3 Phase SCR Power Controller

The TSCR series three-phase power regulator (also known as a thyristor power controller) integrates phase-shifting voltage regulation and power regulation into one power controller. It features multiple protection functions such as overcurrent, phase loss, short circuit, wire breakage, and overheating. It uses an imported high-performance microcontroller for control, ensuring high three-phase balance, good waveform symmetry, minimal DC component, good linearity, high control precision, and stable operation. It is widely applicable to resistive loads, inductive loads, and the primary side of transformers in various industrial fields.

Main applications include:

• Temperature control using heating elements such as nickel-chromium, iron-chromium-aluminum, far-infrared heating elements, silicon molybdenum rods, and silicon carbon rods.
• Temperature control of salt bath furnaces, power frequency induction furnaces, quenching furnaces, and molten glass.
• Primary side control of rectifier transformers and electric furnace transformers.
• Stepless smooth adjustment of voltage, current, and power.
• Constant voltage, constant current, and constant power control.

Features:

• Complete isolation between the main circuit and control circuit, ensuring safety and reliability.
• Innovative and unique design, no need for an external synchronous transformer, and the fan uses a 380V power supply without requiring an external power source, with no phase sequence restrictions. Simple wiring and easy maintenance.
• Capable of soft start and speed regulation for AC and DC motors, primary voltage regulation for transformers, welding machines, temperature control, excitation, electroplating, and water treatment.

Technical Parameters:

• Part Numbers: TSCR1-50A, TSCR1-70A, TSCR1-100A, TSCR2-125A, TSCR2-150A, TSCR2-200A, TSCR3-200A,  TSCR3-250A,  TSCR3-300A,  TSCR4-300A,  TSCR4-400A,  TSCR4-500A
• Universal input signals: 4-20mA, 0-20mA, 0-5V, 1-5V, 0-10V, 10K potentiometer, freely switchable.
• Power supply: 380V AC ±10%, compatible with 40-60Hz.
• Load wiring methods: unrestricted delta, star, and star with neutral.
• Automatic phase detection R, S, T, with no phase sequence requirements.
• Output voltage limit, with a range of 0-100%.
• Arbitrary combination of manual and automatic control.
• Soft start and soft shutdown upon power-up (adjustable time up to 60 seconds).
• Built-in limit potentiometer
• LED indicator lights, operation at a glance

1. Transformer Control:

   • A) If the design capacity of the transformer is insufficient, the transformer core may become saturated when the current increases to a certain level, leading to a sharp increase in current, waveform distortion, and device damage. The transformer needs to be redesigned, or a maximum load current limiting function should be added.
   • B) Instantaneous power outages during operation followed by power restoration can cause the magnetic flux polarity at power-on to "collide" with the residual magnetism polarity (inherent residual magnetism and the decaying magnetic field from the instantaneous outage), resulting in harmful surge voltage and current. Therefore, inductive loads, especially transformers, should use a soft start at power-on to gradually magnetize and a soft shutdown to gradually decay the magnetic field.
   • C) Transformers are inductive loads, and narrow pulse triggering is unreliable. Variable pulse width DC triggering technology can provide sufficient time for the load current to reach the holding current of the thyristor, ensuring reliable triggering. Note: Transformer loads should not be tested without load during operation.
     
     

2. Pure Metal Loads: Loads such as silicon molybdenum, molybdenum wire, tungsten, platinum, and graphite have low cold-state resistance and require voltage and current limiting at low and medium temperature ranges. As the temperature increases, the resistance increases linearly, and at high temperatures, the load voltage needs to be increased. The current limiting function of the TSCR voltage regulator is specifically designed for these types of loads. Additionally, instruments with multiple PID groups and adjustable output limits can also control load current. For example, FP93, SR23, FP23, SRS10, etc., can be designed to limit the adjustment output in low, medium, and high-temperature zones.
   
   

3. Silicon Carbide Rods: Generally, a soft start of more than 1 minute or longer and current limiting are used to avoid the impact current of negative resistance near 700°C (more pronounced with new rods).
   
   

4. Constant Resistance Loads (referring to loads with small changes in cold and hot resistance): The control strategy is relatively simple and can use zero-crossing power control to overcome the low power factor and grid pollution of voltage regulation methods. Cycle zero-crossing (duty cycle control) is generally implemented using high-power SSRs. Cycle zero-crossing power control distributes the load current evenly in units of full sine waves. When multiple devices are running, the total power current is relatively balanced (avoiding current concentration in cycle zero-crossing mode), improving furnace temperature uniformity, avoiding ammeter needle collisions, and importantly, increasing power utilization and avoiding the need for power equipment capacity expansion, resulting in significant energy savings. TSCR is an integrated design for power and voltage regulation, capable of both voltage and power regulation (cycle and cycle zero-crossing methods), meeting different control strategies.