BGB: Siemens-Bonus SWT & Legacy Solutions


Wind Turbine Pitch Control Slip Rings

SWT1.3CS, SWT2.3CS and SWT2.3VS Versions + Legacy Solutions

Issue SIE01 21.05.20 Rev UK 1a

> Approved and Trusted Solutions > Over 25 Years in the Wind Industry

> Development and Supply Partner for Multiple OEM’s > Over 125,000 BGB Slip Ring Solutions Installed Globally

Are you experiencing problems with your Slip Rings?... Cleaning too much? Sticky black residue inside? Waiting on units to arrive? Paying too much for parts?...

Resulting in... CLIMBING towers too much Turbine DOWNTIME Increased dept. COSTS

BGB Upgrade Solutions

Aftermarket innovation : Addresses the failures of the previous units while still fulfilling the Siemens specification Reduce O&M costs : Modular design means that manufacturing costs are lower and parts are common to all versions of the unit Always have the right part : Available in all variants of CS and VS No maintenance : No dust generation or cleaning requirements due to silver fibre technology Work with a trusted technology partner : Incorporates successful design and experience from BGB’s successful Vestas units Improved seal : End access and no maintenance means the concentricity of the cover does not change over time. The weep holes prevent oil ingression into the main body

BGB's improved seal offers greater protection against hydraulic oil ingress from the hydraulic joint

(Pictures left and right show oil ingress in competitor products)

BGB Design Advantages: Signal and Power channels utilise the same brush and ring interface to: reduce unit cost, reduce temperature and increase transmission safety factor

Reduce component lead times : Made in the USA and stocked in the UK

Designed to IP65

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BGB Pitch Control Slip Ring


10 lbs


Silver Fibres

Brush Material:


Data Ring Material:


100M Revolutions

Slip Ring Life:

Did You Know? BGB has included weep holes to allow oil to escape the system prior to having a chance to infiltrate the slip ring (a common problem among electric slip rings mounted to hydraulic unions) .



No Scheduled Maintenance Required



10Amps @ 230V

Power Circuit



Data Lines:

BGB Solutions for Siemens turbines:

Operating Temp: -20 O C to +70 O C

A9B00400458 SWT2.3-VS Pitch Control Slip Ring 10/11 way A9B10051701 SWT2.3-VS Pitch Control Slip Ring 10/11 way A9B10053437 SWT1.3/2.3-CS Pitch Control Slip Ring 8/9 way

OEM Spec 2.85m Exposed





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Did you know?

BGB has been producing slip rings for Bonus turbines since the Bonus 1MW which was first produced in 1996. While having a relatively low production volume, it had the characteristics typical of the Siemens turbines of today, such as the iconic nacelle shape and three stage asynchronous gearboxes that served as a foundation of design for the Siemens Bonus turbines after the Siemens takeover in 2004.

AN Bonus 1.0MW

• Spare part provision

• Legacy support

• Repair and refurbishment

BGB Legacy Products for Siemens / Bonus Turbines Include: AN Bonus 2MWWCT2: Pitch Control Slip Ring 20 way ( 518720 ) , Paratec Upgrade AN Bonus 1MW: Pitch Control Slip Ring 10 way, Paratec Upgrade Lightning Brush Holder & Lightning Brush (32 x 16 x 50)

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AN Bonus 1.3/2.0MW WCT2 Paratec upgrade

• Around this time BGB

supported Bonus in their failure investigation

• Issues addressed with flashing, contamination, and brush degradation

• Upgrade retrofits available

• Wiring diagrams and service information available on request

Lightning brush holder

• BGBs Lightning Protector Brush Holders are robust units that are designed to dissipate lightning energy and thus defend critical components (typically main shaft and yaw bearings) • A low impedance path is created through the rotational interface (hub to

nacelle) from the lightning protection conductor to the ground, therefore protecting the main bearing

PROVIDING ENGINEERING SOLUTIONS SINCE 1976 “To connect, inspire and work closely together so that we are proud of our achievements, community and shared success.”

Phone: +44 (0)1476 576 280



BGB, Dysart Road, Grantham, Lincolnshire. NG31 7NB UK


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