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Braking Modules

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Braking Modules for VFDs and Servo Drives

A braking module (braking unit) is an external electronic device with an IGBT transistor that switches the braking resistor when the DC bus voltage of a variable frequency drive exceeds the threshold. The module is required when the VFD lacks a built-in brake chopper or when higher braking power is needed — typically for drives rated 30 kW and above. Applications include elevators, cranes, centrifuges, winding machines, and servo systems with frequent reversals.

How to Choose a Braking Module

When selecting an external braking module, consider: rated drive power, DC bus voltage, braking duty cycle (ED%), and compatibility with the VFD series. Below is a comparison of models available in our catalog:

ModelDrive PowerVFD SeriesApplication
R912001499up to 30 kWBosch Rexroth Fe/FvConveyors, fans, pumps
R912001500up to 45 kWBosch Rexroth Fe/FvCranes, elevators, centrifuges
R912004611above 45 kWBosch Rexroth EFC/FeHeavy industrial machinery

For correct operation, the module connects to the (+) and (−) terminals of the VFD DC bus, while the braking resistor connects to the module BR+ and BR− outputs. Cable length from VFD to module should not exceed 5 m; module to resistor — up to 10 m.

Braking Module Manufacturers

Our catalog features braking modules from a leading European industrial drive manufacturer:

  • Bosch Rexroth — modules for Fe, Fv, EFC series rated from 30 to 160+ kW. German engineering quality with full Rexroth drive compatibility.

Braking Modules by Specifications

Select braking equipment by parameters:

Warranty & Support

All braking modules come with official manufacturer warranty. We provide technical consultation for selecting the right module for your specific drive and load. Delivery across Ukraine: Kyiv, Kharkiv, Odesa, Dnipro, Lviv — via Nova Poshta or direct shipping. Payment by bank transfer for businesses or cash on delivery.

Frequently Asked Questions

What is a braking module and how does it differ from a braking resistor?

A braking module is an electronic device with an IGBT transistor that switches the braking resistor when the VFD DC bus voltage exceeds the threshold. The resistor only dissipates energy as heat, while the module controls the switching process. A complete braking system requires both components: module + resistor.

When is an external braking module needed for a VFD?

An external module is necessary in three cases: 1) when the VFD lacks a built-in brake chopper — typically models rated 30 kW and above; 2) when higher braking power is needed for high-inertia loads (elevators, cranes, centrifuges); 3) for systems with multiple VFDs connected in parallel to a single module.

How to connect a braking module to a VFD?

The module connects with two wires to the (+) and (−) terminals of the VFD DC bus. The braking resistor connects to the module BR+ and BR− terminals. Observe polarity and use cables of appropriate cross-section. Maximum cable length: VFD to module — 5 m, module to resistor — 10 m.

How to calculate braking module power rating?

Module power is calculated as: P_brake = (load moment of inertia x deceleration speed) / braking time. In practice, select a module with 20-30% margin above the rated drive power. Also consider duty cycle (ED%): cyclic braking at ED 40% requires a more powerful module than ED 10%.

Can one braking module serve multiple VFDs?

Yes, one module can serve multiple VFDs with parallel DC bus connection. The module power must exceed the total braking power of all connected VFDs. This approach is commonly used in multi-axis systems and conveyor lines to reduce costs and simplify design.