Three-phase open-loop trigger board circuit board design copy board proofing clone production

Three-phase open-loop trigger board circuit board design copy board proofing clone production

1. Parameters

1. AC synchronization signal amplitude: three-phase three-wire, line voltage 380V/50HZ;

2. Trigger board working power: DC 12V±5V regulated power supply, current is less than 1A;

3. Control signal: DC 0～10V voltage (port input resistance> 50KΩ) or 4～20mA current;

4. Trigger pulse technical indicators: pulse width 87°, 110° two, maximum peak current: 800 mA, maximum pulse asymmetry is less than 0.25;

5. Phase shift range: 0～180°;

7. Insulation voltage: Synchronous signal input, trigger signal output and trigger control are isolated by optical coupling and transformer, with dielectric strength ≥2500V/AC;

8. Working environment requirements: ambient temperature -10～+40℃, relative humidity <85%;

2. Description of trigger board port

1. U, V, W: Three-phase AC synchronous power input

Users can change the synchronous sampling resistors (Ru, Rv, Rw) to change the amplitude of the synchronous voltage signal, so that the trigger board can work in a system with different voltage ranges.

2. +12V, GND: Trigger board power supply input, connected to DC 12V±0.5V regulated power supply.

3. +5V, WS: SCR output form selection. When +5V and WS are short-circuited, it is used for SCR AC voltage adjustment, and when it is suspended, it is used for SCR rectification voltage adjustment.

4. 4～20mA, GND: 4～20mA control signal input, directly take the 4～20mA current output signal of the instrument to realize trigger pulse phase shift control.

5. GND, 0～10V, +12V: 0～10V control signal input, the potentiometer will take 0～10V voltage signal from +12V power supply to realize trigger pulse phase shift control.

Only one of the 4-20mA control signal and the 0-10V control signal can be selected. If both are selected, the trigger board will not work normally.

6. +U+, +U-, +V+, +V-, +W+, +W-, -U+, -U-, -V+, -V-, -W+, -W-: six sets of trigger pulse signal output , Corresponding to the three-phase AC synchronization signal input, users should pay attention to the corresponding sequence when connecting!

3. Calculating method of synchronous signal sampling resistance parameter

1. The resistance of the sampling resistance (Ru, Rv, Rw) determines the maximum input synchronization voltage, which can be calculated according to the following formula: resistance (KΩ) = effective value of synchronization voltage (line voltage) × 1.2.

2. When the highest input synchronous voltage is below 250V, the resistance power is 1/4W; when the highest input synchronous voltage is 250~500V, the resistance power is 1/2W.

Fourth, the general troubleshooting method of the control board

1. The control board has no output (that is, no trigger pulse output)

A. Check whether the input power is normal;

B. Check whether the control signal voltage is greater than the initial control voltage of the control board, such as 2V or more.

2. The control board is not controlled (that is, the trigger pulse output by the control board is not controlled by the control signal)

A. Whether the maximum control signal is added to the control board;

B. Whether the output of the main circuit connected to the control board is loaded.

3. The output voltage of the control board is unstable

A. Check whether the input power supply voltage and control signal are stable or whether the power supply voltage ripple is too large;

B. In a closed loop system, if the control board has regular fluctuations, it may be related to the adjustment of the application system rather than the control board.

4. The output voltage is unbalanced when the control board is connected to the bridge arm module to apply inductive load

A. Three-phase unbalanced input power supply voltage;

B. When the inductive load is turned off, there is a high turn-off voltage and is related to the size of the inductive load. The error between the three-phase loads will cause a large voltage imbalance;

C. The unbalanced output voltage is more prominent when the transformer is no-load;

D. The input power or control signal is unstable.

5. The output voltage is unbalanced when the control board is connected to the bridge arm module to control the resistive load

A. Three-phase unbalanced input power supply voltage;

B. Unbalanced load;

C. The input power or control signal is unstable.

Fifth, the outline size and wiring diagram of the trigger board

1. Dimensions of trigger board (see Figure 1)

2、触发板接线图 （见图2、图3）