The ST35 three-phase rectifier thyristor trigger board employs a 32-bit industrial-grade high-performance microprocessor. It is specifically designed for regulating positive and negative voltages in reversible applications. One three-phase bridge is used for forward output, while another three-phase bridge is used for reverse output. It supports both network remote control and on-site control methods, with open Fuzzy-PID parameter adjustment. The board integrates three regulation modes—open-loop voltage regulation, closed-loop constant voltage, and constant current—to control thyristors for constant voltage with current limiting or constant current with voltage limiting, all designed to meet safety standard specifications.

It features fault alarms and a user interface with parameters displayed via an LCD screen with a Chinese menu. Set parameters are automatically stored. The control board includes functions such as phase-loss protection, soft start on power-up, soft shutdown, constant current output, constant voltage output, overvoltage protection, overcurrent protection, short-circuit protection, and operational status indication.

It utilizes three-phase full-control bridge rectification and anti-parallel thyristor AC triggering methods. It can trigger thyristors rated up to 5000A and is suitable for various load types requiring voltage and current regulation across industrial fields, including resistive, inductive, capacitive, and transformer primary side loads. It is widely used in equipment such as electrolysis, electroplating systems, and charging/discharging power supplies.

Technical Specifications:

Power Supply: 220/380Vac ±15%, 50/60Hz

Main Circuit Operating Voltage: 380/660Vac ±15%, 50/60Hz

Voltage Adjustment Range: 0 to full-scale voltage

Current Adjustment Range: 0 to full-scale current

Display Method: LCD screen with Chinese menu

Phase Shift Range: 0–178°

Adjustment Output Resolution: 1/4000

Stability Accuracy: Better than ±1%

Trigger Current: ≥ 750mA

Trigger Capacity: ≤ 5000A unidirectional thyristor

PID Dynamic Response Time: ≤ 50ms

Overshoot: ≤ 10%

Input Signals: DC 0-5V, DC 0-10V, 0-10mA, 4-20mA, 10K potentiometer adjustment

Three-Phase Trigger Imbalance: ≤ 0.3°

Suitable Loads: Resistive, inductive, capacitive, transformer primary side, and other loads

Alarm Relay Contact Rating: 250Vac / 10A

Dielectric Strength: 3500 VRMS

Dimensions: 240 × 160 × 50 mm

Panel Cutout Dimensions: 225 × 145 mm

Weight: 1.3 kg

Operating Environmental Conditions:

Ambient Temperature: -20°C to 60°C

Relative Humidity: ≤ 90% RH (non-condensing)

Indoor Installation: Environment free from flammable, explosive, corrosive gases, and conductive dust; vibration less than 0.5G.

Altitude: Below 3000 meters. For altitudes exceeding 3000 meters, appropriate derating of capacity should be applied.

Product Compliance Standards:

IEC 60947-4-2: Low-voltage switchgear and controlgear – Part 4-2: Contactors and motor-starters – AC semiconductor motor controllers and starters.

GB 14048.6-1998: Low-voltage switchgear and controlgear – Part 4-2: Contactors and motor-starters – AC semiconductor motor controllers and starters.

GB 3797-89: Electrical control equipment – Part 2: Electrical control equipment with electronic components.

IEC 61000-4: Electromagnetic compatibility (EMC) – Testing and measurement techniques.

IEC 65: Safety requirements for mains-powered electronic and related equipment for household and similar general use.