Universal Motors BF31 Manual De Instrucciones página 6

Ensure that the motor nameplate voltage is the same as the mains supply. Check also
that the connection is made according to the required voltage supply and/or speeds
( connections diagrams are enclosed in the motor terminal box)
Motor Protection
We recommend motor protection using overloads and short-circuit relays.
Motors must be earthed, using either the earthing screw in terminal box or fixed to
the motor frame.
Maintenance
All work on the motor must be made with the motor disconnected from the power
supply and by qualified personnel.
Motors not equipped with lubricating nipples are fitted with sealed for life bearings
which allow 20.000 hours service under normal working
Motors equipped with grease nipples are lubricated with lithium grease and must be
re-lubricated according to the table.
HORKING HOURS
QT.
BEARING 3000RPM 1500RPM 1000RPM
GREASE
6311 C3 18g 2150 3750 5150
6312 C3 20g 2000 3500 5000
6313 C3 25g 1750 3250 4400
6314 C3 28g 1500 3000 3750
6317 C3 37g 1250 2500 3750
6319 C3 45g 1250 2250 3250
NU 319 45g 1150 1750
Re-lubrication should be carried out with the motor running , with care being taken
by the personnel carrying out the service. It is recommended that the lubrication
periods be shortened if the motor is to operate under hard conditions, high humidity
or pollution, high bearing loading, excessive vibration, high ambient temperatures,
etc.
The bearings should be examined every two years and replaced if necessary.
Again, if motor is operating under hard conditions the examination should be made
sooner.
Care should also be taken to ensure that cooling air entries and surfaces are kept
clean, the cleaning periods depend on the dirt in the environment.
Whilst the bearings inspection maintenance is being carried out, it is recommended
that a general cleaning of all active parts is carried out, and a long drying out of the
winding if necessary.
Inverters
If the motor is to be used with a frequency inverter all inverter manufacturer recom-
mendations should be observed including the electromagnetic compatibility, cable
types and connection cables.
If used for long periods at low speed the motor ventilation is compromised it is
recommended that forced ventilation should be used.
conditions.
750RPM
6750
6500
5500
5000
4400
3750
2250
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Spare Parts
To order spare parts it is necessary to indicate motor type and serial number stamped on
the nameplate.
Dismantling
NOTE
— Before dismantling any part check that the motor has stopped
and is disconnected from the supply cable.
FAN COVER
— Loosen fastening screws and pull of the fan cover.
FAN
— Remove the fan using the correct tool (bearing pullers). Be careful to not
damage the plastic fan. Damaged fans should be replaced as it will cause over heating
of the motor.
END SHIELDS/FLANGES
— Loosen all fastening screws, remove the shaft key
and then pull off the end shields keeping them square to the motor axis. The use of
inadequate tools can cause damage to the winding inside the motor.
ROTOR
— After the end shields have been removed the rotor slides out freely.
NOTE - take special care when removing the rotor not to damage the motor winding.
Recycling
The motors are made of various types of metal and plastic. At the end of the
motors life these should be separated and deposed of at an appropriate recy-
cling site.
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