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Discuss Hoist Brake Coil Problem in the Industrial Electrician Talk area at ElectriciansForums.net

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Megawatt

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Arms
The hoist brake coil is a 48VDC coil. The original electrical system for the coil involved a transformer (480VAC-48VAC), rectifier, and resistors. The components are no longer manufactured and we are attempting to upgrade to using a stand-alone 48VDC power supply. When the brake coil is activated, the 48VDC output from the power supply drops to 26VDC. The brake coil remain engaged for roughly 5 seconds then disengages. Do we need a larger power supply?
Yes with DC voltage it is terrible about voltage drop. The inrush current on a coil is tremendous and try putting a snubber across the coil. That could be what’s holding your coil in
 

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