KCZ6SM-3 digital thyristor closed-loop control board

 

   KCZ6SM-3 digital thyristor closed-loop control board is a fully digital thyristor closed-loop trigger control board developed by our company¨s unique KC-198 ASIC chip. It has digital control, The output pulse has good symmetry. It can be used with or without a synchronous transformer in use. It has excellent performance such as self-phase function. It is based on the KCZ6SM-2 digital thyristor trigger control board with protection function to add a closed loop regulator The developed control board can be used to replace the KCZ6.2, KCZ6-1T, JQC3.1 three-phase thyristor full bridge control board originally produced by our company and used for three-phase controllable rectification and three-phase AC adjustment. Pressure system.

I. Main technical parameters and design features

1. Direct 380V power supply, the board contains +15V, +5V, +24V power generation links required for its own work.

2. It has the functions of phase loss, external fault (such as cooling water system fault), undervoltage of its own working power supply, overvoltage and overcurrent protection of the controlled system.

3. The board contains a pulse transformer and pulse isolation and shaping links, and adds a given integral function, and also adds a closed-loop regulator function. The output can directly trigger six 5゛1650A/100゛3500V thyristors.

4. There are only five potentiometers RP1゛RP5 in the board, which are used to adjust the threshold of overvoltage and overcurrent protection and the size of the closed-loop feedback coefficient, as well as the maximum and minimum α angles for phase shift triggering.

II. Normal working conditions

  KCZ6SM-2 digital thyristor open-loop trigger control board can work normally under the following conditions.

1. The altitude does not exceed 1500m;

2. The operating environment temperature is -10゛45≧;

3. The relative humidity of the air is +90% (when the relative ambient temperature is 20≧);

4. There is no conductive, explosive dust, no corrosive and insulating gas around;

5. No severe vibration and shock.

Three, user instructions and wiring method

3.1 Notice to users

1. The KC-198 special control chip in the KCZ6SM-3 digital thyristor closed-loop control board is a programmable logic controller produced in the United States, and the intelligent software compiled by our company is written in it. Since the integrated circuit is a CMOS device, it is in use Be careful to prevent breakdown and damage caused by static electricity, so you must not touch the pins of the KC-198 integrated circuit directly with your hands, and do not use a multimeter to measure the pins of the integrated circuit.

2. The KCZ6SM-3 digital thyristor closed-loop control board adopts four-hole plane installation when installing, and the installation aperture is 4-ф4.5. Figure 1 shows the layout of its components.

3. When installing the KCZ6SM-3 digital thyristor closed-loop trigger control board, the distance between its back and the conductive mounting board should be greater than 20mm, and there should be space for unplugging the connector at the top, bottom, left and right of the mounting position. There should be no heat-generating components within 200mm below the board. .

4. The connecting wire area should be a soft wire of 0.5mm2 or more. The feedback protection signal, the given potentiometer and the pulse output wire should be twisted-pair wires, and no less than 8゛10 twists per 100mm. From the output of the control board G1, K1゛ The leads between G6, K6 and the cathode of the triggered six-way thyristor gate should be as short as possible, and twisted pair or coaxial cable shielded wire should be used as much as possible.

5. The standard use of KCZ6SM-3 digital closed-loop thyristor control trigger board is to directly use the working system without a synchronous transformer. The line voltage is +660V (standard products are based on 380V welding current-limiting resistors when they leave the factory, and they should be ordered when they are higher than 660V or lower than 380V. Note) in the system, when the working voltage of the user system is higher than 660V or the voltage is very low (below 10V), it is recommended to use a synchronous transformer. The secondary side line voltage of the synchronous transformer is 380V. At this time, connect to G1, K1; G4, K4 The synchronous voltage of the arm of the pulse is connected to the TA in the N4 socket of the KCZ6SM-3 control board, and the synchronous voltage of the arm corresponding to the G3, K3; G6, K6 pulse is connected to the TB in the N3 socket of the KCZ6SM-2 control board, and it is connected to the TB in the N3 socket of the KCZ6SM-2 control board. The synchronous voltage of the arm corresponding to the pulses of G2, K2, G5, and K5 is connected to the TC in the N2 socket of the KCZ6SM-3 control board. In this case, disconnect the points 1 and 3 marked A, B, and C on the board Open, and just short 1 and 2.

Figure 1 KCZ6SM-3 digital thyristor closed-loop control board component layout

3.2 Correct wiring

The KCZ6SM-3 digital thyristor closed-loop control board has 11 external connectors. The external wiring method of each connector is as follows:

1. Connectors N1, N2, N3, N4, N5, N6 correspond to G1, K1; G2, K2; G3, K3; G4, K4; G5, K5; G6, K6 are connected to the gate cathode of the triggered six-way thyristor.

2. Pin 1 and pin 2 in the connector CN5 are connected to a 380V power supply.

3. Pin 1 (-15V), pin 2 (GND), and pin 3 (+15V) in the connector CN3 are two positive and negative power supplies for users. The power supply allows a load capacity of 20mA.

4. Pin 3 (P), pin 4 (Ug), and pin 5 (GND) of the connector CN1 are directly connected to the given potentiometer when the user does not need a given integral (the given potentiometer resistance is greater than 4.7kΩ , The power should be greater than 0.5W), in which pin 5 and pin 3 are connected to the fixed end of the potentiometer, and pin 4 is connected to the sliding end of the potentiometer. In this use, pin 6 of the CN1 socket is left unused; when the user uses When a given integral is required, short-circuit pin 3 and pin 4 of CN1, and connect them between pin 6 (RQ) and pin 7 (GND) of CN1 and pin 1 (+15V) of socket CN3 Input a given potentiometer (resistance value greater than 4.7kΩ, power greater than 1/2W), the fixed end of the potentiometer is connected to pin 7 of CN1 and pin 1 of CN3, and the sliding end is connected to pin 6 of CN1, connector CN1 An external fault protection contact (disconnected when fault occurs) is connected between pin 1 (Wp) and pin 2 (GND) to protect against external faults (such as cooling system faults). This protection function is not required At this time, you can delete this function by shorting the two ends. The reset button is connected between pin 8 (RST) and pin 7 (GND) of CN1, which is used to reset the protection (two points are shorted to reset) .

5. Pin 1 (NC), Pin 2 (Z), and Pin 3 (NO) in the connector CN6 are the three terminals of the integrated protection relay, among which pin 2 is the common terminal, and pin 1 and pin 2 There is a normally closed contact, and between pin 1 and pin 3 is a normally open contact, the contact capacity is 220V/1A or 380V/0.5A, any of the three pins is connected to the protection or alarm circuit , As the action contact for breaking the user's main circuit.

6. When the user system voltage sampling is AC sampling, pins 1 to 3 of the connector CN4 are connected to the output of the user system voltage sampling link; at this time, pin 4 (FV) and pin 5 (GND) are left floating. The system voltage sampling is DC, then the voltage sampling value is connected to pin 4 (FV) and pin 5 (pin 4 is the positive terminal), at this time, pins 1 to 3 are floating; the voltage sampling can be AC ??during use For DC sampling, the amplitude is 0゛10V/0.1A.

7. If AC sampling is used for current sampling of the user system, pins 3 to 5 of the connector CN2 are connected to the output of the current sampling link of the user system. At this time, pins 1 and 2 are left floating. If the current sampling value of the user system is DC (for example, when sampling by a Hall current sensor), the pin 1 (FI) of the connector CN2 is connected to the positive end of the sampling, and pin 2 (GND) is connected to the negative end of the sampling. At this time, pins 3 to 5 are suspended. In use, the current sampling can be AC ??or DC. The sampling input should be a signal that converts the current signal into a voltage, with an amplitude of 0-10V/0.1A.

3.3 Function and adjustment method of potentiometer

There are five potentiometers in the KCZ6SM-3 digital thyristor closed-loop control board. The functions and adjustment methods of each potentiometer are as follows:

1. The potentiometer RP1 is used to adjust the actual equivalent sampling value of the physical quantity corresponding to the closed-loop control-voltage (or current). Adjust the sampling value clockwise to increase (equivalent to a decrease in the protection threshold), and adjust the sampling value counterclockwise to decrease (equivalent to As the protection threshold is raised).

2. The potentiometer RP2 is the actual feedback value adjustment potentiometer of the physical quantity that constitutes the closed-loop control-voltage (or current). The feedback value is adjusted clockwise to increase, and the feedback value is adjusted counterclockwise to decrease.

3. Potentiometer RP3 is a physical quantity that does not constitute a closed loop-the actual sampling value of current (or voltage) is adjusted by the potentiometer. Adjust the sampling value clockwise to increase (equivalent to lowering the protection threshold), and adjust the sampling value counterclockwise to decrease (equivalent to increasing the protection threshold) ).

4. Potentiometer RP4 is a given minimum trigger control angle ?Cmin adjustment potentiometer, clockwise adjustment ?Cmin increases, counterclockwise adjustment ?Cmin Decrease.

5. When the potentiometer RP5 is set to zero, the maximum trigger control angle ?Cmax adjusts the potentiometer, clockwise adjusts ?Cmax increases, counterclockwise adjusts ?Cmax Decrease.

3.4 Other issues that should be explained

1. The connector CN2 corresponds to the feedback quantity input channel forming a closed loop, so what amount of closed loop needs to be formed, then connect the sample value of that amount to this channel. If a current closed loop is to be formed, this channel is connected to the current sample value. If a voltage closed loop is formed, Then the channel is connected to the voltage sampling value.

2. The input of connector CN2 is AC sampling value, then the second bit of the DIP switch should be set to the ON position, and the DIP switch corresponding to the DC sampling input should be set Dial 1 bit to the OFF position, and vice versa.

3. The input of the connector CN4 is an AC sampling value, so the 4th bit of the DIP switch should be set to the ON position, and the 3rd bit of the DIP switch corresponding to the DC sampling input should be dialed to the OFF position, and vice versa.

3.5 Parameter restrictions

The input and output load capacity of the KCZ6SM-3 digital thyristor closed-loop control board is:

1. Input parameters:

(1) The power supply is 380V, and the maximum load current is 0.1A.

(2) The maximum range of sampling value input by CN2 socket is 0゛10V/0.1A.

(3) The maximum range of sampling value input from CN4 socket is 0゛10V/0.1A.

(4) TA, TC, TB synchronous input voltage range 30V゛380V/0.1A (can be adjusted by current limiting resistor R1A, R1B, R1C to fulfill).

2. Output parameters

(1) CN3 corresponds to +15V, -15V power supply with a maximum load capacity of 20mA.

(2) The maximum load current of G1, K1゛G6, K6 is 400mA, and the maximum no-load voltage amplitude is +12V.

(3) Six thyristors with thyristor capacity in the range of 5~1650A/100~2500V can be triggered.