Power Supply

CNC Power Supply Unit – HEIDENHAIN UVR 140D

The UVR 140D is a CNC power supply unit (“CNC Power Supply Unit”) manufactured by HEIDENHAIN, designed to provide the regulated DC voltages required for the operation of HEIDENHAIN CNC control systems. The unit converts the AC mains voltage into one or more stabilised low-voltage DC outputs, powering the control logic, axis boards and peripheral modules of the system. Typically used in HEIDENHAIN TNC series numerical controls from the 1980s and 1990s, including the TNC 150, TNC 155 and contemporary variants.

The power supply unit is the energy core of the CNC system: without stable, regulated voltages the control cannot start up, the axis boards cannot operate and the encoder measurement system loses its reference supply. A power supply failure typically manifests as sudden control shutdown, power error messages or axis position instability, rendering the machine completely unusable until the component is replaced or repaired.

HEIDENHAIN (Johannes Heidenhain GmbH) is a German company founded in 1889 in Traunreut, a world leader in the manufacture of linear and rotary encoders, precision measurement systems and CNC numerical controls for machine tools. Power supply components from the TNC series of the analogue era and early digital systems are today legacy / discontinued: available exclusively as used parts, reconditioned units, or through specialist repair centres.

Main Technical Specifications

CNC Switching Power Supply Unit – HEIDENHAIN 289 133-13

The 289 133-13 is a switching power supply unit for CNC systems (“Power Supply Unit”) manufactured by HEIDENHAIN, designed to power the logic boards, interface modules, and internal peripherals of TNC-series numeric controls (documented on systems such as TNC 155, TNC 360, and related models). The unit generates the regulated DC voltages required for the control electronics: typically +5 V, ±12 V, and +24 V DC. The alternative part number is listed exclusively in the technical specifications table.

The power supply unit is the energy core of the numeric control: it converts mains voltage into stabilised and filtered voltages indispensable for the CPU, axis boards, I/O modules, and encoders. A power supply failure causes an immediate and total machine shutdown — the CNC will not start, communication with the drives ceases, and any active machining operation is abruptly interrupted, risking part rejection and, in some cases, damage to tooling or the worktable.

HEIDENHAIN is a German manufacturer founded in 1948, a world leader in the production of linear and rotary encoders, scale-based measurement systems, and high-precision numeric controls for machine tools. TNC-series controls are widely deployed on milling machines, machining centres, and precision grinding machines. Internal components for older TNC series are legacy / discontinued: available only as used spares, NOS surplus, or through specialist repair services.

Main Technical Specifications