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HEIDENHAIN Servo Drive
Brand: HEIDENHAIN -
Code:UM 115D
| Combination name | Availability | Price |
|---|---|---|
Servo Drive Module – HEIDENHAIN UM 115D
The UM 115D is a servo drive module (“Servo Drive Module” / Umrichter) manufactured by HEIDENHAIN, belonging to the modular drive family for linear and rotary axes in CNC machine tools equipped with HEIDENHAIN TNC controls (e.g. TNC 150, TNC 155, TNC 407/410/415). The catalog code is UM 115D (internal identifier UM115D). The prefix “UM” derives from the German Umrichter (inverter / drive); the suffix “D” identifies a specific variant of the series, likely related to the nominal input supply voltage (~115 V AC) or a design revision. The module fits into the backplane or rack of the control cabinet and receives position/speed references from the CNC via the proprietary HEIDENHAIN bus.
The servo drive is the core of the axis control loop: it receives the position and speed setpoint from the CNC unit, closes the current and velocity loop on the servo motor, and ensures each axis performs movements with the micron-level precision required during machining. A drive failure completely disables the corresponding axis — the machine triggers an alarm, the axis stops responding to commands and the machining cycle cannot continue. Timely replacement or repair is therefore essential to restore production.
HEIDENHAIN is a German company founded in 1889 in Traunreut (Bavaria), a world leader in position measurement technology (optical scales, rotary and angle encoders) and CNC controls of the TNC series. The drive product line has been progressively updated; modules of the UM series belong to a legacy / discontinued generation, no longer supplied directly by HEIDENHAIN but still supported by specialist repair centres and available as used/surplus on the secondary market.
Main Technical Specifications
| Type | Servo drive / CNC axis drive module (Servo Drive Module) |
| Part number | UM 115D (UM115D) |
| Brand | HEIDENHAIN (Dr. Johannes Heidenhain GmbH) |
| Known application | CNC machine tools (milling machines, machining centres) with HEIDENHAIN TNC 150 / TNC 155 / TNC 407–415 control |
| Function | Current, speed and position regulation for linear or rotary axis servo motor |
| Nominal input voltage | ~115 V AC |
| Feedback | HEIDENHAIN encoder / linear scale (1 Vpp or TTL signals) |
| Control interfaces | Proprietary HEIDENHAIN bus to TNC unit; encoder connectors; power terminal strips |
| Output current | ~3–15 A |
| Weight | ~1.0–3.0 kg |
| Dimensions | ~150–300 mm × 100–200 mm |
| Production status | Legacy / discontinued — available as used, surplus or through specialist repair only |
