PJM Excels on Noted Trenton Biogas Project

PJM Mechanical Contractors, Inc. is currently finishing up work at Trenton Biogas, a new clean energy facility set to go online in early 2020. As the first large-scale anaerobic biodigester facility of its type in New Jersey, Trenton Biogas is paving the way for the Garden State to take another step in the direction of going green. Each year, the facility has the potential to recycle over 110,000 tons of food waste from local homes and businesses that previously would have been destined for landfills. Through Trenton Biogas’s anaerobic biodigestion process, the waste is utilized to produce up to 29,000 MWh of renewable energy and 23,000 tons of organic compost per year. The project scope inv

Effects of VFD Motor Shaft Voltage and How to Prevent It

Shaft voltage is a phenomenon that commonly occurs in electric motors powered by variable frequency drives. The rapidly-switching voltage pulses of VFDs induce high voltages in shafts and bearings that may overcome insulating properties of bearing grease, and the resulting sparks can cause pitting, fluting, frosting, grooving, and cratering that lead to premature failure of the bearings and motor. Bearing damage due to shaft voltage can develop in as little as one week, and failure can occur within a few months. The damage can also extend to the bearings of other connected equipment such as tachometers and gear boxes. Early symptoms of motor shaft voltage are noise, vibration, darkened greas

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