Description

FC36M 415V Three-Phase Dual Mode Thyristor Firing Board

The FC36M 415V Dual Mode Firing Board is a microprocessor-based three-phase thyristor driver designed for precise and reliable SCR (thyristor) control in industrial power control systems. Supporting both phase-angle and burst-fire firing modes, it provides flexible power regulation for resistive and inductive loads across a wide range of industrial applications.

Designed for seamless integration into power control assemblies, the FC36M simplifies installation by eliminating the need for external phasing supply transformers. This 415V AC version features opto-isolated analogue and digital control inputs, adjustable ramp control, over-current protection with latching trip, LED status indication, and an RJ45 communications port for enhanced system integration.

Key Features

The FC36M 415V Dual Mode Firing Board delivers advanced SCR firing control with flexible operating modes, comprehensive protection features, and simple integration into industrial power control equipment.

• 415V AC supply version
• Microprocessor-based three-phase thyristor driver
• Dual operating modes: Phase Angle and Burst Fire
• Switch-selectable phase reversal
• Suitable for resistive and inductive loads
• Analogue and digital opto-isolated control inputs
• Adjustable soft-start ramp (0–30 seconds)
• Current limit and over-current latching protection
• LED status indicators for system monitoring
• RJ45 communications port
• No external phasing supply transformer required

Technical Specifications

• Supply Voltage: 415V AC ±10%
• Frequency: 50/60Hz
• Controller Type: Microprocessor-based three-phase thyristor driver
• Operating Modes: Phase Angle or Burst Fire (switch selectable)
• Primary Fusing: Two HRC F1A ceramic fuses (20 × 5mm)
• Current Consumption: 350mA (full conduction)
• Initial Short-Circuit Gate Current: 500mA
• Sustaining Short-Circuit Gate Current: 250mA
• Initial Pulse Voltage: 9V
• Sustaining Pulse Voltage: 5V
• Pulse Train Frequency: 25kHz
• Voltage Control Inputs: 0–5V DC or 0–10V DC
• Input Resistance: 10kΩ / 20kΩ
• Current Control Input: 4–20mA
• Current Input Resistance: 240Ω
• Opto-Isolated Digital Inputs: 5–24V DC
• Ramp Adjustment: 0–30 seconds
• Current Limit / Over-Current Trip: 0–100mV DC or 0–25V DC
• Load Selection: Resistive or Inductive (SW4 selectable)
• Operating Temperature: 0°C to +65°C
• Storage Temperature: 0°C to +65°C

PCB Dimensions

• PCB Size: 162mm (L) × 108mm (W) × 40mm (H)
• Fixing Holes: 4 × M3.5 clearance holes
• Fixing Centres: 150mm × 62mm

DIN Rail Enclosure

• Dimensions: 166mm (L) × 128mm (W) × 70mm (H)

How It Works

The FC36M firing board generates accurate gate firing pulses for three-phase SCR power controllers. Users can select phase-angle control for smooth proportional power regulation or burst-fire control for efficient switching of resistive heating loads.

Control can be provided using analogue voltage, current loop, or digital opto-isolated inputs. The adjustable ramp function provides a gradual increase in output during start-up, while integrated over-current protection helps protect both the controller and connected equipment.

Selectable load settings allow the board to operate with either resistive or inductive loads, making it suitable for a broad range of industrial applications.

Applications

The FC36M 415V Thyristor Driver is ideal for:

• Industrial power supplies
• Half-controlled rectifiers
• Fully controlled rectifiers
• AC motor control
• DC motor control
• Soft starter systems
• Electric heater controllers
• Induction generators
• AC voltage regulation
• Industrial process heating
• Power conversion equipment
• Manufacturing automation
• SCR power control assemblies

Benefits

• Precise three-phase SCR firing control
• Supports both phase-angle and burst-fire operation
• Simplifies wiring by eliminating external phasing transformers
• Compatible with analogue, digital and 4–20mA control signals
• Adjustable soft-start reduces electrical stress
• Built-in over-current protection enhances system safety
• Suitable for resistive and inductive loads
• Reliable microprocessor-based control
• Easy integration into industrial automation systems
• Available in multiple supply voltage variants

Safety & Installation

• Installation should only be carried out by qualified electrical personnel.
• Disconnect all power before installation or maintenance.
• Ensure the correct 415V supply version is used.
• Configure the firing mode and load type before commissioning.
• Install suitable external protection devices in accordance with local electrical regulations.
• Ensure adequate enclosure ventilation and operate within the specified temperature range.

.X20004 – FC36M User Manual(7)