3020 Three Phase Power Controller

This product is no longer available and unable to be repaired.

Product Information

The model 3020 is a two-leg Zero-Cross SCR power controller that linearly controls, proportional to a 4-20 mA command signal, the power applied to a 3 phase electrical load. The controller is available with current ratings from 10 to 70A and voltage ratings from 120 to 575 VAC.

The controller consists of a master and a slave assembly. Each assembly consists of a heatsink and an SCR (Silicon Controlled Rectifier) module containing two SCRs configured to operate as a Zero-Cross AC switch. The SCR module also electrically isolates the line and load voltage from the heatsink and the input command to the SCR module. The master assembly contains a circuit card, powered by the 4-20mA signal, which controls the number of on and off cycles.

The electronic circuit on the master assembly controls the ON/OFF switching of the SCR modules, causing the load power to be directly proportional to the command signal. The fast ON/OFF zero- cross switching improves heater life and provides superior performance over that achieved by relays, contactors, or other solid state time proportional controls.

Some features include:

The control card is powered off of the 4-20mA loop, so no control transformer is required
Compact and economical
Fast cycling distributive control improves heater life and reduces temperature variations
2500 VAC RMS isolation between input/output and line voltage/heatsink
Natural convection

Specifications

Phases	Three phase
Firing Mode	Zero-Cross
Output	AC
Amp Sizes	10A, 20A, 30A, 40A, 70A
Voltage	120V, 240V, 480V, 575V *Other options were previously available upon factory consultation
Control	Analog
Feedback Type	Voltage
Command Signal	4-20 mA standard *Other options were previously available upon factory consultation
Alternate Phases	Previously available in single phase as a 1020 controller