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Standard Features of IEEE
841 Motors (Mill & Chemical)
IEEE 841 Motors are high efficiency totally enclosed fan-cooled (TEFC) or
non-ventilated up to 4160 volts and up to 500 horsepower.
Electrical
- designed to meet NEMA MG-1, MG-13 and IEEE 841
- 90°C rise by resistance method at 1.15 S.F. (or 80°C rise by resistance
method at 1.00 S.F.)
- motors between 2300V and 4160V use VPI form windings that withstand a
surge of 3.5 per unit
voltage at a rise time of 0.1 – 0.2ms and 5 per unit voltage at a rise time
of 1.2ms or longer
- 1.15 Service Factor rating
- rated for ambient temperature from -25°C to +40°C
- 3 Leads c/w solderless lug terminals
- copper cage rotor construction
- NEMA Design B as defined in section 1.17.1.2 of NEMA MG 1-1993
- have a nonhygroscopic, chemical and humidity resistant class F insulation
system
Mechanical
- IP54 rated enclosure
- IP55 rated main conduit box with twice the volume specified in NEMA
- IP55 rated bearing protection (320T frame and larger)
- all ratings are designed for bi-directional rotation
- cast iron frame, brackets, hoods and conduit box
- frame provided with two (2) threaded drain holes c/w drain plugs and
tapped hole on foot for ground
lug
- foot flatness and shaft runout meet or exceed IEEE 841
- automatic corrosion-resistant, replaceable drain plugs
- exterior paint consists of one (1) coat zinc chromate epoxy primer and (1)
coat of dark blue paint
- F-1/F-2 interchangeability
- non-sparking plastic or bronze fan
- noise level not to exceed 90dB "A"
- dynamically balanced rotor designed not to exceed 0.08 inches/second
- regreasable bearings with an AFBMA C3 clearance and they are supplied with
a rust-inhibiting grease which provides a minimum L-10 life of 30,000 hrs
- bearing temperature rise of 50°C for all 2 pole motors and 45°C for all
4 and 6 pole motors
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