Przekładnia w higienizacji__UM_01_VSF_GB.pdf
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MAINTENANCE AND OPERATING
INSTRUCTIONS FOR WORM GEAR
REDUCERS AND GEARMOTORS
SERIES:
NMRV - MCV - NRV
NMRV+NMRV
PC+NMRV
GB
NMRV-UM-9 99/01
rev.15.07.99
2
Warehouse storage
Installation
Example of a pulley mounted correctly on the slow shaft of a reduction unit
When moving the unit, care should be taken to protect external parts from breakage or damage
due to accidental knocks or falls.
If the unit is to be stored in a hostile atmosphere or for a long period of time (2/4 months), it is
important to apply protective and waterproofing products to avoid deterioration of shafts and
rubber parts.
Before starting up the unit, carry out the following checks:
Check the data shown on the name plate of the reduction unit and/or the electric motor;
Check for any leaks of lubricant
If possible, remove any traces of dirt from the shaft and from the areas around the oil seal.
If the oil seal is not immersed in the lubricant inside the assembly during particularly long
storage periods (4/6 months) it is recommended that it should be replaced as the rubber
might stick to the shaft or even have lost the elasticity it needs to work.
Installation
Fig. 1
Particular care must be taken when installing drives, as this is often the source of damage
and down time. Careful choice of the type of drive and mounting position can often avoid the
need for protection of sensitive areas, particularly underneath the unit from oil leaks, however
limited they may be.
- The machine must be firmly fastened in place in order to prevent any vibrations.
- Whenever possible, protect the reduction unit from direct sunlight and bad weather, especially
when it is mounted on its vertical axis.
- Make sure the air intake on the fan side is unobstructed in order to ensure that the motor is
correctly cooled.
- In the case of temperatures of < -5 °C or > +40 °C, contact Technical Assistance.
- If the motor is to be started very often under load, the use of a heat probe inserted into the
motor is recommended.
- The various machine members (pulleys, gear wheels, couplings, etc.) must be mounted on
the shafts using special threaded holes or other systems that ensure correct operation
without risk of causing damage to the bearings or the external parts of the assemblies (fig.1).
- Lubricate the surfaces that come into contact in order to prevent oxidation or seizure.
Correct and incorrect examples of pulleys mounted on the main shaft of a reduction unit.
Fig. 2
A
B
3
Installation
Starting up
The unit should be started up gradually: do not immediately apply the maximum load the
machine is able to take ; look for and correct any malfunction that may be caused by incorrect
mounting.
Running-in is not essential for the reduction unit to run properly since modern construction
techniques for the gears and castings, the extreme cleanliness of the internal parts, and the
excellent qualities of the lubricants used, ensure that the internal parts receive a high degree
of protection even during the first moments.
Correct and incorrect examples of coupling connections
Fig. 3
Servicing
The high degree of finish of the internal parts ensures that the unit will work correctly with only
a minimum amount of servicing
Generally speaking, the following rules should be followed: periodically check that the exterior
of the assembly is clean, especially in the cooling areas; periodically check to see if there are
any leaks, especially in the areas around the oil seals.
Assemblies that are lubricated for life and thus do not have any oil plugs do not require any
special maintenance except as stated above.
For other assemblies, low maintenance is required with an oil change at 8/10,000 hours of
use. The change of oil naturally depends on the type of environment and use to which the unit
is put.
Apart from the normal maintenance rules given above, make sure the breather hole in the plug
is clean and, using the oil window, periodically check that there is sufficient lubricant.
Should it be necessary to top up with lubricant, use the same type that is already in the reducer
or one that is compatible with it.
In case of doubtful incompatibility between lubricants, we recommend you empty out the oil
from the gearbox completely and, before refilling with new oil, wash out the unit to remove any
residue.
When changing the oil, follow the previous instructions.
(A)
(B)
(C)
The pulley must be mounted on the main shaft as close as possible to the shoulder so that is
does not cause excessive radial load on the bearings (fig. 2).Great care must be taken when
connecting the couplings to ensure that they are well aligned, so as not to cause excessive
radial load on the bearings (fig.3).When it is applied, paint must never be used on rubber
parts: oil seal, etc. It must never be applied to any breather holes in plugs if they are mounted
on the unit.In the case of assemblies with oil plugs, remove the closed cap used for transport
and fit it with the breather plug that is supplied with the reduction unit.When the assembly is
supplied without a motor, the following precautions must be followed in order to ensure that
connections are properly made
Mounting the motor on the pam B5/B14 flange
Check that the tolerance of the motor shaft and the motor flange comply with at least one
‘normal’ class of quality. Carefully clean off any trace of dirt or paint from the shaft, the centering
diameter and the face of the flange. Carry out mounting operations making sure not to use
force. If this is not possible, check the tolerance of the motor key and ensure that it is correctly
fitted. Apply assembly grease to the shaft in order to prevent oxidation or seizure caused by
contact.
Good quality motors should be used in order to ensure that the unit works correctly, without
vibrations or noise.
Before mounting the unit on the machine, check that the principal shaft of the reduction unit
rotates in the right direction.
Troubleshooting
If any problems should arise when starting the unit or during its first few hours of operation,
contact the after sales service unit of Motovario.
The table shows a series of problems with a description of possible remedies.
It should be kept in mind however that the information given is for reference only, as all the
drives manufactured by Motovario are thoroughly tested and checked before they leave the
factory.
Please note that tampering with the assembly without prior authorization from Motovario
immediately invalidates the warranty and often makes it impossible to ascertain the causes of
a defect or malfunction.
Use the oil window, if present, to check that the lubricant reaches the correct level required for
the mounting position used.
4
Troubleshooting
Troubleshooting
PROBLEMS
CAUSES
ACTION (1)
ACTION (2)
PROBLEMS
CAUSES
ACTION (1)
ACTION (2)
Return the assembly to
Motovario if there is
significant noise when
loaded.
No practical problem if
the noise has no effect on
the application.
Intermittent noise from
the gears.
Problems with power
supply. Defective motor.
Wrong size of motor.
Dirt inside the gearbox.
The motor does not
start.
Check power supply.
Replace electric motor.
Bearings incorrectly
adjusted. Gears with mesh
errors. Insufficient
lubricant.
Noise (whine) from the
drive assembly.
Check correct quantity of
lubricant.
Return the assembly to
Motovario.
Current absorbed by
the motor is greater
than shown on the
data plate.
Replace the electric
motor and, if necessary,
the reduction unit.
Wrong size of motor.
Check the application.
Check geometric
tolerance of flange on
electric motor. Check
tolerance and geometry
of key on motor shaft.
Misaligment of the
assembly coupling.
Temperature of the
motor housing is very
high.
Defective motor. Wrong
size of motor. Incorrect
mounting of motor
Replace the electric
motor and, if necessary,
the reduction unit.
Electric motor vibrates.
Replace electric motor.
Check the application.
Wrong size of reduction
unit. Mounting position
does not comply with the
order. Incorrect mounting
of motor
Correct the working
conditions: mounting
position and/or lubricant
level.
Temperature of the
reduction unit housing
is very high.
Check the application.
Incorrect rotation
speed of the main
reducer unit shaft.
Incorrect reduction ratio.
Incorrect polarity of motor.
Check reduction ratio.
Check polarity of motor.
Replace reduction unit
and/or electric motor.
Defective oil seal. Oil seal
damaged during shipment.
Defective motor shaft.
Replace the oil seal.
Repair motor shaft (if
possible).
Replace the part or return
the assembly to
Motovario.
Oil leak from oil seal.
Flat gasket or O-ring
damaged.
Replace damaged gasket
or O-ring.
Return the assembly to
Motovario.
Oil leak from joint.
The main shaft rotates
the wrong way.
Incorrect connection of the
electric motor.
Swap two phases of the
motor supply.
Return the assembly to
Motovario if there is
significant noise when
loaded.
No practical problem if
the noise has no effect on
the application.
Intermittent noise from
the gears.
Dents in the gear wheels.
5
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