2008-276 D - Laserfiche WebLink

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C. Combination Starter Units 1. Combination starters shall include a motor circuit protector (MCP) in series with a motor controller and an overload protective device. The MCP shall have an adjustable magnetic trip range up to 1000 percent of rated continuous current and a trip test feature. MCP's shall be labeled in accordance with U1489. 2. Motor starters: 3 Pole, 600 Volt, shall be electrically operated. Provide NEMA sizes as required for the specific horsepowers. Minimum size shall be NEMA Size I . Fractional size starters are not acceptable. IEC rated starters shall not be acceptable. Starters shall have 120 Volt encapsulated operating coils; individual control power transformers with primary and secondary fuses and silver cadmium oxide renewable line contacts. 3. Multi -speed and reversing starters shall include two motor rated contactors mechanically and electrically interlocked so that only one device may be energized at any time. 4. Reduced voltage starters: Solid state, six SCR, full wave type with adjustable current limit and voltage ramp to control starting torque, automatic load sensing circuit to minimize energy consumption, line and load side surge protection and noise suppression and controlled deceleration adjustment to reduce the effects of surges caused by centrifugal pump loads. Provide heat sinks and ventilation to remove heat from the structure. Each starter shall include a motor horsepower rated isolation contactor to positively disconnect the line voltage when the SCR control is off. Each solid state reduced voltage starter shall include a by-pass full voltage motor starter (FVNR) which shall be capable of operating the motor in an across the line start mode. The FVNR starter shall be controlled independent of the SSRV so that in the event of the SSRV failure the motor will remain operable via the FVNR by-pass starter. The SSRV and the FVNR by-pass shall be completely isolated to allow for servicing and maintenance of either while the other remains operable, provide all necessary contactors, controls, relays, wiring, etc. 5. Wye -delta starters shall be closed circuit transition for use with 6 or 12 lead motors. 6. Contactors: Electrically held, 120 VAC coil operator, suitable for tungsten, ballast, or resistive non -motor loads, with over current protection, control transformer and contact ratings and poles as necessary. 7. Motor overload protection: Standard, 3 Pole, thermal bi-metallic or melting alloy type, with push -to -test feature. Electronic or adjustable overload relays will not be acceptable. Overload relays for submersible pump motors shall be ambient compensated, quick trip, Class 10. Overload relays shall be manually reset from outside the enclosure by means of an insulated pushbutton. Provide auxiliary alarm contacts as necessary. 8. Auxiliary contacts: Form C, NEMA A600 rating, as required by the control schemes. Provide 1 -normally open and 1 normally closed spare contacts on each starter. Additional . auxiliary contacts shall be furnished as required by the control schematic. 9. Control power transformers: Two winding type, 120 VAC secondary, fused in accordance with the NEC. Provide extra capacity as required. 044572017 16480-5