-100% output.

　　Phase shift range: 0-180.

　　Trigger capacity: <4000A thyristor.

　　Indicative function:

　　PW_power indication

　　QX_missing phase indication

　　GLGY_Overcurrent Overvoltage Fault Indication

　　Power usage: AC1 and AC2 are connected to 220VAC main power supply (if users need 380V access, they need to customize it separately).

　　Load test: SCR can not work properly without load or current less than 0.5A when testing trigger. So the load current should be greater than 0.5A.

　　

IV. Working methods

　　1. Open-loop or constant current and constant voltage operation modes:

　　○ The trigger board chooses open-loop or constant-current and constant-voltage mode through open-loop K1 tapping. When debugging trigger board, it is better for users to choose open-loop mode to debug. (K1 please dial to BH position for open-loop control)

　　○ The trigger board can be connected to three-phase current transformer and directly to any two-phase voltage feedback signal of load for constant current and constant voltage control. (Please select short connection S5 and S7 through JP1 and JP3 jumpers for AC closed-loop control).

　　○ The trigger board can also connect the feedback signal of DC 3V voltage and divider 75mV to control the constant current and voltage of DC load.

　　(Please select short connection S4 and S6 through JP1 and JP3 jumpers for DC closed-loop control).

　　○ The trigger board can be sampled according to different requirements. The trigger board can also form an external closed-loop automatic control system with a single chip computer and corresponding detection sensors.

　　2. Three input modes can be selected:

　　○ 4-20mA input. Short connection S1 is selected through JP4 jumper.

　　○ 0-10V input. Choose short connection S2 through JP4 jumper.

　　○ 0-5V input. Select short connection S3 through JP4 jumper.

　　3. External temperature-controlled protection switch and reset switch can be connected: (refer to wiring diagram).

　　4. Soft start regulation:

　　The trigger board can adjust the soft start time through VR3 adjustable resistance setting, and the clockwise direction can adjust the start time to be longer.

　　5. Current limiting and voltage limiting protection:

　　By adjusting VR2, the trigger board sets the threshold of current and voltage limit, and adjusts it clockwise to low. If you use the voltage limiting function, please connect the JP2 jumper and disconnect it when you don't need it.

　　6. Overcurrent and overvoltage protection:

　　The trigger board sets the threshold of overcurrent and overvoltage by adjusting VR1, and adjusts it clockwise to low.

　　

V. Exclusion of Abnormal State

　　1. When the input control signal is small, the SCR is close to 100% output.

　　○ It is possible that the flip-flop has no feedback signal in the closed-loop mode, which results in the incorrect judgment of the integral system of the flip-flop. Please access the closed-loop feedback signal.

　　○ The load current of flip-flop in closed-loop mode is too small.

　　○ Check whether the feedback signal is connected correctly.

　　2. SCR has no output, no current or voltage:

　　○ The panel PW indicator is not on and SCR cannot work. Please check whether the power of the trigger is connected correctly.

　　○ Check whether the QX indicator is on. If it is on, check whether the protection system and synchronization signal are connected.

　　○ Check whether the GLGY indicator is on or not. If the light proves to be over-voltage and over-current protected, please check the power off reset or short reset switch to reset.

　　3. Triggers have problems that users can't solve. Please don't hesitate to contact us.