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HEIDENHAIN Servo Drive
Brand: HEIDENHAIN -
Code:UM 111
| Combination name | Availability | Price |
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Servo Drive Module – HEIDENHAIN UM 111
The UM 111 is a servo drive module (“Servo Drive Module” / Vorschubumrichter) manufactured by HEIDENHAIN, documented as a feed axis drive component for milling machines and machining centres equipped with HEIDENHAIN TNC CNC controls (series TNC 145, TNC 155, TNC 360 and related generations). The module manages the current and speed regulation loops of the DC servo motor, interfacing with the CNC unit via the speed reference bus. It is not a CPU board or I/O module, but a dedicated drive for linear axis control.
The UM 111 is the electronic drive that closes the current and speed loop on the feed axis servo motor: it receives the speed reference from the HEIDENHAIN TNC controller and supplies the motor with precisely controlled current, ensuring accurate positioning and interpolation. In the event of failure, the CNC triggers an axis alarm and the machine stops completely; without this module no programmed feed motion is possible.
HEIDENHAIN (Dr. Johannes Heidenhain GmbH) is a German precision technology manufacturer founded in 1889, headquartered in Traunreut, Bavaria, specialising in linear and rotary encoders, CNC controls (TNC series) and drive systems. The company remains independent and active. Products in the UM series are legacy / discontinued components associated with TNC control generations of the 1980s–1990s, available exclusively as used, surplus, or through specialist repair.
Main Technical Specifications
| Type | DC servo axis drive module (Vorschubumrichter) |
| Part number | UM 111 (UM111) |
| Brand | HEIDENHAIN (Dr. Johannes Heidenhain GmbH) |
| Known application | Milling machines and machining centres with HEIDENHAIN TNC control (TNC 145, TNC 155, TNC 360 and related series) |
| Function | Current and speed regulation of DC servo axis motor; feed axis closed-loop control |
| Power supply | ~200–240 V AC three-phase |
| Reference input | Analogue speed reference ±10 V DC (typical TNC systems) |
| Feedback | Encoder / tachogenerator signal from axis servo motor |
| Interfaces / connectors | Multi-pin connectors on CNC bus; motor power terminal strip |
| Weight | ~1.5–4.0 kg |
| Dimensions | ~150–350 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |
