Project Ten:  This job removed two slip ring motors and antiquated controls from an overhead crane and replaced them with 2 inverter-duty induction motors, interface control relays and new variable frequency drives.

• Replaced two slip ring motors with Elektrim 40 HP motors with custom double ended shaft for mechanical brakes.
• Removed slip ring motor field resistors and associated pull-in speed contactors.
• Removed forward and reverse starters.
• Installed new branch circuit protection in motor control center.
• Installed new panel with two ACS 800 AC Variable Frequency Drives in a NEMA 4 enclosure with cooling fans and ducts into air conditioned equipment room.
• Drives operated in a master-follower mode via ABB fiber optic link
• Installed Finder ice cube relays to interface between the existing PLC and the drives.
• Turnkey installation and startup.

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