FEATURES:, 500 HP, 900 RPM, 2300/4160 Volts @ 60 Hz, 5810B Frame, 93.6 % Full Load Efficiency, 82.5 % Full Load Power Factor, 121 A Full Load Amperage , 100 – 1250 HP , 3600, 1800, 1200, 900 RPM Normally in Stock. Slower Speeds Available on Special Order. , Weather Protected Type I Enclosure (IP23 rating) , Energy Efficiency Design , Factory New with Manufacturer’s Warranty , 60 Hz, 2300/ 4160V , Standard with 120V Space Heaters Terminated in Separate Auxiliary Box , Standard with 100 Ohm Platinum Stator RTDs, 2 per Phase, Terminated in Separate Auxiliary Box , 1.15 Service Factor – Continuous (1.0 when operated with a VFD) , Class F Insulation with VPI Treatment of Solventless Epoxy Varnish , Class B Temperature Rise , NEMA Design B Torques , Oversized Fabricated Steel Main Conduit Box Rotatable in 90 Degree Increments – Fully Gasketed with NPT Threaded Entrances – F1 Mounted. , Bi-Directional Rotation Except 2 Pole Motors, 5000 Frame and Larger, which are Unidirectional CCW Facing the Drive-End. Call for details if CW Rotation is Required. , Cast Iron Frame and End Brackets , 1045 Carbon Steel Shaft , Copper/ Copper Alloy Rotor Construction for Frames 5800 – 6800. Aluminum Die-Cast Rotor Construction for All Others , Paint System: Phenolic Rust Proof Base Plus Polyurethane Top Coat , Paint Color: Dark Gray – Munsell 7.5BG 4/2 , Vacuum De-Gassed Re-greasable Ball Bearings Using Polyrex EM Grease , Insulated Non-Drive End Bearing on 3600 RPM Motors, 600 HP and Larger , Labyrinth Type Metal Grease Flinger on Both Ends , Cast Iron Inner and Outer Bearing Caps , Grounding Terminal Inside Main Box and on Motor Foot , Stainless Steel Nameplate , Suitable for Use on a VFD – Notes (3), (4), (5), & (6) , 6 Leads , Motors are CSA Approved , Precautions should be taken to eliminate or reduce shaft currents that may be imposed on the motor by the VFD as stated per NEMA MG1, Part 22.214.171.124.