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The OZSCR-2100 is a universal, digitally-controlled SCR control and firing board. It is designed to address numerous SCR power system challenges, allowing fast and economical product development and support. OZSCR-2100 derives its bias power from an external 18V-32 VDC supply.


Configuration and operating parameters can easily be changed in the field using the RS485 Modbus interface and supplied Graphical User Interface (GUI). Systems operating from AC mains voltages up to 1,000 VAC are supported using the integrated, transformer-isolated “picket fence” firing circuitry. Dedicated high-voltage and current measurement interfaces are provided to implement closed-loop digital control of both current and voltage.

The single board OZSCR-2100 has been designed to address numerous SCR power system challenges, allowing fast and economical product development. With the ability to configure every system parameter, implementation possibilities are endless. Pre-designed control algorithms can quickly be selected using a PC-based GUI. A digital PLL synchronizes to the AC line voltage, and can quickly report and respond to abnormal line conditions. Intelligent fault handling minimizes downtime and protects the system from damage. Field updates are fast and easy using the RS485 bootloader. For complex systems requiring control of more than six SCRs multiple OZSCR-2100 boards can easily be combined using the expansion interface.

Key features

  • 100% software configurable over serial port
  • Integrated closed-loop voltage & current feedback
  • 110-1000 VAC, 10-500 Hz line interface
  • Field scalable 0-10V & 0-20 mA control interface
  • Software-selectable direct cathode or low-voltage line synch inputs
  • Software-configurable programmable gain amplifier (PGA) for line sense
  • Software-configurable PGA for DC voltage sense
  • Modbus RTU RS485 digital control interface
  • Digital phase locked loop (PLL)
  • Cathode line synch as well as low-voltage AC line synch inputs
  • Zero cross, phase angle, and burst control modes
  • Soft start/stop, fast inhibit
  • Free Windows configuration GUI
  • Universal input power
  • Direct, Drop-in Replacement for OZSCR-1100

Typical applications

  • Single Phase AC Switch
  • Single Phase Rectifiers
  • Independent AC Switches
  • 3 Phase AC Switch
  • 6 Pulse Rectifier
  • 4 Quadrant Rectifiers


Maximum Ratings

Operating Temperature

-40°C to 85°C

Storage Temperature

-65°C to 85°C

AC Mains Voltage

1,000 VAC

Pulse Transformer HiPot (VAC) - 2 sec


Control Voltage

Universal AC (OZSCR-2000)

100-240 VAC / 47-63 Hz

DC Bias Voltage (OZSCR-2100)

18-32 VDC

Electrical Characteristics

Analog Command Interface

Voltage Input

0-10 VDC

Current Input

0-20 mA

Delay Angle Range

0-180 deg

Phase Reference Angle Bias

0 or 30 deg

Low Voltage Line Sense

+/-10 V

Soft Start Range

1-65,535 deg/sec

Soft Stop Range

1-65,535 deg/sec

Gate Drive

• Initial Short Circuit Gate Current

3.0 A

• Sustaining Gate Current

0.75 A

• Open Circuit Voltage

15 V

• Gate Pulse Width

User Configurable

• PCB Creepage

UL480, VDE0100

Mechanical Specifications

Printed Circuit Board Dimensions

6" x 7.5"

Questions? Get in touch with our team.