Description
The Reliance Electric 57652 (often written as 0‑57652‑D) is an AutoMax Universal Drive Controller (UDC) module used to interface an AutoMax PLC system with one or more variable‑speed drives. It plugs into an AutoMax rack and provides the logic, communication, and coordination needed for precise speed and torque control of connected AC or DC drives.
Product description and parameters
The 57652 Universal Drive Controller is a printed‑circuit plug‑in module designed specifically for the AutoMax platform:
- Product type
Universal Drive Controller (UDC) module for AutoMax PLC/drive systems. - Function
- Coordinates the AutoMax processor with Reliance (and compatible) drives.
- Handles high‑speed setpoint updates, feedback processing, and drive status monitoring.
- Supports closed‑loop control strategies such as speed and torque control, depending on the connected drive.
- Form factor
- AutoMax rack card, approximately 3 × 19 × 34.2 cm in size and roughly 0.74 kg weight (typical for this series).
- Rear edge connector for the Multibus‑style AutoMax backplane.
- Front panel with status LEDs, possibly configuration switches, and field/drive connectors (depending on exact revision).
- Power and backplane interface
- Powered from the AutoMax backplane; no separate external logic supply required.
- Communicates with AutoMax processor modules over the standard rack bus, receiving commands and sending status and diagnostics.
- I/O characteristics (typical for this kind of UDC)
- Command outputs to the drive (analog reference, digital enable/run, direction, etc.) via dedicated terminals or cables.
- Feedback inputs from the drive (speed feedback, status bits, fault signals).
- Configuration options for scaling and filtering of analog signals.
Because “Universal Drive Controller” is the family name, different firmware or configuration sets can adapt one hardware type to a range of drive models.

RELIANCE 57652 0-57652-D
Datasheet‑style overview
A datasheet for 57652 / 0‑57652‑D normally includes:
- Electrical
- Backplane voltage and current draw.
- Input signal levels (e.g., digital I/O voltage levels and analog ranges, often 0–10 V or ±10 V for speed reference).
- Isolation and grounding recommendations between logic, drive, and field wiring.
- Performance
- Internal control update rate (scan time for drive interface).
- Resolution and accuracy of any analog channels.
- Timing characteristics for digital command outputs and status input response.
- Environmental
- Operating temperature range suitable for control cabinets.
- Storage temperature and humidity limits.
- Vibration and shock ratings consistent with industrial environments.
- Mechanical
- Card dimensions, slot requirements, and keying so it can only be inserted in compatible positions.
- Front‑panel layout showing LEDs and connectors.
The “extended memory” note sometimes seen with this part number indicates that this particular version has enough memory to handle more complex or multiple drive configurations compared to earlier or smaller UDC variants.
Origin
The 57652 Universal Drive Controller was developed under the Reliance Electric brand as part of the AutoMax PLC and drive ecosystem. Reliance Electric was a major North‑American manufacturer of industrial drives and control systems; these modules were built as industrial‑grade components for use in plant‑floor control cabinets around the world.
Recommended related Reliance Electric models
If you are using or considering the 57652 Universal Drive Controller, other closely related Reliance Electric AutoMax products include:
- Other Universal Drive Controller variants (e.g. 57652‑A or earlier 0‑576xx UDC modules)
Used when different memory sizes, firmware versions, or specific drive families are required, but the same AutoMax approach is desired. - AutoMax processor modules (57C4xx series)
These are the main CPUs that run the control logic and send commands to the 57652 module. Updating to a higher‑performance processor can increase system capability while reusing the same drive controller. - AutoMax I/O modules (digital and analog 57C‑series)
Used alongside the 57652 to bring in field signals (start/stop commands, interlocks, process feedback) and drive additional actuators that coordinate with the drives. - Network communications modules (57C404/57C404C)
Provide AutoMax/DCS networking so multiple racks, each with their own drive controllers like the 57652, can exchange data and be supervised from a central operator station.
These modules together form a complete Reliance Electric AutoMax drive‑based control system: the processor executes the control strategy, the 57652 UDC interfaces to the drives, the I/O modules handle field devices, and the communication modules link everything across the plant.

