Description

DMFC12 415VAC Dual Mode Firing Circuit (Phase & Burst Control)

The DMFC12 415VAC Dual Mode Firing Circuit is a versatile DIN rail mounted thyristor firing controller designed for precise industrial power regulation. Supporting both phase-angle and burst-fire firing modes, it provides accurate SCR (Silicon Controlled Rectifier) control for resistive and inductive loads across a wide range of industrial heating, motor control, and power management applications.

Configured for 415VAC phase reference operation, the DMFC12 accepts multiple analogue input signals, including voltage, current, and potentiometer control, making integration with PLCs, temperature controllers, and industrial automation systems straightforward. With adjustable soft-start, current limiting, phase-loss detection, and frequency tracking, the DMFC12 delivers reliable, flexible, and efficient power control in a compact DIN rail enclosure.

Key Features

The DMFC12 415VAC Dual Mode Firing Circuit combines flexible SCR firing control with advanced protection features in a compact DIN rail mounted package.

• 415VAC phase reference version
• Supports both Phase Angle and Burst Fire control modes
• Standard DIN rail mounting enclosure
• Adjustable soft-start (0–30 seconds)
• Current limit function using external CT, Hall-effect sensor or amplified shunt
• Accepts voltage, current or potentiometer control signals
• Compatible with 0–5V, 0–10V, 0–20mA and 4–20mA inputs
• Frequency tracking from 4Hz to 400Hz
• Operates from 18–24VAC or 24VDC auxiliary supply
• High-resolution version available
• Compact industrial design for simple installation
• Suitable for resistive and inductive load control

Technical Specifications

• Phase Reference Voltage: 415VAC RMS ±10%
• Other Available Phase Reference Voltages: 230VAC, 110VAC, 24VAC, 15VAC
• Frequency Tracking: 4Hz to 400Hz
• Auxiliary Power Supply: 18–24VAC or 24VDC
• Power Consumption: 200mA nominal
• Controller Type: Dual Mode SCR Firing Circuit
• Operating Modes: Phase Angle or Burst Fire
• Minimum Signal Span: 0–4VDC
• Maximum Signal Span: 0–25VDC
• Signal Offset: +60% / -40% of span
• Voltage Inputs: 0–5VDC or 0–10VDC
• Current Inputs: 0–20mA or 4–20mA
• Manual Control: 1kΩ, 5kΩ or 10kΩ potentiometer
• Voltage Input Resistance: 5kΩ ±10%
• Current Input Resistance: 250Ω ±10%
• Current Limit Feedback Input: 3–25VDC
• Soft Start: Adjustable from 0–30 seconds
• 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 trigger pulses for SCR power controllers, allowing users to select either phase-angle control for smooth proportional power regulation or burst-fire control for efficient switching of resistive heating loads.

The controller accepts multiple analogue input formats, including voltage, current, and potentiometer signals, allowing seamless integration with PLCs, temperature controllers, and industrial automation systems. Adjustable soft-start gradually increases output during start-up, reducing electrical stress, while the current limit input enables external current monitoring and protection using a current transformer, Hall-effect sensor, or amplified shunt.

Frequency tracking between 4Hz and 400Hz ensures stable operation across a broad range of supply frequencies, making the DMFC12 suitable for demanding industrial environments.

Applications

The DMFC12 415VAC Dual Mode Firing Circuit is ideal for:

• Industrial heater controllers
• Electric furnace control
• Oven heating systems
• Motor speed control
• Industrial lighting control
• SCR power controllers
• Temperature control systems
• Industrial process control
• Resistive heating applications
• Inductive load control
• Industrial automation equipment
• OEM control panels

Benefits

• Precise SCR firing for accurate power control
• Supports both phase-angle and burst-fire operation
• DIN rail mounting enables quick installation
• Compatible with multiple industrial control signal formats
• Adjustable soft-start reduces equipment stress
• Current limit capability improves system protection
• Frequency tracking supports a wide range of applications
• Suitable for both resistive and inductive loads
• Compact design saves valuable panel space
• Reliable industrial performance for long service life

Safety & Installation

Installation should only be carried out by suitably qualified personnel.

Always isolate all power supplies before installation or maintenance. Ensure the correct 415VAC phase reference version is selected for the intended application. Mount the controller securely onto a suitable DIN rail within an 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 device, or amplified shunt. Ensure adequate enclosure ventilation and operate the controller within the specified temperature limits.