SIEB & MEYER 26.39.058.2 Braking Resistor Module

Module Feature

SIEB & MEYER 26.39.058.7 is a panel-mounted high power servo braking resistor module. It matches SIEB & MEYER rack servo power supply and power modules. When servo motors decelerate, regenerative energy charges the DC bus; this resistor converts surplus electrical energy into heat to limit DC bus overvoltage. Built-in thermal overtemperature switch for safety interlock signal output. Heavy-duty metal housing with dedicated heat sink for thermal dissipation. Good vibration resistance, suitable for dynamic high-cycle motion axes. Widely used in CNC machine tools, semiconductor processing equipment and multi-axis automation servo systems.

Working principle

During motor deceleration, regenerative energy flows back to the DC bus and raises bus voltage. When voltage exceeds preset threshold, drive power stage activates the brake circuit and current flows through this resistor. Electric energy is converted into heat to keep DC bus voltage within safe operating range. If resistor temperature exceeds safety limit, integrated thermal contact opens and sends fault feedback to servo controller for protection.

Onboard components

High power non-inductive wirewound resistor element, overtemperature thermal switch, metal heat sink assembly, power terminal block, protective metal housing, strain relief structure.

LED indicators

No onboard LED indicators; fault signal is transmitted to servo drive for alarm display.

Hardware self-diagnosis

Visual inspection of housing for discoloration, burn marks and jacket damage; measure resistor ohmic value; continuity test of thermal switch; check terminal tightness and wiring insulation integrity.

Programming software

SIEB & MEYER commissioning software for brake parameter setup and thermal fault monitoring.

Electrical & Process Parameters

Model: 26.39.058.2 Resistor type: High power wirewound braking resistor Function: DC bus regenerative energy dissipation Feedback: Overtemperature thermal switch signal Cooling: Natural convection / forced air cooling Protection: Overtemperature thermal cut-off protection Mounting: Panel mounting

Mechanical & Structure

Mounting: Panel mounting Protection class: IP20

Environmental

Operating temperature: 0℃ ~ +70℃ Ambient humidity: 5~95% non-condensing Certification: CE compliant Status: SIEB & MEYER servo braking resistor module

System compatibility

Compatible with SIEB & MEYER 26 series rack power supply modules and servo power modules, used for multi-axis servo rack DC bus overvoltage protection.

Function

26.39.058.2 brake resistor module manufactured by SIEB & MEYER. It absorbs regenerative braking energy generated by servo motors and stabilizes DC bus voltage. Continuous heavy braking, poor ventilation or resistor aging will trigger overtemperature fault and safety interlock. It is essential safety component for high dynamic servo motion systems.

Installation

Follow lockout/tagout safety procedure before installation. Cut off all rack power completely. Mount resistor module on cabinet wall and reserve sufficient air circulation space. Connect power wires to brake terminals of power supply unit, wire thermal feedback cable to control terminal. Configure brake parameters via SIEB & MEYER commissioning software and test function before system trial run.

Interface

Brake power terminal pair, thermal switch signal terminal of 26.39.058.2.

Diagnostic

Drive overvoltage alarm: Resistor open circuit, loose wiring or mismatched resistance value. Overtemperature fault: Insufficient ventilation, continuous heavy braking or resistor aging. Resistor burn: Excessive regenerative energy or short circuit in wiring. Intermittent overvoltage alarm: Poor terminal contact or loose cable.

Product Brief

26.39.058.2 SIEB & MEYER high power servo braking resistor module,panel mount,absorbs motor regenerative braking energy,built-in thermal protection switch,matching 26 series rack servo power supply modules,for CNC and semiconductor multi-axis servo DC bus overvoltage protection.