Operation manual of ky3-c three-phase AC closed-loop trigger
I. overview
Ky3-c three-phase closed-loop trigger is the most advanced SCR phase-shift trigger integrated circuit imported from abroad. The output trigger pulse has 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 loss, overcurrent, overheating, etc. it has the advantages of high precision, perfect function, simple and reliable use, easy debugging, strong anti-interference, etc. It can be widely used in voltage and current regulation in various fields of industry, and it is suitable for resistive load, inductive load, primary side of transformer and various rectifying devices. It is mainly used in high-power power supply, AC / DC voltage regulation, salt bath furnace, power frequency induction furnace, quenching furnace, temperature heating control of molten glass and various industrial furnaces; rectifier transformer, shunting machine, primary side of furnace transformer, magnetization and demagnetization regulation, DC motor speed control, single-phase motor soft start energy-saving device; nickel, ferrochrome, far-infrared heating elements and silicon molybdenum rod, silicon Temperature control of heating elements such as carbon rod, etc.
II. Performance characteristics
There is no phase sequence requirement limitation, and it can be used for power grid with power frequency of 220V and 380V and power frequency of 50 / 60Hz.
It can directly interface with the output signals of various control instruments (temperature controllers) and microcomputers at home and abroad.
It is applicable to various load types such as resistive load, inductive load and primary side of transformer.
It has the function of soft start and soft stop to reduce the impact on the power grid and make the main circuit more safe and reliable.
Strong driving ability, each circuit can output 800 ma current, can drive 4000A thyristor.
It has the functions of phase loss, over-current and over-voltage protection.
○ fault alarm output function. (external buzzer and indicator)
Emergency stop function.
Temperature control protection function.
There are two control modes of open-loop and closed-loop, and there are two pulse operation modes, which are applied to different loads.
Integrated structure: power supply, synchronous transformer, trigger control circuit and pulse transformer are integrated. Compact structure, easy debugging, simple wiring.
III. main technical indicators and use
Input signal: 4-20mA (select short circuit S1 through P1 jumper) DC 0-5V (select short circuit S2 through P1 jumper) DC 0-10V (select short circuit S3 through P1 jumper) 10K potentiometer (for manual adjustment)
Output specification: three-phase or three-phase two-way trigger 0-100% output.
Phase shift range: 0-180.
Trigger capacity: ≤ 4000A thyristor.
Indication function:
PW · power indication
Glgy · over flow pressure fault indication
QX? Phase loss indication
Off fault indication
Use of power supply: AC1 and ac2 are connected to 220V or 380V main power supply. When inputting 380V main power supply, please select the input through jp5 jumper, otherwise the transformer will be damaged (select 220V input when leaving the factory).
Load test: when the trigger is tested, the load is not connected or the current is less than 0.5A, and the SCR cannot work normally. So the load current should be greater than 0.5A.
IV. working methods
1. Two operation modes, open-loop or closed-loop:
The trigger board selects open-loop or closed-loop mode through JP8 jumper. When debugging the trigger board, it is better to ask the user to select the open-loop mode first. (if the open-loop is used, please select short circuit to short S4, and the closed-loop is S5)
The trigger board can be connected to three-phase current transformer and directly connected to any two-phase voltage feedback signal of load for constant current and constant voltage control.
The trigger plate can be sampled according to different requirements. The trigger board can also form an external closed-loop automatic control system with a single-chip microcomputer and corresponding detection sensors.
2. Three input modes can be selected:
○ 4-20mA input. Select short circuit S1 and S3 through jumper combination.
○ 0-10V input. Select short circuit S2 and S3 through jumper combination. (S3 is not short circuited to 0-5V control)
○ 0-5V input. Select short circuit S2 through jumper. (S3 is not short circuited)
3. External protection switch available: (refer to control wiring diagram)
4. Pulse prohibition output (off control switch):
Trigger board can be controlled by emergency stop of external switch (off switch can also be connected with temperature control protection switch, etc.).
5. Two pulse control modes:
The trigger board can select two different output pulse modes through JP6 jumper, which is more effective in different working situations.
6. Overcurrent protection:
When the trigger board is short circuited to jp9, the over-voltage and over-current protection value is set by adjusting the variable resistance VR2.
V. troubleshooting of abnormal state
1. When the input control signal is small, SCR is close to 100% output:
It is possible that the trigger is not connected to the feedback signal in the closed-loop working mode, which leads to misjudgment of the trigger integration system. Please connect to the closed-loop feedback signal.
The load current is too small when the trigger is in the closed-loop operation mode.
Check whether the feedback signal is connected correctly.
2. SCR has no output, no current or voltage:
The PW indicator light on the panel is not on, and the SCR cannot work. Please check whether the power supply of the trigger is connected correctly.
Check whether QX indicator light is on. If it is on, please check whether protection system and synchronization signal are connected.
3. If the trigger has problems that the user can't solve, please don't hesitate to contact us, we will solve it for you in time.