SIEB & MEYER 26.39.023.7 Braking Resistor Module

Module Feature

SIEB & MEYER 26.39.023.7 is an external servo braking resistor module. It works with SIEB & MEYER power supply modules and servo power modules. When motor deceleration produces regenerative energy and raises DC bus voltage, this resistor consumes excess energy to suppress bus overvoltage. Built-in overtemperature thermal switch for safety cut-off. Metal housing with heat sink structure, good heat dissipation performance. Compact panel mounting design. Widely used in CNC machine tools, semiconductor processing equipment and multi-axis automation servo systems.

Working principle

When servo motors brake, regenerative power flows back to the shared DC bus and increases bus voltage. Once voltage exceeds threshold, the drive power stage switches current to this brake resistor. Electric energy is converted into heat to limit DC bus voltage within safe range. The thermal contact cuts off the circuit automatically if resistor overheats to prevent fire and component damage.

Onboard components

High power wirewound resistor element, thermal overtemperature switch, metal heat sink, power terminal block, protective housing.

LED indicators

No built-in LED indicators; overtemperature signal is transmitted back to servo drive for fault display.

Hardware self-diagnosis

Visual inspection of resistor housing for discoloration or burn marks; resistance value measurement; thermal switch continuity test; check terminal tightness and wiring insulation integrity.

Programming software

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

Electrical & Process Parameters

Model: 26.39.023.7 Resistance value: High power wirewound resistor Function: DC bus regenerative energy dissipation Signal: Thermal switch feedback Cooling: Forced air / natural convection 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 brake resistor module

System compatibility

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

Function

26.39.023.7 brake resistor module manufactured by SIEB & MEYER. It absorbs regenerative braking energy from servo motors and stabilizes DC bus voltage. Overheating will trigger thermal switch and send fault signal to servo controller. 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, reserve sufficient air circulation space. Connect resistor power wires to the brake terminals of power supply module, wire thermal feedback cable to drive control terminal. Configure brake parameters via SIEB & MEYER commissioning software, test function before formal operation.

Interface

Brake power terminal pair, thermal switch signal terminal of 26.39.023.7.

Diagnostic

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

Product Brief

26.39.023.7 SIEB & MEYER servo braking resistor module,panel mount,used for DC bus regenerative energy dissipation,equipped with thermal protection switch,matching 26 series servo power supply modules,for CNC and semiconductor multi-axis servo drive overvoltage protection.