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PROBLEM
LOW OUTPUT TORQUE
1. Improper alignment of feedback dev ice
2. Open pow er connection.
3. Open or shorted stator w indings.
4. Motor may be partially demagnetized.
ROUTINE MAINTENANCE
Observe the motor during operation, checking for excess
vibration, unusual noises and excess heat.
1. VIBRATION
1.
Check for signs of excess vibration. It may be the result of
poor alignment, worn or loose couplings or sheaves, or
damaged bearings. It may be a poorly designed base. Excess
vibration causes damage to the bearings, shaft, mounting feet and
accessories.
2.
Noise on the speed reference input to high performance
drives has been known to cause vibration in motors.
3.
When checking balance on an unloaded motor, install a half
key in the shaft keyway.
2. NOISE
1.
Listen for noise in the area of the bearing housings.
Rubbing noises may be a sign of internal damage.
2.
A steady high pitched hum is normal in a BLDC motor, and
there may be short interruptions of this hum under no load
conditions. If you hear growling or an erratic hum above 20
RPM, check the drive.
3. TEMPERATURE
1.
Drip Proof Fully Guarded (DPFG), Drip Proof Blower
Ventilated (DPBV), and Totally Enclosed Air Over (TEAO)
motors may run at surface temperatures in excess of 85°C.
2.
Totally Enclosed motors (TENV) may have surface
readings as high as 100 °C. Before checking the temperature of
a motor, check the load on the motor.
Use a thermal probe for an objective reading
DO NOT CHECK MOTOR TEMPERATURE WITH YOUR
BARE HAND!!! HIGH TEMPERATURES MAY CAUSE
4. FEEDBACK DEVICE
1.
The feedback device is located inside the motor. It requires
no maintenance unless you disassemble the motor.
2.
The alignment of the motor feedback device is important. If it
is removed, it must be re-installed correctly.
5. BRAKES
1.
Brakes supplied on "F" series Brushless DC motors are
fail-safe, disk type brakes. You release the brake by energizing
the brake coil. There may be a manual release.
POW ERTEC "F" Series Motor Manual
BURNS!
2.
The brakes do not normally require adjustments, but the
pads may have to be changed periodically if the brake is used for
stopping duty.
6. SECONDARY FEEDBACK DEVICE
Check externally mounted encoders (coupling and mounting
bolts) periodically for tightness.
7. COOLING BLOWERS AND FILTERS
Cooling blowers are AC motors that require little maintenance.
They have a lubrication life of 15,000 to 40,000 hours.
ATTEMPTING TO SERVICE THE FILTER WHILE THE BLOWER
MOTOR IS RUNNING MAY CAUSE INJURY.
1.
Be sure the blower is running in the correct direction, which
is in the direction of the arrow on the blower scroll.
2.
Clean out multi-crimp filters with a solvent. Let dry
thoroughly. Spray with an air filter adhesive and drain excess.
3.
Before re-mounting the filter, be sure that there is no
build-up of material inside or on the blades of the impeller.
8. BEARINGS AND RE-LUBRICATION
1.
42, 140, and 180 frame motors have permanently
lubricated bearings. Replace damaged or worn bearings.
2.
Frames 210 and larger are lubricated at the factory with
Chevron SRI #2 grease. Suitable substitutes are Amoco's
RYKON Premium #2, Texaco's Polystar B, or EXXON's Polyrex.
Do not use the "EP" versions of these greases. High-speed
motors use Kluber HB72-52.
3.
Use the table below for bearings of standard motors with
standard or maximum capacity bearings. These motors have a
"0" or "1" as the 10th digit in the Model Number. Re-lubricate
vertically mounted motors at 1/2 the table interval.
4.
Roller bearings are indicated by a "2" in the tenth position
of the Model Number. Re-lubricate these at 1/2 of the table
interval. For vertically mounted motors, use ¼ of the interval. For
high speed motors, consult the graph on page 16. High-speed
motors have a "9" in the tenth position.
© copy right 2012 by P O WE R TEC Industrial Motors, Inc.
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