DMFC12 110VAC | Dual Mode SCR Firing Circuit | Phase & Burst Control

Description

DMFC12 110VAC Dual Mode Firing Circuit (Phase & Burst Control)

The DMFC12 110VAC Dual Mode Firing Circuit is a versatile, microprocessor-based thyristor firing controller designed for precise industrial power regulation. Configured for 110VAC phase reference operation, this compact DIN rail mounted controller supports both phase-angle and burst-fire firing modes, providing accurate control of resistive and inductive loads across a wide range of industrial applications.

Designed for easy integration into new or existing control systems, the DMFC12 offers exceptional flexibility with multiple analogue and manual input options, adjustable soft-start, current limit functionality, frequency tracking, and phase-loss detection. Its robust design and DIN rail enclosure make it an ideal solution for industrial heating, motor control, lighting regulation, and general power management applications.

Key Features

The DMFC12 110VAC Dual Mode Firing Circuit combines flexible SCR firing control with advanced protection features in a compact DIN rail mounted package.

• 110VAC phase reference version
• Supports both Phase Angle and Burst Fire control modes
• Standard DIN rail mounting enclosure supplied
• Adjustable soft-start (0–30 seconds)
• Current limit function using external CT, Hall-effect sensor or amplified shunt
• Accepts voltage, current and potentiometer control signals
• Compatible with 0–5V, 0–10V, 0–20mA and 4–20mA control inputs
• Manual potentiometer input (1kΩ, 5kΩ or 10kΩ)
• Frequency tracking from 4Hz to 400Hz
• Operates from 24VDC or 18–24VAC supply
• Phase-loss detection for improved system reliability
• Compact industrial DIN rail design
• High-resolution version available

Technical Specifications

• Phase Reference Voltage: 110VAC RMS ±10%
• Alternative Phase Reference Options: 15VAC, 24VAC, 230VAC and 415VAC
• Frequency Tracking: 4Hz to 400Hz
• Power Supply: 18–24VAC or 24VDC
• Power Consumption: 200mA nominal
• Operating Modes: Phase Angle and Burst Fire
• Minimum Signal Span: 0–4VDC
• Maximum Signal Span: 0–25VDC
• Signal Zero Offset: +60% / -40% of span
• Voltage Control Inputs: 0–5VDC or 0–10VDC
• Current Control 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 Adjustment: 0–30 seconds
• Trigger Pulse Voltage: 8VDC open circuit
• Trigger Pulse Rating: 250mA into 10Ω
• Trigger Isolation Voltage: 2500VAC RMS
• Storage Temperature: 0°C to +65°C
• Maximum Operating Temperature: 70°C
• Dimensions (including DIN enclosure): 122mm (D) × 70mm (H) × 56mm (W)

Operation

The DMFC12 provides accurate gate firing pulses for thyristor power controllers using either phase-angle or burst-fire control. Users can select the most appropriate firing mode depending on the application, allowing smooth proportional power regulation or efficient burst switching for heating loads.

The controller accepts multiple analogue control signals, including voltage, current, and manual potentiometer inputs, making integration with PLCs, temperature controllers, and industrial automation systems straightforward. Adjustable soft-start reduces inrush current during start-up, while current limit feedback and phase-loss detection help protect connected equipment and improve overall system reliability.

Frequency tracking between 4Hz and 400Hz enables stable operation across a wide range of AC power systems.

Applications

The DMFC12 110VAC Dual Mode Firing Circuit is ideal for:

• Industrial heater controllers
• Electric heating systems
• Temperature control systems
• Motor speed control
• Lighting power control
• Industrial ovens
• Furnaces
• Drying equipment
• Power regulators
• Industrial automation systems
• SCR power controllers
• Process heating equipment
• OEM control panels

Benefits

• Dual firing modes provide flexible power control
• Simple DIN rail installation reduces panel build time
• Compatible with analogue and manual control signals
• Adjustable soft-start protects connected equipment
• Current limit functionality enhances system protection
• Frequency tracking supports multiple power systems
• Phase-loss detection improves operational reliability
• Compact design saves valuable panel space
• Suitable for both resistive and inductive loads
• Easy integration with PLC and industrial control systems

Safety & Installation

Installation should only be carried out by suitably qualified personnel.

Always isolate all electrical supplies before installation or maintenance. Ensure the correct 110VAC phase reference version is selected for the application. Mount the controller securely onto a standard DIN rail inside a suitable electrical enclosure.

Configure the required firing mode, input signal type, and soft-start settings before commissioning. Fit appropriate external circuit protection in accordance with local electrical regulations and ensure adequate enclosure ventilation. Operate the controller only within the specified environmental limits.