NBE BTR Series, Operation And Maintenance Manual

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BTR-S
ERIES
O
PERATION
& M
AINTENANCE
M
ANUAL
12838 Stainless Drive, Holland, MI 49424 Phone: 616/399-5600 Fax 616/399-3084

Copyright 2018 BRAWN Mixer www.BRAWNMIXER.com Page 6 of 9
11/27/2018
ELECTRIC MOTORS, Cont.
INSULATION RESISTANCE
Check insulation resistance periodically. Any approved
method of measuring insulation resistance may be used,
provided the voltage across the insulation is at a safe
value for the type and condition of the insulation. A hand
crank megger of not over 500 volts is the most
convenient and safest method. Standards of the Institute
of Electrical and Electronics Engineers, Inc., recommend
that the insulation resistance of the stator windings at 75°
C, measured at 500 volts dc, after one minute should not
be less than:
Rated Voltage of M 1000
=
Insulation Resistance
1000 in Megohms
This formula is satisfactory for most checks. For more
information, see IEEE Standard No. 43 “Recommended
Practice for Insulation Resistance Testing of AC Rotating
Machinery.”
CLEANING
WARNING
Do not attempt to clean the motor while it is operating.
Contact with rotating parts can cause severe personal
injury or property damage. Stop the motor and lock out
switch before cleaning.
The motor exterior must be kept free of oil, dust, water,
and chemicals. For fan cooled motors, it is particularly
important to keep the air intake openings free of foreign
material. Do not block air outlet or inlet.
On non-explosion-proof TEFC motors, a removable plug
in the bottom center of the motor frame or housing
permits removal of accumulated moisture. Drain
regularly.
MAINTENANCE / LUBRICATION
Gear units should have the oil changed every 10,000
hours or 2 years. If synthetic lubricant is used, it should
be changed every 20,000 hours or 4 years. For adverse
operating conditions, the interval should be shorter.
DO
NOT MIX SYNTHETIC AND MINERAL BASE OILS.
Units should be checked periodically for increased noise,
surface temperature, vibration, shaft movement and
amperage draw. Units with inspection covers should not
be operated with the inspection cover removed.
CAUTION
Oil should be changed more often if reducer is used in a
severe environment. (i.e. dusty, humid)
All reducers are shipped from the factory properly filled
with lubricant and all plugs are installed according to the
mounting position given on the reducer nametag.
Acceptable oil level is within ½ inch of the bottom of the
fill plug threads. Consult the sticker adjacent to the fill
plug to determine the type of lubricant installed at the
factory. Standard lubricant is ISO VG220 mineral-based
oil. However, some units have special lubricants
designed to operate in certain environments or to extend
the service life of the lubricant. If in doubt about which
lubricant is needed, contact Brawn.
TABLES 2 and 3
offer suggestions on the viscosity and
manufacturers of recommended lubricants.
CAUTION
In the Food and Drug Industry (including animal food),
consult the lubrication supplier for recommendation of
lubricants which are acceptable to the Food and Drug
Administration and/or other authoritative bodies having
jurisdiction. Factory supplied oil is not suitable for these
applications or this industry.