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. It is mainly used for single-phase purely resistive loads, single-phase inductive loads or primary-side control of transformers, and can also be used for single-phase or two-phase full-bridge half-controlled rectification. It features reliable triggering, stable operation and flexible use.

2. Main Technical Specifications

1. Power supply voltage: 220VAC/380VAC
2. Maximum trigger pulse width ≥90 degrees, phase-shift range ≥177 degrees, especially suitable for inductive loads.
3. Unbalance between positive and negative half-cycle pulses ≤1 degree; high trigger power, capable of triggering thyristors up to KP1500A.
4. Soft-start function: soft-start time approx. 20S. (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. Input specifications: manual adjustment via a potentiometer (1K-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: 100mm (L)×83mm (W)×50mm (H)