DC Injection Braking

DC injection motor brakes have been designed for integrating into the existing control circuits on machines in the simplest and most cost effective way.

Some of the benefits associated with dc injection motor brake units:
Increase safety in hazardous machines like woodwork machines
Adjustable breaking time and braking current
Reduce stopping times maintenance free
Increase production cycles by reducing stopping time, therefore re-start can be quicker
Easy installation

We provide the DC brakes in 3 versions for all sizes and types of motor which are:

DC injection brake module – IP20 motor brake unit, required to be designed and mounted into a control system either for new machines or retrofit to complex machines. For complex machine systems it is necessary to interlock the braking unit into the existing starting system to prevent both operating at the same time. These can be connected into the system, for process or emergency use.
Starter & brake unit – IP65 unit, replaces DOL or Star delta starter for new or retrofit to simple run/stop machines. These can be connected into the system, for process or emergency use.
Retrofit emergency brake unit – IP65 unit, fits between existing machine supply or isolator and the existing machine starter. The external emergency stop or safety guards are then wired in.

Application:- 6 head planer at timber importer.

DC Motor Braking system that was designed and retrofitted to a woodworking machine. This was designed to interface with the existing control cabinet. And the braking cabinet was mounted on top of the existing cabinet.

- PUWER 98 & Woodworking Machines

On 5th December 1998, the new ‘Provision of Use of Work Equipment Regulation 1998’ was implemented. This was a very important date for the Woodworking Industry.

One of the major changes was the fitting of braking to certain types of machines.

Why do you need to consider fitting braking to your machines?
For new woodworking machinery, the provision of an automatic brake is an Essential Safety Requirement of the Supply of Machinery Regulations as follows

"The machinery must be equipped with an automatic brake that stops the tool, in a sufficiently short time (this has been defined as 10 seconds or less in the CEN Standards), if there is a risk of contact with the tool whilst it runs down."

Although this applies to new machinery the same standard has now been adopted to second hand and existing machinery already in use.

Employers will be required to fit braking on machines to safely reduce the run down time, where the risk assessment shows necessary.

There has also been a deadline set to modify machinery to comply with the regulations. These machines typically include:
Comply by 5th December 2003
Circular saw benches.
Dimension saws.
Powered and hand fed crosscut saws.
Single end & Double end tenoners.
Combination machines.
Comply by 5th December 2005
Narrow band saws.
Vertical spindle moulders.
Hand fed routing machines.
Thicknessing / Planing machines.
Surface planing machines.
Comply by 5th December 2008.
Other woodworking machinery not listed above, which a risk assessment shows braking to be necessary, must comply by 5th December 2008.

The regulations apply to all users of woodworking machinery and these include:
Joinery Companies
Timber suppliers
Furniture manufacturers
Double Glazing companies
Door and Window manufacturers
DIY Warehouses (eg B&Q)
Other wood product manufacturing

The Health and Safety Executive, in the UK, have published a document, which outlines the requirements and most suitable methods of complying with the regulations.

This document is available free of charge from HSE books, information sheet reference WIS38 ‘PUWER98: Retrofitting of braking to woodworking machines’.

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