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Rotating Machines
Specification Guide GFS-V3
LOW AND MEDIUM VOLTAGE AC MOTORS
TEFC SEVERE DUTY AND WPI
VERTICAL HOLLOW SHAFT (VHS)
Energy $aver VHS
Initial Release – 12/2014
Page 1
Rotating Machines
Specification Guide GFS-V3
Table of Contents
1. General Requirements............................................................................................3
2. Electrical Requirements......................................................................................…4
3 Mechanical Requirements......................................................................................6
4. Data................................................................................................………................9
5. Warranty....................................................................................................……..…..9
Initial Release – 12/2014
Page 2
Rotating Machines
Specification Guide GFS-V3
1.
GENERAL REQUIREMENTS
1.1
Purpose
The purpose of this specification is to help motor users specify world class Premium Efficient
Vertical Hollow Shaft High Thrust motors for use in vertical turbine pump or other applications
utilizing a hollow shaft motor mounted by a P Base.
1.2
Scope
This specification covers continuous duty, horizontal, three phase, integral horsepower, totally
enclosed and weather protected I, squirrel cage induction motors in NEMA frame sizes 2135013 for use either directly on the line or on single step PWM adjustable frequency drives on
variable torque loads.
1.3
Service Conditions
Unless otherwise specified, motors conforming to this specification shall be suitable for
operation in accordance with their rating under the following conditions:
a.
b.
c.
d.
1.4
Ambient temperature -4°C to +40°C.
Service Factor 1.15.
Maximum altitude of 1000 meters (3300 feet) above sea level at 40°C ambient
WP-I motors are intended for indoor or outdoor installations that are not considered
severe. TEFC Severe Duty motors are intended for Severe Duty Applications such as
high humidity, chemical laden (corrosive) or salty, non-ocean front, atmospheres.
Standards
NEMA motors shall be in accordance with NEMA standard MG 1, latest revision. Motors shall
also comply with the applicable portions of the National Electric Code and the Canadian
Standards Association (CSA) latest revisions.
Initial Release – 12/2014
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Rotating Machines
Specification Guide GFS-V3
2. ELECTRICAL REQUIREMENTS
2.1
Operating Characteristics
With nameplate voltage and frequency applied, the motor performance shall be as follows:
a. Torque: The locked rotor, breakdown, and pull-up torque shall meet the
requirements of NEMA Design A or B of the latest version of NEMA MG-1.
b. Current: The locked rotor current shall be below the limits for a motor starter of the
appropriate rating of the motor. Motor shall also be capable of 20 second stall at six
times full load current without injury to the motor components.
c. Efficiency: Motors shall have a full load nominal efficiency that meets or exceeds
the NEMA Premium Efficiency requirements. Motor efficiency shall be tested per
IEEE 112 test method B, using accuracy improvements by segregated loss
determination.
d. Temperature Rise: The temperature rise shall be 80C or less at 1.0 service factor.
2.2
Stator and Rotor lamination Steel
The lamination steel used shall be low loss silicon steel with a C5 coating. The stator and rotor
slot designs shall be optimized.
2.3
Insulation System
a. All motors shall use a UL listed Class F system or better. 213-449 frame motors
shall use a trickle treat process to ensure no voids exist in the winding which virtually
eliminates corona. (This process is vastly superior to a dip-and-bake process which
traps air in pockets in the winding and does not penetrate into the stator slots.) 500
frame motors may use a Vacuum Pressure Impregnation (VPI) system.
b. The insulation system shall be designed to meet a minimum resistance of 1.5
megohms after exposure in a humidity chamber at 10% humidity for 168hrs in a 40°
C ambient.
c. All motors shall be tested for partial discharge inception voltage to ensure the motors
exceed NEMA MG1 Part 31.
2.4
Space Heaters
Unless otherwise specified, motors shall have a 115V space heater to prevent condensation
from forming on the windings.
Initial Release – 12/2014
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Rotating Machines
Specification Guide GFS-V3
2. ELECTRICAL REQUIREMENTS - continued
2.5
Thermostats
444-5013 motors shall have 3 class F normally closed trip thermostats wired in series.
2.6
Starting
Single voltage motors shall be suitable for part winding starting.
Initial Release – 12/2014
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Rotating Machines
Specification Guide GFS-V3
3. MECHANICAL REQUIREMENTS
3.1
Stator Frames
a. The horsepower to frame assignments for NEMA Motors shall conform to the latest
revision of NEMA MG 1 standard for horizontal T frame motors.
b. Frames shall be constructed of high strength Class 25 grey iron or better.
c. All frames shall include cast-in lifting lugs unless cast-in lifting lugs are provided on
the end shields. (Lifting lugs provide consistent and reliable lifting provisions.
Eyebolts can be dangerous if not used properly. Cast-in lifting lugs add another
dimension of safety).
3.2
Enclosure
WP-I motors shall have a minimum IP rating of IP22.
TEFC SD motors shall have a minimum IP rating of IP55.
3.3
Bearing System
a. All motors shall have a minimum L10 bearing life of 8760 hours considering the
thrust applied to the motor.
b. All motors shall have a re-greasable bearing system or a refillable bearing system for
oil-lubricated bearings.
c. All machined surfaces of the bearing caps and end shield shall be close running fits.
d. On grease-lubricated bearings, grease entrance and exit cavities shall be precharged with Mobil Polyrex- EM™ premium grease to eliminate potential for
condensation entering the grease cavity.
e. End shields shall be provided with grease fittings and relief plugs extended to the
outer periphery of the end shield to allow for re-greasing in service.
f. The bearing system shall be locked to reduce endplay.
Initial Release – 12/2014
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Rotating Machines
Specification Guide GFS-V3
3. MECHANICAL REQUIREMENTS - continued
3.4
Vibration
Vibration at rated voltage and frequency shall meet NEMA Grade B limits.
3.5
Shaft
The shaft shall be constructed of 1045 carbon steel or better and shall be machined to meet
NEMA or IEC specifications.
3.6
Endshields
a. End shields shall be high strength class 25 grey iron or better.
b. Condensation drains shall be provided in the lowest point of the lower end shield.
c. Lifting lugs shall be provided on the end shields for 320 frame and larger motors.
3.7
External Cooling Fan
All fans on TEFC motors shall be corrosion resistant, non-sparking material such as 30% glass
filled polypropylene.
3.8
Conduit Box
a. The conduit box shall be cast iron or fabricated steel.
b. The box shall have a gasket between the conduit box and the motor frame which
provides lead separation.
c. A gasket shall also be provided between the machined surfaces of the conduit box
and cover to provide a waterproof conduit box.
d. Bolts securing the conduit box cover shall be on the outside of the box cavity.
e. The conduit box shall meet or exceed the volumes as included in IEEE 841 with a
threaded conduit hole.
f. Grounding provision shall be provided in the conduit box.
g. The conduit box shall be able to be rotated in 90-degree increments.
h. The internal temperature of the terminal box shall allow use of 75C rated supply
conductors for motors rated 600V and below and shall allow the use of 90C rated
supply conductors for motors rated above 600V.
3.9
Shaft Grounding Ring
444-5013 frame motors used on a variable frequency drives that are used in a non-hazardous
area shall have a shaft grounding ring.
Initial Release – 12/2014
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Rotating Machines
Specification Guide GFS-V3
3. MECHANICAL REQUIREMENTS (continued)
3.10
Nameplate
a. The nameplate shall be 316 stainless steel.
b. The nameplate shall also include the following information:
Motor Type
Frame Size
Voltage
Full Load Amps
Horsepower (or KW)
Full Load RPM
Phases
Frequency
Time Rating
3.11
Enclosure
Ambient –Max
Insulation Class
KVA Code
NEMA Design
NEMA Nom. Eff
Service Factor
Min Temp of Sup. Wires
Vibration Limit
Motor Weight
Cat # (if applicable)
Bearing DE
Bearing ODE
Power Factor
Max KVAR
IP Rating
Bearing Lubrication
External Hardware
All screws and bolts shall be plated for added corrosion resistance. All bolts shall be flanged
hex head and minimum of grade 5.
Initial Release – 12/2014
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Rotating Machines
Specification Guide GFS-V3
4. DATA
4.1
Tests
Tests shall be performed on each design to assure compliance with NEMA MG 1 and IEEE Std
112 Method B. Each motor shall have a commercial test with results supplied in the motor
conduit box. All motors shall be tested for partial discharge inception voltage to ensure the
motors exceed NEMA MG1 Part 31.
Data packs shall include outline drawing, connection diagram, installation manual, performance
data, and a speed torque current curve.
5. WARRANTY
5.1
Warranty
Motor mechanical components shall have a 24 month operational warranty and a 30 month from
date of shipment warranty, whichever occurs first.
Initial Release – 12/2014
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