Model Definition

Technical Specifications

• Board Type: 18D plug-in PCB with faceplate, edge connector

• Faceplate Controls: 7 rotary potentiometers (Current Limit, Current Gain, Volt Off, Accelerate, Decelerate, Stabe, FB Comp); 1 Volt Gain pot; 1 red “F. Min.” LED

• Components: 19 ICs, metal film/carbon resistors, ceramic/polyester capacitors, transistors, improved surge protection

• Compatibility: Reliance MaxPak / AutoMax DC drives (direct replacement for 0-52855)

• Weight: Approx. 0.29 kg

• Status: Discontinued by OEM; NOS / refurbished / used only

Interfaces & Communication

• Edge Connector: Connects to drive rack backplane for power and analog control signals

• Control I/O: Hardwired analog signals; user-adjustable pots interface directly to drive control circuits

• Isolation: Galvanic isolation between user controls and high-power drive sections

• Fieldbus: None; all tuning via analog dials

Key Features

• Enhanced revision of 0-52855 with tighter tolerance components

• Precise, repeatable adjustment of current/voltage loops and accel/decel ramps

• “F. Min.” LED for fault indication (field current minimum)

• Improved noise immunity and stability in closed-loop operation

• Direct drop-in replacement for 0-52855 (CVCA) in existing racks

Application

• Reliance MaxPak / AutoMax series DC drives

• Industrial DC motor control (extruders, cranes, conveyors, rolling mills)

• Legacy drive system maintenance, tuning, and upgrade

• Works with 0-52850 (IRFA), 0-52853 (ISCA), 0-52854-2 (VCTC) in the same drive rack