SGS™ SHAFT GROUNDING BRUSH & RING SYSTEMS
ONLY PROVEN PRODUCT THAT ELIMINATES ELECTRICALLY INDUCED MOTOR BEARING FAILURE FOR THE LONG-TERM
DP&A Sales/SGS™ Shaft Grounding Systems
United States
ph: (541) 997-4068
fax: (541) 997-7278
sales
Need Technical or Sales Support? Call +1 541-997-4068 or email sales@dpa-sales.com
Overview
SGS™ shaft grounding systems prevent electrically induced bearing damage on variable frequency drive motors. An early pioneer of this industry, DP&A Sales and SGS™ have developed a 30-year scientific and field-tested knowledge base across many industries. This is far greater than any other competitor on the market. Our shaft grounding systems were developed in the pulp and paper industry where long term reliability, performance and maintainability were required.
SGS™ shaft grounding systems have a class leading reputation for being the de facto long-term fix for controlling capacitive discharge that leads to electrically induced motor bearing failure. Our reputation has been built on word of mouth and positive outcomes over several decades. Our customer base is geared towards the end user and heavily reflects those who have tried other grounding systems only to be disappointed when their initial attempts for a fix failed. Our design philosophy always keeps in mind the end user and their needs whether it's controlling maintenance costs, decreasing the risk of production loss or lost comfort due to a downed HVAC system.
We understand that providing a long-term and cost- effective fix for controlling electrically induced bearing damage involves more than just making brush-to-shaft contact. Our well thought out designs and robust non-drive end and drive end (split ring) shaft grounding systems ensure the necessary target shaft voltages are achieved and maintained for the wear life of the brush. SGS™ non-drive end systems offer the unique distinction of being the only effective grounding system that can be maintained (brush change) while the motor is in operation.
Together, the founders of SGS™ and DP&A Sales discovered in the 1980s they had a serious and costly problem with electrically induced bearing damage at the paper mill they worked. Out of practical necessity, they created and brought to market the first and only effective long-term shaft grounding solution for controlling electrically induced bearing damage.
We want to hear from you so that we can help. Please give us a call or send us an e-mail and we'll discuss your particular application.
Non-SGS™Carbon Brush Systems: Leading competitor carbon brush grounding systems have poor wear allowance, are not inherently maintainable and require the motor to be offline to perform maintenance. Their running surfaces are exposed to the environment and quickly lead to poor path of least resistance and consequently electrical discharge through the bearing. It's important to note carbon brushes are the gold standard for creating a path of least resistance away from bearings, however, flawed grounding system designs prevent long-term effective use of a carbon brush-based system. SGS™ patented designs are not prone to these common problems.
Fiber/Filament Technology: Fiber/filament-type grounding systems state to be friction free despite advertising they can run for millions of miles directly on a shaft, can run for 22+ years continuously and can effectively ground without making shaft contact if the fibers lose shaft contact. Our field experience, direct customer feedback and lab tests show those assertions are simply false. These systems are highly prone to environmental contamination and their lack of design robustness make it a poor choice for most environments. Our lab studies show the achievable shaft voltages obtained by using this technology is at best short lived and from the outset does not achieve what we know to be the target voltage threshold for eliminating capacitive discharge through the bearing. In addition, these systems are not maintainable. This technology may somewhat slow down electrical bearing damage, but it does not eliminate the problem. Click here for article describing shaft voltage differences between SGS™ and this type of technology.
Inductive Absorbers: Also known as common mode chokes, this old technology has been rebranded and claims to "clean-up" the power leading to the motor by clipping the voltage spikes and therefore eliminate the shaft voltages leading to electrically induced bearing failure. Our studies from decades ago show inductive absorbers cannot decrease the shaft voltages generated by the VFD's gated process down to the threshold needed to eliminate capacitive discharge through the bearing. If testing shaft voltages with an induction absorber in place, you will likely see a small reduction in shaft voltage readings, however, it's not enough of a reduction to eliminate electrically induced bearing damage. In short, it will slightly slow down the process of electrically induced bearing damage (as with most shaft grounding products), however, it does not eliminate the problem for the long-term.
DP&A Sales/SGS™ Shaft Grounding Systems
United States
ph: (541) 997-4068
fax: (541) 997-7278
sales