Description

DMFC12 230VAC Dual Mode Firing Circuit (Phase & Burst Control)

The DMFC12 230VAC Dual Mode Firing Circuit is a compact, DIN rail mounted thyristor (SCR) firing controller designed to provide accurate and reliable power regulation for industrial applications. Configured for 230VAC phase reference, this versatile controller supports both phase-angle and burst-fire firing modes, making it suitable for controlling resistive and inductive loads in heating, motor control, and process automation systems.

Designed for flexibility and ease of integration, the DMFC12 accepts a wide range of analogue control signals, including voltage, current, and potentiometer inputs. Features such as adjustable soft-start, current limit capability, frequency tracking, phase-loss detection, and optically isolated trigger outputs ensure dependable operation while protecting connected equipment. Its compact DIN rail enclosure makes installation simple for OEMs, panel builders, and industrial automation engineers.

Key Features

The DMFC12 230VAC Dual Mode Firing Circuit provides flexible SCR firing control with comprehensive protection features in a compact DIN rail mounted package.

• 230VAC phase reference version
• Supports both Phase Angle and Burst Fire control modes
• Standard DIN rail mounted enclosure
• Current limit function using external CT, Hall-effect sensor or amplified shunt
• Compatible with 0–5V, 0–10V, 0–20mA, 4–20mA and potentiometer inputs
• Frequency tracking from 4Hz to 400Hz
• Operates from 24VDC or 18–24VAC auxiliary supply
• Optically isolated SCR trigger outputs
• Compact and robust industrial design
• High-resolution version available

Technical Specifications

• Phase Reference Voltage: 230VAC RMS ±10%
• Available Phase Reference Voltages: 15VAC, 24VAC, 110VAC, 230VAC and 415VAC
• Frequency Range: 4Hz to 400Hz
• Auxiliary Power Supply: 18–24VAC or 24VDC @ 200mA
• Operating Modes: Phase Angle and Burst Fire
• Minimum Signal Span: 0–4VDC
• Maximum Signal Span: 0–25VDC
• Signal Zero Offset: +60% / -40% of span
• Manual Potentiometer: 1kΩ, 5kΩ or 10kΩ
• Voltage Signal Input Resistance: 5kΩ ±10%
• Current Signal Input Resistance: 250Ω ±10%
• Current Limit Feedback Input: 3–25VDC
• Soft Start: Adjustable from 0–30 seconds
• Thyristor Line Voltage: According to selected model
• Trigger Pulse Voltage: 8VDC open circuit
• Trigger Pulse Current: 250mA into 10Ω
• Trigger Isolation Voltage: 2500VAC RMS
• Storage Temperature: 0°C to +65°C
• Maximum Operating Temperature: 70°C
• Enclosure Dimensions: 122mm (D) × 70mm (H) × 56mm (W)
• Mounting: Standard DIN rail enclosure

Operation

The DMFC12 generates isolated firing pulses for SCR power controllers using either phase-angle or burst-fire operation, allowing accurate proportional power control across a wide range of industrial applications.

The controller accepts analogue voltage, current, or potentiometer control signals and incorporates adjustable soft-start to reduce electrical stress during start-up. Current limit functionality can be implemented using an external current transformer, Hall-effect sensor, or amplified shunt, providing additional protection for connected equipment.

Automatic frequency tracking between 4Hz and 400Hz enables reliable operation across varying supply frequencies, while the optically isolated trigger outputs provide safe and dependable SCR gate control.

Applications

The DMFC12 230VAC Dual Mode Firing Circuit is ideal for:

• Industrial heater controllers
• Electric heating systems
• Furnace control
• Oven control
• Motor speed control
• Lighting control systems
• Industrial process control
• SCR power controllers
• Industrial automation equipment
• Resistive load control
• Inductive load control
• OEM control panels
• Manufacturing equipment

Benefits

• Precise SCR firing using phase-angle or burst-fire control
• DIN rail mounting enables quick and simple installation
• Wide input signal compatibility for flexible integration
• Adjustable soft-start protects equipment during start-up
• Current limiting improves system protection
• Frequency tracking supports variable frequency supplies
• Compact design saves panel space
• Optically isolated trigger outputs improve electrical safety
• Suitable for both resistive and inductive loads
• Reliable industrial performance with minimal maintenance

Safety & Installation

Installation should only be carried out by suitably qualified personnel.

Always isolate all power supplies before installation or maintenance. Ensure the correct 230VAC phase reference version is selected for the application. Mount the controller securely onto a suitable DIN rail inside a ventilated electrical control panel.

Configure the required firing mode, input signal type, and soft-start settings before commissioning. Where current limiting is required, connect an appropriate external current transformer, Hall-effect sensor, or amplified shunt. Install suitable external circuit protection in accordance with local electrical regulations and operate only within the specified temperature limits.