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12838 Stainless Drive, Holland, MI 49424
ELECTRIC MOTORS, Cont.
Electric motors operating under normal conditions
become quite warm. Although some places may feel hot
to the touch, the unit may be operational within limits.
Use a thermocouple to measure winding temperature.
The total temperature, not the temperature rise, is the
measure of safe operation. Investigate the operating
conditions if the total temperature measured by a
thermocouple placed on the windings exceeds:
230°F (110°C) for class "B" insulation
275°F (135°C) for class "F" insulation
302°F (150°C) for class "H" insulation
VOLTAGE REGULATION
Motors will operate successfully under the following
conditions of voltage and frequency variation, but not
necessarily in accordance with the standard established
for operation under rated conditions:
1. When the variation in voltage does not exceed
10% above or below normal, with all phases
balanced.
2. When the variation in frequency does not exceed
5% above or below normal.
3. When the sum of the voltage and frequency of the
voltage does not exceed 10% above or below
normal (provided the frequency variation does not
exceed 5%).
MAINTENANCE
Failure to properly maintain the equipment can result in
severe personal injury and product failure. The
instructions contained herein should be carefully
reviewed, understood and followed. The following
maintenance procedures should be performed regularly:
1. Bearing lubrication
2. Insulation resistance check
3. Cleaning
This checklist does not represent an exhaustive survey
of maintenance steps necessary to ensure safe
operation of the equipment. Particular applications may
require further procedures
Dangerous voltages are present in the equipment which
can cause severe personal injury and product failure.
Always de-energize and ground the equipment before
Copyright 2018 BRAWN Mixer
BTR-S
O
ERIES
www.BRAWNMIXER.com
11/27/2018
& M
PERATION
AINTENANCE
Phone: 616/399-5600 Fax 616/399-3084
maintenance. Maintenance should be performed only by
qualified personal.
The use of unauthorized parts in the repair of the
equipment, tampering by unqualified personal, or
removal or alteration of guards or conduit covers will
result in dangerous conditions which can cause severe
personal injury or equipment damage. Follow all safety
instructions contained herein.
BEARING LUBRICATION
Do not lubricate motor while in operation, since excess
grease will be forced through the bearings and into the
motor before it will force its way out the drain plug.
Excess grease accumulation on windings reduces
insulation life.
Prior to shipment, motor bearings are lubricated with the
proper amount and grade to provide six months of
satisfactory service under normal operation and
conditions.
For best results, grease should be compounded from a
polyurea base and a good grade of petroleum oil. It
should be of No. 2 consistency and stabilized against
oxidation. Operating temperature ranges should be from
-15°F to +250°F for class B insulation, and to +300°F for
class F and H. Most leading oil companies have special
bearing greases that are satisfactory.
Relubricate bearings every six months (more often if
conditions require), as follows:
1. Stop the motor. Lock out the switch.
2. Thoroughly clean off pipe plugs and remove
from housings.
3. Remove hardened grease from drains with stiff
wire or rod.
4. Add grease to inlet with hand gun until small
amount of new grease is forced out drain.
5. Remove excess grease from ports, replace inlet
plugs, and run motor ½ hour before replacing
drain plug.
6. Put motor back in operation.
M
ANUAL
CAUTION
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