HEIDENHAIN UM122 Servo Drive Module

Technical Specifications

Model： UM122, ID.Nr. 325 004-02

Brand： HEIDENHAIN

Product Type: Modular servo inverter unit for HEIDENHAIN CNC machine tool axis drive system

Module Feature:

Function: HEIDENHAIN UM122 modular servo inverter. Receives command signals from CNC controller, converts DC bus voltage into 3-phase AC output to drive synchronous servo motor. Processes encoder feedback signals to implement closed-loop speed and position control for machine linear or rotary axes on heavy horizontal boring mills and large machining centers.

Control Interface: Analog command / serial field bus Power Output: Three-phase AC for servo motor Onboard components: IGBT power module, current sampling circuit, position feedback interface, CPU control board, overvoltage / overcurrent / overtemperature protection circuit

LED indicators: POWER, RUN, ACT, FAULT diagnostic lights

Hardware self-diagnosis: DC bus voltage monitoring, motor current detection, encoder communication check, internal temperature monitoring

Programming software: HEIDENHAIN proprietary diagnostic software for drive parameter setup, gain tuning and fault reading

Electrical Parameters

DC Bus Input: DC link voltage Output: 3-phase AC for servo motor

Mechanical & Structure:

Mounting: Cabinet rack mount Protection class: IP20

Environmental:

Operating temperature: 0℃ ~ +55℃

Ambient humidity: 5~85% non-condensing

Certification: CE

Status: Manufacturer discontinued legacy modular servo inverter

System compatibility

Compatibility description: UM122 belongs to HEIDENHAIN UM1xx servo drive family. Compatible with HEIDENHAIN linear/rotary encoders and synchronous servo motors. Widely deployed on Fives Giddings & Lewis PIC900 heavy CNC boring mills.

Function

Function description: UM122 is modular servo inverter manufactured by HEIDENHAIN. It provides power amplification and closed-loop control for machine feed axis servo motor. The unit reads encoder feedback signals and adjusts motor output in real time according to CNC position command. Multiple protective functions cut off power automatically under abnormal operating conditions to protect motor and mechanical structure. It is legacy axis servo drive spare for heavy CNC boring mills.

Installation

Installation steps: Follow lockout/tagout safety procedure before installation. Cut off DC bus and control power. Install UM122 module into cabinet rack, secure mounting screws. Connect DC bus power cable, motor power cable and encoder feedback cable. Load drive parameters via HEIDENHAIN diagnostic software. Restore power, verify RUN and ACT LED indicators, run drive diagnostic and test axis manual jog.

Interface

Interface list: DC bus power terminal, servo motor power connector, encoder signal connector, control signal terminal block,on-board POWER / RUN / ACT / FAULT LED indicators for HEIDENHAIN UM122 ID 325 004-02.

Diagnostic

Troubleshooting: Axis cannot run: Check DC bus voltage, control power supply or encoder feedback failure. FAULT LED lit: Overcurrent, overvoltage, overheat protection triggered or encoder communication loss. Axis vibration or tracking error: Improper servo gain, motor cable interference or aging power semiconductor components.

Product Brief

Brief description: UM122 ID 325 004-02 is HEIDENHAIN discontinued modular servo inverter,provides three-phase power and closed-loop control for machine feed axis servo motor on heavy CNC boring mills,legacy CNC servo drive spare.