Bottom line
What this comparison can establish
Treat HDS03 and HDS04 as different controller selections. Verify the complete label and configured system before considering repair, exchange or replacement.
DIAX04 comparison / configured controller
HDS03 vs HDS04 DIAX04 Drive Controllers
HDS03 and HDS04 belong to the DIAX04 HDS platform, but they are different controller sizes and configurations. A useful comparison preserves the complete basic-unit code, command communication, function ID/version, firmware and the surrounding power system.
Side-by-side identity
What each product label must tell you
HDS03
Browse products →- Role
- DIAX04 HDS controller group with multiple current and configured-function records.
- Verify
- Design, cooling, rated-current code, command communication, function ID/version and firmware.
- Do not assume
- A bare HDS03 base-unit match may omit the configured hardware or software required by the machine.
HDS04
Browse products →- Role
- A separate HDS controller size within the DIAX04 architecture.
- Verify
- Full HDS04 designation, command option, function fields, firmware, motor and supply context.
- Do not assume
- Physical system relationship does not mean HDS03 and HDS04 are direct substitutes.
Decision path
Turn the cabinet into a useful evidence set
Is the request for a base unit or configured drive?
Capture: Photograph every line on the front and side labels plus installed hardware.
Then: List what must remain with the controller during evaluation or exchange.
What is the command and feedback path?
Capture: Record communication and feedback modules, connector labels and cables.
Then: Compare the complete control path before selecting inventory.
What powers the axis?
Capture: Identify the HVE/HVR supply, connected motor and adjacent drives.
Then: Review the HDS unit as part of the DIAX04 cabinet.
Official manufacturer records
Use the edition that matches the installed hardware.
Verified downloads open on the manufacturer’s site. Other references open a library entry with assistance options. Confirm the applicable edition, physical nameplate and machine documentation.
R911320338Rexroth DIAX04 HDD and HDS Drive Controllers, 2nd Generation — Commissioning Manual
Factory documentation for HDS ratings, modules, connection points, installation and second-generation hardware.
View document reference →R911275432DIAX04 HVE and HVR Power Supply UnitsReference for HVE and HVR supply architecture, dimensions, mains connection and DC-bus control.
View document reference →Common questions
Before you request a configured match
Are HDS03 and HDS04 interchangeable?
Not on family names alone. Controller size, current, command, function, firmware and system context must all be checked.
Why record the HVE or HVR supply?
The supply and DC-bus architecture are part of the DIAX04 system in which the HDS controller operates.
Can the firmware be moved?
That depends on the exact hardware and documented service plan. Preserve all firmware and function labels before moving anything.
Availability · repair · exchange
Send the complete code.
The suffix can change electrical and mechanical compatibility. Include every character and a clear nameplate photo.