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MOTORS
Marathon
Only
Altitude/Ambient - MOD7 (Mult. Symbol S4)
The rating of standard motors assumes operation at sea level. Listed motors
are suitable for operation at altitudes up to 3,300 feet in a maximum ambient
temperature of 40°C. The ambient temperature is the temperature of the
cooling medium surrounding the motor. All standard motors are suitable for
operation over the range of -15°C to 40°C ambient per NEMA MG-1.
AC Motor Altitude or Ambient Re-Rating
Re-rating of a non-explosion proof motor can be done by evaluating the
performance data and possibly changing the Service Factor. Contact Marathon
Motors for motor capabilities prior to motor selection and modification.
Bearings - MOD18 (Mult. Symbol S4)
Most standard motors use anti-friction deep groove Conrad type Ball bearing
, sized for the loads to be expected in industrial applications. Roller bearings
are used on the drive end to handle heavy or overhung (radial) shaft
loads.
Ball to Roller Bearing
Roller bearings have the capability to handle higher radial loads than
Ball bearings, but must have minimum radial loads to operate
correctly. Roller bearings must only be used on belted loads. They are
not suitable for direct-coupled loads. (Marathon Motors recommends
that belting data is reviewed by Engineering prior to converting any
motor to roller bearing.) This option includes replacing only the standard
drive end bearing with a roller bearing and locking the opposite
bearing axially. Available on TEFC Blue Chip
®
and Blue Chip
®
XRI
®
motors.
Lead-time is 3 days.
Roller to Ball bearing
Larger horsepower motors are stocked standard with a roller bearing on the
drive end. For direct-coupled applications, a Ball bearing must be installed
on the drive-end.
Lead-time is 2 days.
Sealed Bearing
This modification provides the option of replacing the standard bearings in
AC motors with sealed bearings and replacing the grease fittings with plugs.
May not be suitable for belted applications. 250 - 449 frame, 3600RPM, no
sealed bearing option. 250 - 445, 1800RPM and below, non contact sealed
only. 48 - 215, All RPM’s are available for sealed bearings. Consult Marathon
Motors for full application details. Call for lead-time.
Insulated Bearing
Insulated bearings are used to reduce the transmission
of shaft currents. In accordance with NEMA MG1-31.4.4.3, both bearings
must be insulated to protect inverter-driven motors from inverter-sourced
shaft voltages. The connected load must also be insulated from the motor
shaft to prevent damage to it’s bearings. Per UL, insulated bearings may not
be installed in Division 1 or Division 2 hazardous locations. Division 2 will be
removed from XRI
®
-Severe Duty and IEEE 841 motors when this modification
is performed. Call for lead-time.
Blowers - MOD19 (Mult. Symbol S4)
Low rotational speeds, common in many vector drive applications, cause
additional heat within the motor. As a result, these motors are designed
as TENV or TEBC. Marathon Motors offers two types of blower units,
depending upon the application requirements. The axial blower is available
on Marathon’s XRI
®
and XRI
®
-Severe Duty.
Axial Blower
Most TEBC requirements are satisfied with Marathon’s axial blower. The
blower motor and fan are in the same (horizontal) plane as the motor drive
shaft. Lead-time is 3 days.
C-Face Brackets - MOD2 (Mult. Symbol S4)
The addition of a C-Face kit to a standard foot mount (rigid base) motor,
results in a non-NEMA “BA” dimension in 143-256 Frames due to NEMA’s
establishment of two distinct “BA” dimensions for each of the affected frame
sizes: one for rigid base motors and another for C-Face/rigid base motors.
No motor manufacturer can meet both prescribed dimensions on reworked
motors. The following table identifies the “BA” dimensions (defined as the
distance from the center of the front foot hole to the shaft shoulder) for
143T-256T and TC frames:
* C-Face Kit (rework) “BA” dimension is identical to foot mount
“BA.”
D-Flange Brackets - MOD17
(Mult. Symbol S4)
Add a D-Flange Kit to rigid base, cast iron motor. Available on Blue Chip 254T-365T
and Drip proof 284T-286T (“TTDP” and “TTDC” designs). Addition of D-Flange Kit
results in non-NEMA ‘BA’ dimension or 254T-256T. Lead time is 2 days.
IEC Brackets - MOD55 (Mult. Symbol S4)
B14 FT Flange (IEC C-Face)
IEC mounting arrangement with the motor flange at the drive end similar
to a NEMA C-Face motor. Modification includes motor disassembly
and installation of a FT Flange to a Globetrotter
®
motor. Lead-time is 2
days.
B5 FF Flange (IEC D-Flange)
IEC mounting arrangement with the motor flange at the drive end similar to
a D-Flange. Modification includes motor disassembly and installation of a FF
Flange to Globetrotter
®
motor. Lead-time is 2 days.
Brake Motors - MOD3 (Mult. Symbol S4)
Spring-set, electrically released mechanical disc brakes are available for
stopping and/or holding the load. Marathon’s brakes are suitable for any
angle mounting. Price of modification includes brake kit and installation.
NEMA FOOT
FRAME MOUNT* C-FACE
143T-145T 2.38” 2.75”
182T-184T 2.75” 3.50”
213T-215T 3.50” 4.25”
254T-256T 4.25” 4.75”
Marathon
Only
MARATHON ONLY MOTOR MODIFICATIONS