The Single-Phase 851 Digital
SCR Power Controller

Features & Benefits

The Benefits of Networked Power Control

• Improved management of processing operations through the use of the Single-Phase 851 Digital SCR Power Contoller which provides real-time information.
• Improved productivity through faster startups and reduced downtime.
• Lower installation and wiring costs result from an optional local digital controller replacing panel meters, selector switches and pushbuttons.
• Allows for real-time changes to process and control settings.

Standard Features

Flexibility.
Unlike analog designs, which require a separate control amplifier for each firing mode, the Single-Phase 851 Digital SCR Power Controller allows a single amplifier to operate in any of three modes: Phase-Angle fired; Zero-Crossover fired; and Zero-Crossover fired into a transformer.

On-Board Diagnostics.
Fault memory allows the user to record problems and, through the use of a computer, observe trends that could indicate a need for process modification, troubleshooting or preventive maintenance.

Computerized Setup and Calibration.
Customer-provided computer allows for in-plant adjustments on the processing line. Digital "tuning" of bias and gain eliminates the need to manipulate potentiometers or dials.

Advanced Process and Fault Monitoring.
Allows for real-time readings of voltage, current, power and fault conditions, and for real-time changes to the set point that adjusts power to process requirements. Changes can be made any of three different ways:

• Locally, using a customer-supplied computer.
• Locally, with optional Local Digital Control feature.
• Remotely, with the optional Network Communications feature.

Configurable Analog Input for Control Reference.
Digital controller can be used with a local temperature controller, the output of which can be any industry standard matched to the power controller’s user-configurable analog input.

Operates on Universal Line Voltages.
Each power controller can operate on any line voltage from 24 to 600 VAC and 50/60 Hz.

Touch-Proof Mechanical Design.
This advanced packaging feature prevents unintentional contact with hazardous voltage, allowing for safer service and maintenance.

Optional Features

Network Communications.
Allows for remote control and monitoring of Single-Phase 851 Digital SCR Power Controllers with a PLC or industrial computer through your choice of optional DeviceNetTM, ProfibusTM, ModbusTCP or ModbusRTU network.

Local Digital Control.
User has a 4-digit LED display, 12 independent-status LEDs and 4 push-buttons, which allow local control of the power controller. The user can control unit output and change the desired set point, as well as monitor voltage, current or power on the LED display. Also allows for monitoring of faults for troubleshooting. The local digital display is available mounted directly on the unit (as shown), or it can be shipped loose with a cable connector for mounting on the panel door.

Separate Fuse Kits.
Kit includes fuse holder and a properly sized semiconductor fuse.

Custom Configurations.
Available to meet specific mounting and cooling requirements, packaging and higher than standard ampacity ratings.

For product specifications click here