SCR Phase-shift Triggers

I. Overview

This control board consists of an integrated trigger circuit, operational amplifiers, pulse transformers and other units produced by Siemens AG, Germany. It can be used together with various automation instruments without interfering with them, and can also be manually controlled via an external potentiometer. It is widely used in control systems where the load requires continuous smooth regulation, where high control accuracy is required, or where high inrush current is not permitted, such as speed control, voltage regulation and charging of AC/DC motors. When in use, conventional thyristors or triacs can be connected. It is mainly used for three-phase purely resistive loads, three-phase inductive loads or primary-side control of three-phase transformers, and can also be used for three-phase full-bridge fully controlled rectification. It features reliable triggering, stable operation and flexible use.

II. Performance features

1. Input power: the power supply and the three-phase synchronizing transformer are integrated into one transformer; input 380VAC±10%, 50Hz
2. Trigger pulses are pulse trains; phase-shift range ≥177 degrees, especially suitable for inductive loads.
3. Output pulse unbalance ≤1 degree; high trigger power, capable of triggering thyristors up to KP1500A.
4. Soft-start function: at power-on, the output voltage gradually reaches the set value (approximately 20S to reach the maximum output), avoiding high inrush current. (The soft-start time can be customized according to customer requirements.)
5. Blocking function: the control board provides event or fault blocking. For example, when the furnace door is opened, the pulses can be blocked so that the SCRs in the main circuit are completely turned off; when blocking is released, the soft-start function is also available.
6. Manual adjustment via a potentiometer (5K-10K) and automatic adjustment connected to the instrument output signal are provided. The automation instrument output signal can be a standard current signal (0-10mA or 4-20mA) or a standard voltage signal (0-5V or 1-5V); switching between different input signals is achieved simply by setting the corresponding jumper according to the markings on the board. If the instrument outputs other signals, please specify when ordering.
7. Dimensions: 167mm (L)×148mm (W)×60mm (H)