Brochure

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MOTORS
Marathon
Only
Canopy Cover (ODP and TEFC Motors)
Modification includes installation of a sheet metal drip cover to the motor
for vertical shaft down mounting. Available on rolled steel Drip proof motors
through 256T frame and select TEFC motors. Lead-time is 2 days.
Encoders - MOD22, and MOD24 (Mult. Symbol E3)
These electrical devices sense rotor speed and direction providing feedback
to a control device. An encoder is a feedback device that translates
mechanical motion into an electrical signal. A cable is connected from the
encoder to the variable frequency drive to provide this feedback. Various
mechanical provisions on the motor are required to attach the encoder.
These may include C-Face on the non-drive end of the motor and special
shaft extension. Various resolutions are available. All encoders offered have
quadrature signal with line driver output.
Encoders can be mounted on Black Max® and Blue Max® 2000 Vector Duty
motors, TENV 56 through 286T Frame, TEBC construction in 284T through
449T Frame.
Stub Shaft - MOD42 (Mult. Symbol S4)
Add Stub Shaft to Fan Cooled XRI-SD, XRI-841 (182-449 Frames) to
accommodate addition of encoder on opposite drive end of motor. Lead-
time 2 days.
Fan - MOD43, and MOD44 (Mult. Symbol S4)
Marathon Motors’s XRI® Severe Duty and IEEE841 motors have non-sparking
fans made with, high-temperature, reinforced corrosion resistant plastic
that is impervious to chemical attack and has been specially designed for
motor applications. All motors utilize bi-directional cooling fans.
Oversized fan (Inverter Duty) - See MOD43 Inverter Duty
Fan Removal - MOD44
TEFC to TEAO. Convert a motor from totally enclosed, fan cooled construction
to totally enclosed, air-over by removing fan cover, fan, and cutting off the
fan end shaft. The modified motor must be mounted in the air stream of the
driven fan for cooling purposes. The customer is responsible for providing
adequate airflow over the motor. Lead-time is 2 days.
Vane Axial Fan - MOD43
The modification can be done on rigid or C-Face mount, TEFC, TENV,
EPFC, EPNV, or DP enclosures. Motors will be modified for Vane Axial fan
applications. All motors will get an additional nameplate, and 42” extended
leads. TEFC models will have the fan and fan guard removed and enclosure
changed to TEAO. A minimum airstream velocity of 3000’ per minute is
required.
Lead time is 4 days.
Frequency - MOD7 (Mult. Symbol S4)
Most motors commonly operate on 60 hertz (HZ) within North America.
However, 50 hertz systems are common in other countries.
Frequency Re-Rate 60 HZ to 50 HZ
Marathon Motors’s standard motors rated at 60 HZ may be operated at 50
HZ at reduced voltage and horsepower or Service Factor. A label containing
specific re-rating information will be attached to the motor. Frame size is
subject to change.
Lead-time is 1 day.
Grease/Fittings - MOD0, MOD15 (Mult. Symbol S4)
Standard grease is Exxon Polyrex® EM with a bearing operating temperature
range of -30° to +150°C for ball and roller bearings. Devices for installing
grease into the motors, such as zerk fittings, are available.
Grease Relief Fittings - MOD15
Install standard grease relief fitting on motor. Grease relief fittings serve as
an outlet to equalize pressure in the motor. Not available on explosion proof
motors. Lead-time is 2 days.
Zerk Fittings (Cast Iron Motors) - MOD15
Replace standard grease plugs on motors with zerk fittings. XRI® Severe
Duty and IEEE841 motors come with zerk fittings as standard equipment.
Not available on explosion proof motors. Lead-time is 2 days.
Low Temperature Grease - MOD0
Bearing grease may be changed to allow for a lower operation range. The
motor bearings and end bells are purged and repacked with Beacon 325
grease or equivalent with a grease temperature range of -60°C to +120°C.
Call for lead-time.
High Temperature Grease - MOD0
Bearing grease may be changed to allow for a higher operating range. The
motor bearings and end bells are purged and repacked with Dow Corning
DC44M grease or equivalent with a grease temperature range of -40° to
+204°C. Call for lead-time.
Grounding - MOD20 (Mult. Symbol S4)
All motors 48 to 449T Frame have grounding provisions per NEMA and NEC
Standards. Explosion proof motors are permitted to have a frame ground,
but electrical ground in conduit box must also be connected.
Conduit Box Grounding Lug
Add clamp-type grounding lug in the conduit box.
Lead-time is 2 days.
On-Frame Grounding (Cast Iron Motors)
Addition of drilled and tapped hole on conduit box side of frame with
installation of grounding lug. Available on non-explosion proof cast iron
ratings only. Lead-time is 2 days.
Bearing Current Protection - BCP
BCP is a shaft current mitagationsystem utilizing shaft ground rings for
MODS. They are recommended (NEMA MG1 31.4.4.3) as an effective means
of bearing protection for motors operated from inverter power. One ring is
adequate to bleed down inverter-sourced shaft voltages, thereby protecting
both bearings for motors as large as 5011 frame. BCP may not be installed
on motors used in Division 1 or Division 2 hazardous locations or motors
with a modified shaft. Does not fit all motor types.
Lead-time is 2 days.
Inverter Duty - MOD25, MOD26, and MOD43 (Mult.Symbol S4)
“Inverter Duty” describes a class of motors that are capable of operation
from a variable frequency drive. Many Marathon general purpose motors
are suitable for most variable torque and some limited constant torque
applications.
These motors do not have provisions for mounting encoders, but are
suitable for use with Volts/hertz or open loop vector controls. As required
under Federal law, these motors comply with EPAct efficiencies when
operating from utility power. Lead-time is 2 days.
Marathon
Only
MARATHON ONLY MOTOR MODIFICATIONS