Three-phase closed-loop trigger board circuit board design copy board proofing clone production
The SB6T-1 three-phase closed-loop trigger board is composed of a given integrator, voltage, current sensor, PI regulator, phase shift trigger, protection circuit and DC power supply. It can work in two closed-loop adjustment modes: voltage-limiting and current-limiting or current-limiting and voltage-stabilization; it can also operate in open-loop mode to achieve open-loop control. Realize the soft start of output voltage and current by adjusting the given integrator parameters, reducing the impact on the equipment.
Onboard Hall voltage sensor. The current sensor needs to be connected externally, and there are two different types of current sensor input interfaces, which can meet the needs of different users for choosing different sensors.
The trigger board has phase failure protection, overcurrent protection and various LED status indications.
SB6T-1 can be used in various three-phase bridge half-control, full-control or double anti-star controllable rectifier circuits with balanced reactors and SCR anti-parallel three-phase AC voltage regulating circuits (such as electroplating, electrolysis, charging Discharge, motor excitation, AC voltage regulation on the primary side of the transformer, etc.).
2. Parameter index
2.1 AC sync signal amplitude
Three-phase three-wire, line voltage 380V/50HZ.
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 be used in different voltage systems. See the attached page for the calculation method of step-down resistance.
2.2 Trigger board working power
Single-phase AC, voltage 380V, current 0.5A
2.3 Voltage sensor
This trigger on-board Hall voltage sensor, users do not need external voltage sensor.
2.4 Current sensor
The user can choose two different forms of current sensors to input from different interfaces.
①Factory standard hall sensor
②Current transformer, generally use two-level mutual inductance method:
First select according to the rated current. If the user current is 250A, you can choose a 300: 5 current sensor, and then a standard 5: 0.1 current transformer.
2.5 Trigger board given signal power
Maximum voltage 10V, maximum current 10mA
If the user adopts instrument or computer control, this pin is suspended, but the current limiting and voltage limiting functions are not available, and the over-current protection is available.
2.6 Given signal
DC 0～10V DC, port input resistance> 50KΩ
2.7 Phase shift range: 0～180°
2.8 Trigger pulse technical indicators
Pulse width: 87°, 110° two kinds
Maximum peak current: 800 mA
Maximum pulse asymmetry: less than 0.25°
2.9 Soft start and stop time: 0～30 seconds
2.10 Alarm output
When the synchronization signal is lost or the load is overcurrent, the normally open point is closed and the normally closed contact is disconnected.
Contact capacity: AC 250V, 1A
2.11 Insulation voltage
The voltage and current feedback sensor and the trigger board are isolated by Hall components, with a dielectric strength ≥2500V AC; the control board trigger and the main circuit of the thyristor are isolated by a transformer. Dielectric strength≥2500V AC
2.12 Working environment:
Ambient temperature: -10～+40℃
Relative humidity: <85%
No conductive explosive dust, no corrosive gas, no violent vibration or impact
2.13 Shape (unit: mm)
Maximum size: 218×140×47
Installation size: 195×126
Positioning hole size: φ6
3. Trigger board components use adjustment method
The main identification of the trigger board is shown in Figure 1 [Figure 1 (A) is the full control trigger board, and Figure 1 (B) is the half control trigger board]
3.1 LED status indication of trigger board (Table 1)
Status when the LED is lit
Lack of phase protection, lack of more than one sync signal
Steady flow state
+12V power supply is normal
-12V power supply is normal
+UL, +VL, +WL, -UL, -VL, -WL
Trigger pulse output is normal
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