OZSCR1100 SCR Firing Board

Note: The OZSCR1100 is obsolete and has been replaced with the OZSCR2100.  The OZSCR2100 is a direct, drop-in replacement, and is 100% compatible with OZSCR1100 applications. 

In addition, the ‘2100 offers several improvements including:

  • S/W Selectable Direct Cathode or Low Voltage Line Synch inputs
  • S/W Configurable Programmable Gain Amplifier (PGA) for Line Sensing
  • S/W Configurable Programmable Gain Amplifier (PGA) for DC Voltage Sensing

The OZSCR1100 is a derivative of Oztek's standard OZSCR1000 digitally controlled SCR firing and control board with the following difference:

  • DC Input Bias Power:  The OZSCR1100 operates off of 18V-32VDC input bias power as opposed to universal AC.


In addition to generating the line synchronized SCR gate drive signals, the OZSCR1100 incorporates advanced features and functions that provide closed loop control options, eliminating the need for external hardware and system complexity.

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 1000VAC 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 OZ SCR1100 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 down time and protects the system from damage.  Field updates are fast and easy using the RS485 boot loader.  For complex systems requiring control of more than six SCRs multiple OZ SCR1100 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 & 0-20mA Control Interface
  • Modbus RTU RS485 Digital Control Interface
  • Digital Phase Locked Loop (PLL)
  • Zero Cross/Phase Angle/Burst Control Modes
  • Soft Start/Stop, Fast Inhibit
  • Free Windows Configuration GUI
  • Cathode Line Synch as well as Low Voltage AC Line Synch Inputs
  • 18-32VDC Input Power

Typical Applications

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