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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

Servo Drive Module – HEIDENHAIN UM 112D

The UM 112D is an analogue servo drive amplifier module (“Servo Drive Amplifier Module”) manufactured by HEIDENHAIN, documented as a component of HEIDENHAIN CNC systems based on the TNC series controls (TNC 155, TNC 360, TNC 407 and compatible systems). The module receives an analogue speed reference from the numerical control and drives the axis servo motor, closing the position/speed loop via feedback from a HEIDENHAIN encoder. The UM family covers several current-rating variants; the suffix D identifies the specific revision or sub-variant of this module.

The servo drive module is the electronic heart of the axis regulation loop: it amplifies the CNC reference signal and converts electrical power into torque on the servo motor, ensuring precise positioning and controlled motion dynamics. A failure of the module renders the corresponding axis inoperable, halting the machine and requiring immediate replacement to restore production.

HEIDENHAIN is a German company founded in 1889, a world leader in the production of position measurement systems (linear and rotary encoders), numerical controls (TNC series) and drives for precision machine tools. The UM series modules belong to the analogue-generation HEIDENHAIN drives and are today legacy / discontinued: support is only available through used spare parts or specialist repair services.

Main Technical Specifications

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

2-Axis Control Module – HEIDENHAIN UM121B

The UM121B is a 2-axis control module (“2-Axis Control Module”) manufactured by HEIDENHAIN, a component of the modular CNC control systems of the TNC series (typically TNC 155 / TNC 355 and derivatives). The module manages position and velocity loops for two servo axes, processing incremental encoder signals from HEIDENHAIN encoders and generating torque references to the drive power stages. The “B” variant identifies a specific hardware revision; the module plugs into the CNC chassis via a card-edge connector.

The 2-axis module is the core of the CNC position controller: it acquires real-time feedback from the linear or rotary encoders on both assigned axes and closes the control loop, ensuring that the programmed path is followed with the micron-level precision characteristic of HEIDENHAIN systems. In the event of failure the control immediately raises an alarm and locks the two affected axes: no machining is possible until the module is replaced or repaired, making it a strictly critical component for production continuity.

HEIDENHAIN (Dr. Johannes Heidenhain GmbH) is a German precision technology company founded in 1889, a world leader in linear and rotary encoders, glass scale measurement systems, and CNC controls for high-precision machine tools. The TNC series controls are installed on machining centres, milling machines, and grinding machines worldwide. Modules in the UM family are legacy / discontinued: available only as used, surplus, or through specialist repair services.

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PLC Expansion Board – HEIDENHAIN PL 410B

The PL 410B is a PLC expansion board (“PLC Expansion Board”) manufactured by HEIDENHAIN, designed to extend the digital input/output capabilities of TNC-series CNC controls (typically TNC 360, TNC 415, TNC 425 and compatible variants). The board integrates into the control system via ribbon cable or backplane connector and handles bidirectional digital signals between the control and the machine tool’s peripheral devices: limit switches, proximity sensors, actuators and solenoid valves. The “B” suffix identifies a specific hardware revision of the board.

The PLC expansion board is the physical interface between the HEIDENHAIN control’s PLC program and the machine’s real-world devices: it reads the status of inputs (limit switches, sensors, cycle push-buttons) and switches outputs (relays, valves, indicator lights). If the board fails, the CNC control loses its ability to manage machine logic: axes latch in safe-stop, automatic cycles cannot execute, and PLC alarms render the machine completely inoperable until the module is replaced or repaired.

HEIDENHAIN is a German company founded in 1948, a world leader in linear and rotary encoders, measurement systems and CNC controls for precision machine tools. Remaining independent, it is internationally recognised for the reliability and accuracy of its systems. Modules in the PL 410 series belong to a generation of controls that is now legacy / discontinued: availability is limited to the used market and specialist repair.

Main Technical Specifications

PLC I/O Board – HEIDENHAIN PL 300

The PL 300 is a PLC input/output expansion board (“PLC I/O Board”) manufactured by HEIDENHAIN, documented as an expansion module for HEIDENHAIN TNC series CNC control systems (e.g. TNC 360, TNC 415, TNC 425). It manages the interface between the CNC control unit and the machine tool’s peripheral devices: limit switches, sensors, solenoid valves, and actuators. It is not a CPU or a drive, but a dedicated PLC I/O expansion module.

The PLC I/O board is the digital bridge between the CNC control and the machine: it acquires input signals from limit switches, pushbuttons, and process sensors, and generates output commands for solenoid valves, relays, lubrication systems, and automatic tool changers. A failure of this module causes partial or total loss of control over machine peripherals, resulting in immediate production downtime and inability to safely execute automatic machining cycles.

HEIDENHAIN (Dr. Johannes Heidenhain GmbH) is a German company founded in 1948 in Traunreut, Bavaria, specializing in precision measurement systems (linear and rotary encoders, digital readouts) and CNC controls for machine tools (TNC series). Remaining family-owned and independent, it is one of the world’s leading manufacturers in the field. The PL 300 module belongs to a legacy / discontinued product family: available only as used, surplus, or through specialist repair.

Main Technical Specifications

LCD Operator Panel – HEIDENHAIN BF 370

The BF 370 is an LCD operator panel (“LCD Operator Panel”) manufactured by HEIDENHAIN, designed as a human-machine interface unit for TNC series CNC controls (compatible with TNC 410, TNC 415, TNC 426, TNC 430 and related controllers). It integrates a colour TFT display, a keyboard with function keys, configurable softkeys, a numeric keypad, and axis selection keys, connecting to the CNC control unit via the proprietary HEIDENHAIN cable harness. It does not include an autonomous processing unit: it is a display and data-entry terminal dependent on the main controller.

The operator panel is the primary human-machine interface of the CNC machining centre: it displays part programs, machining data, diagnostic messages, and graphical tool-path simulations, allowing the operator to input programs, monitor the machining cycle, and set tool offsets. In the event of failure, the machine becomes completely inaccessible for programming and manual operation, making this component a critical production bottleneck.

HEIDENHAIN (Dr. Johannes Heidenhain GmbH) is a German precision technology company founded in 1889, headquartered in Traunreut, Bavaria, specialising in linear and rotary encoders, measuring systems, and CNC controls for machine tools. The TNC series has been the industry reference standard for high-precision milling and machining centre control for decades. Operator panels of the BF generation are now legacy / discontinued: available only as used, surplus, or through specialist repair services.

Main Technical Specifications

CNC Power Supply Module – HEIDENHAIN 289 133-15

The 289 133-15 is a power supply module (“Power Supply Unit”) manufactured by HEIDENHAIN, installed inside the cabinet of HEIDENHAIN computerised numerical control systems (TNC series). The unit generates and distributes the regulated DC voltages required by the control logic, encoder interfaces, and auxiliary circuits of the CNC. It is not a drive or a CPU board: its sole function is to power the system electronics. No additional accessories are normally included in the standard supply.

The power supply is the energy core of the control system: it converts mains voltage into regulated DC voltages that are indispensable for the CPU, interfaces, servo drives, and CNC peripherals. A power supply failure causes an immediate and complete machine shutdown; without it no axis can be moved and no program can be executed, resulting in total production stoppage.

HEIDENHAIN (Dr. Johannes Heidenhain GmbH) is a German company founded in 1948 in Traunreut, Bavaria, and a world leader in the manufacture of optical linear and rotary encoders, precision measurement systems, and numerical controls for machine tools (TNC series). Its products are synonymous with extremely high precision and reliability in precision machining. Components from older control generations (TNC 155, TNC 360, TNC 407/410/415/425) are legacy / discontinued and available only as used parts, surplus stock, or through specialist repair.

Main Technical Specifications

CNC Electronic Control Board – HEIDENHAIN 238 289 01

The 238 289 01 is an electronic control board (“Electronic Control Board”) manufactured by HEIDENHAIN, a leading German manufacturer of precision measurement and CNC control systems. The component belongs to the internal control electronics family of HEIDENHAIN TNC control systems, designed for signal management and interfacing within the control unit. The part number includes a hardware revision suffix (01) identifying the specific board variant; later revisions may exist. The board is installed in the control’s electronics rack and operates in conjunction with the other cards on the TNC backplane.

HEIDENHAIN TNC internal electronic boards perform essential functions: processing position signals from encoders, managing interpolated axes, interfacing with the power electronics, and handling inter-module communication within the CNC. A failure of this component typically causes a complete or partial control shutdown — unexpected machine stops, loss of position reference, or system errors that make machining impossible until the board is replaced or repaired.

HEIDENHAIN (Dr. Johannes Heidenhain GmbH) is a German company founded in 1948 in Traunreut, Bavaria, specialising in position measurement systems (linear and rotary encoders, optical scales), TNC numerical controls, and precision instrumentation for machine tools. Unlike many competitors, HEIDENHAIN has remained independent and is still active; however, boards in the 238 xxx series belong to control generations that are now legacy / discontinued and are available only as used stock, NOS surplus, or through specialist repair services.

Main Technical Specifications

CNC Control Electronic Board – HEIDENHAIN 237 930 01

The 237 930 01 is a CNC control electronic board (“CNC Control Board”) manufactured by HEIDENHAIN, belonging to the component family for TNC numerical control systems in the legacy series. It is designed to operate inside the control cabinet of CNC milling machining centres or equivalent systems equipped with a HEIDENHAIN control. It performs processing, interface, or axis management functions depending on the system in which it is installed; the specific function must be verified in the technical documentation of the reference machine. The component belongs to the historical HEIDENHAIN production line, with no officially documented revisions or variants on the secondary market.

Electronic boards in HEIDENHAIN CNC systems form the processing and interface core of the numerical control: they manage communication between the computing unit, servo drives, position encoders, and operator interface. A failure on this board results in an immediate machine halt, positioning errors, loss of communication with the axes, or inability to start the machining cycle — production downtime that cannot be recovered without replacement or repair of the component.

HEIDENHAIN (Dr. Johannes Heidenhain GmbH) is a German company founded in 1889, a world leader in the production of position measurement systems — linear, rotary and angle encoders — and TNC series CNC numerical controls, used primarily on milling machines, machining centres, and high-precision grinding machines. Products from the TNC 2500 generation and contemporary series are legacy / discontinued: available exclusively as used components, NOS (New Old Stock), or through specialist repair.

Main Technical Specifications

Power Supply Unit for CNC Control – HEIDENHAIN 236 484 10

The 236 484 10 is a multi-rail switching power supply unit for CNC control systems (“Power Supply Unit”) manufactured by HEIDENHAIN (Dr. Johannes Heidenhain GmbH, Traunreut, Germany). The module converts mains voltage into stabilised multi-rail DC output (±15 V, +5 V, +24 V typical), distributed to logic boards, encoder interfaces and I/O modules inside the control unit. The part is documented as a component of HEIDENHAIN TNC-series analogue–digital CNC controls (typically TNC 155, TNC 360 and derivatives) and coeval measuring systems and digital readouts. The product belongs to the power supply line from the 1980s–1990s generation; no publicly documented revision variants are known.

The power supply is the energy core of the CNC control: without stable, noise-free supply voltages no logic board, encoder interface or I/O module can operate correctly. A power supply failure typically manifests as a complete control lockout, undiagnosable system errors, spontaneous resets or corrupted measurement data. Replacement with a genuine HEIDENHAIN module is the only intervention that guarantees full restoration of machine functionality.

HEIDENHAIN (Dr. Johannes Heidenhain GmbH) is a German company founded in 1948 in Traunreut (Bavaria), a world leader in precision measurement systems (linear encoders, rotary encoders, optical measuring scales) and TNC-series CNC controls, the de facto standard for precision milling and grinding. All products belonging to this generation are legacy / discontinued: no longer available new from the manufacturer and sourced exclusively as used stock, NOS (new old stock) or through specialist repair services.

Main Technical Specifications

Power Supply Unit for CNC Control Systems – HEIDENHAIN 236 484 02

The 236 484 02 is a power supply module for CNC control and position display systems (“Power Supply Unit”) manufactured by HEIDENHAIN, documented as a power supply component for units in the TNC (numerical control) and/or ND (position display) product range. The module converts and regulates the mains voltage, providing the stabilised DC voltages required by the control electronics, encoder modules and logic boards of the system. The suffix -02 identifies the revision or output configuration variant relative to the base article.

The power supply is the critical component that ensures the stability and quality of the electrical energy distributed to all subsystems of the CNC control: from processing logic to encoder and motor interfaces. A power supply failure causes the immediate shutdown of the control unit, resulting in total machine downtime; unregulated or noisy voltages can cause encoder reading errors, loss of position and damage to sensitive downstream circuits.

HEIDENHAIN (“Dr. Johannes Heidenhain GmbH”) is a German company founded in 1948 in Traunreut (Bavaria), a world leader in the manufacture of high-precision linear and rotary encoders, optical scales, TNC-series CNC numerical controls and industrial measurement systems. Still an independent, active company, HEIDENHAIN products are fitted on leading machine tool builders (Hermle, DMG Mori, Deckel Maho, Mikron, etc.). Components belonging to the older TNC and ND series are legacy / discontinued: available only as used, surplus or through specialist repair.

Main Technical Specifications