MOTOR-SK

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GB.MOTOR.050101

Instructions for the Operation and Maintenance of
Electric Motors
General
WEG
These instructions deal with electric motors used in the
applications from Swegon. The information presented is
aimed at facilitating the work involved in their operation
and maintenance as well as making it easier to trace any
faults that may arise.
Safety Precautions
Before you begin any work on the motor:
- Remove your wristwatch and rings.
- Make sure that the power supply is isolated.
- Always follow the instructions and regulations.
”Caution!” and ”Important!” Notes
”Caution” and ”Important” appear where the information
below is of special importance. An explanation of both is
given below.
Caution!
foreword.p65
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26/12/99, 09:18
!
Warns of risk of injury or danger to life and risk of serious damage to the motor.
Important!
N.B. There is risk of damage to motor.
Specifications are subject to alteration without notice.
www.swegon.se
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GB.MOTOR.050101
1. Instructions for Operating the
Motors
When the electric motor is installed and taken into operation, it will need to be checked and serviced with regular
intervals to ensure good operating economy and a long
useful life. The type of motor installed and how it is used
determines the length of the intervals between inspection
and service. If the motor should malfunction, take the
system out of operation and carry out maintenance on the
motor. Follow the servicing instructions.
The fault-tracing table below is intended for use as an aid
in trouble-shooting. The table provides examples of possible causes and symptoms. 1.1 Fault tracing
Cause:
Impermissible load can cause:
Symptom:
The motor becomes
overheated.
The motor won’t start.
The motor consumes too much
power.
Rotor problems may cause:
Low starting torque
The motor consumes too much
power.
The motor becomes
overheated.
Irritating noise
Abnormally high vibration
Too much or too little grease can cause: Bearings become too hot.
A bent axle can cause:
Bearings become too hot.
Irritating noise
Abnormally high vibration
Bearing problems can cause:
Irritating noise
Abnormally high vibration
Ventilation problems can cause:
The motor becomes
overheated.
Power supply problems can cause:
The motor won’t start
Low starting torque
Faulty voltage
The motor becomes
overheated.
Imbalance in the voltage can cause:
Abnormally high vibration
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Specifications are subject to alteration without notice.
GB.MOTOR.050101
2. Maintenance
Caution!
!
Isolate the power to the motor before beginning any maintenance work and make sure that all accessories are switched off and disconnected.
Important!
Only qualified and/or authorised personnel are permitted
to carry out maintenance on the motor.
Points to Check:
Maintenance should be carried out on the motor if anything abnormal is discovered.
1. Keep the motor clean and make sure that the air intakes are clear and unblocked.
Use a soft brush or a cotton cloth whenever cleaning is
required.
Use compressed air to remove dust or the like from the
fan casing.
2. Check the condition of gaskets or v-rings and replace
them if necessary.
3. Check the condition of couplings and screws for tightness.
4. Check the bearings, bearing temperature, the condition of the lubricant and listen to
detect any unusual noise and/or feel any abnormally
high vibration.
2.1 Lubricating
Important!
The max. permissible in-operation temperature of the
bearings and the lubricant is 70 °C.
This temperature should not be exceeded. Otherwise, the
interval between lubrication will have to be shortened by
half for every 15 °C that the in-operation temperature
exceeds 70 °C.
Note that unless otherwise specified on the motor rating
plate, the max. permissible ambient temperature is 40 °C.
Caution!
!
Motors up to size 160 are fabricated without grease fittings.
The size 160-200 motors are normally supplied without
grease fittings, but variants with grease fittings are available as an option.
The motors larger than size 200 are fabricated with grease
fittings.
The motors without grease fittings can be lubricated in
following manner:
1. Isolate the power supply. Carefully disassemble the
motor so as not to damage the
rotor, stator or stator windings. Use appropriate tools
and methods for this work.
2. Remove all old grease.
3. Wash the bearings with petrol or diesel oil and inspect
the bearings.
4. Add new lubricating grease into bearings and 50-70 %
of the space in bearing casing.
Be careful to fill the right amount of lubricant. 5. Carefully reassemble the motor so as not to damage
the rotor, stator or stator
windings. Important!
Check everything before you energise and start up the
motor.
Motors with grease fittings can be lubricated as follows:
(If the grease outlet is plugged, remove the plug before
lubricating. The grease outlet should be permanently left
unplugged if the motor is fitted with an automatic lubricator).
1. Carefully clean the grease fittings.
2. Keep the motor running while you inject the appropriate amount of grease into your
motor, using a lubricating gun (see the table or the
rating plate on motor).
3. Then let the motor run for a little while to distribute the
grease.
If the grease fitting isn’t accessible, proceed as follows:
1. Remove any hoods that are in the way.
2. Inject about half of the amount of grease required and
run the motor at full speed
for about one minute.
3. Switch off the motor and inject the rest of the grease.
Important!
Injecting the entire amount of lubricant into the motor
that isn’t running will allow the grease to force its way
past the motor’s inner seal, which is undesirable. Use a manual lubricating gun only.
Grease can cause skin irritation and eye inflammation.
Follow all the safety precautions specified by the supp
lier of the grease.
Specifications are subject to alteration without notice.
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GB.MOTOR.050101
2.2 Lubricant
Use only the types of grease specified below for lubricating bearings:
- First class lithium-based lubricant or lithium lubricant.
- Viskositet 100-140 cST vid 40 °C
- Consistency: NLGI Grade 2 or 3.
- Temperature range: -30 °C to +130 °C, continuous.
A lubricant called Polyrex EM is also available and is described in Item 2.4.
The type of grease and the lubrication interval for special
applications is specified on a special rating plate.
Caution!
!
If standard motors are used at special locations or in special applications, get in touch with the lubricating grease supplier or WEG for advice.
2.3 Lubrication Interval Table: (First class lithium-based lubricant or lithium lubricant.)
The values tabulated below are applicable to the bearing’s
and the lubricant’s max. permissible operating temperature of 70 °C. The intervals between lubricating should be
shortened by half for every 15 °C that the operating temperature exceeds the max. permissible temperature.
Size
(IEC)
Amount of 3600
grease
r/min
(g)
Ball bearings
160
180
200
1800
r/min
1500
r/min
1000
r/min
500-900
r/min
Lubrication intervals in hours
10
4300
5900
9500
10900
12700
14400
15
3800
5400
9300
10300
12400
14300
225
250
280
315
30
1100
2000
4100
4700
5700
6500
40
700
1600
3700
5400
5400
6100
355
50
-
800
3100
4000
5000
5700
Roller bearings
4
3000
r/min
Lubrication intervals in hours
200
15
1600
2700
6800
8300
9600
10700
225
30
700
1100
2800
3600
4400
5000
250
280
315
30
1100
2000
4100
4700
5700
6500
40
700
1100
2800
3600
4400
5000
355
50
-
-
1900
2600
3900
4400
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Specifications are subject to alteration without notice.
GB.MOTOR.050101
2.4 Lubrication Interval Table: (Polyrex EM lubricant, compatible with lithium-based lubricants and lithium lubricants).
The values tabulated below are applicable to the bearing’s
and the lubricant’s max. permissible operating temperature of 70 °C. The intervals between lubricating should be
shortened by half for every 15 °C that the operating temperature exceeds the max. permissible temperature.
This chart is applicable only to motors on which Polyrex
EM is specified on the rating plate.
Size
(IEC)
160
180
200
225
250
280*
280
315*
315
355
Amount of 3600 3000 1800 1500 1200 1000
900
750
720
600
500
grease
r/min r/min r/min r/min r/min r/min r/min r/min r/min r/min r/min
(g)
Ball bearings
Lubrication intervals in hours
13
18
21
27
27
27
34
27
45
27
15700
11500
9800
3600
3600
3600
18100
13700
11900
4500
4500
4500
3600
4500
2400
4500
3600
20000
20000
20000
9700
9700
20000
20000
20000
11600
11600
20000
20000
20000
14200
14200
20000
20000
20000
16400
16400
20000
20000
20000
17300
17300
20000
20000
20000
19700
19700
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
20000
8500
10400
12800
14900
15900
18700
20000
20000
20000
7000
9000
11000
13000
14000
17400
17400
20000
20000
20000
19700
19700
18700
15100
15100
20000
20000
20000
18700
15100
15100
20000
20000
20000
20000
15500
15500
20000
20000
20000
20000
19000
19000
Roller bearings
200
225
250
280
315
355
21
27
27
34
60
60
9800
3600
3600
11900
4500
4500
3500
20000
9700
9700
8500
5100
5100
Specifications are subject to alteration without notice.
20000
Lubrication intervals in hours
20000
11600
11600
10400
7200
7200
20000
14200
14200
12800
9200
9200
20000
16400
16400
14900
10800
10800
20000
17300
17300
15900
11800
11800
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GB.MOTOR.050101
2.5 Service
Caution!
!
Isolate the power to the motor before beginning main
tenance service and make sure all accessories are swit
ched off and disconnected.
Important!
Only qualified and/or authorised personnel may carry out
service on the motor.
Important!
Make sure to specify the correct type designation and production code as well as the serial number when ordering
spare parts. You’ll find these on the rating plate.
2.5.1 Bearings
It is important that bearing replacement is carried out
under clean conditions to ensure good performance and
to avoid damage.
Let the new bearing remain in its packaging until it is time
to fit it on the motor shaft.
Before fitting the new bearing, check that there are no
sharp edges or any other defects on the motor shaft.
It is advisable to place a piece of stiff cardboard between
stator and rotor prior to replacement, to protect them
from damaging one another.
Use special tools available for the removal of bearings.
The stator should be mounted against the inner ring inside
the shield.
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3. Motors operated across a Frequency Inverter, VFD
3.1 Standard Motors
If the voltage is less than 440 V, no motor filters / outlet
filters are required.
If the voltage is 440 V or less than 575 V, motor filters are
required if the connection cable is longer than 20 m.
If the voltage is 575 V, motor filters are required regardless
of the length of connection cable.
The use of a VFD without filter can affect the performance
of the motor as follows:
- Lower efficiency
- Higher level of vibration
- Higher sound level
- Higher rated current
- Higher temperature rise
- Reduced motor insulation
- Shorter bearing life
3.2 Special Motors for Frequency Inverter
Operation, of WEG IDM type
Motor filters / outlet filters aren’t needed, regardless of
voltage.
If the motor is equipped with separately operated cooling
fan, check its power supply voltage.
Caution!
!
The warranty won’t be valid if these instructions are not
followed.
Specifications are subject to alteration without notice.
GB.MOTOR.050101
4. Motors for Hazardous / Explosive
Environments
Follow these instructions for the maintenance of
motors in these environments:
- Check that all components are free of sharp edges,
deformation and dirt.
- Check that all the parts are in perfect condition.
- Lubricate the surface on the shielded bearing mounts
with oil to facilitate mounting.
- Use a rubber hammer only for mounting the parts.
- Check the bolts to make sure that they are correctly
tightened.
- Use a gauge to fit the connection plate correctly (gap
less than 0.05 mm).
Caution!
!
The customer is responsible for site and environment
where the motor is installed.
Motors for these environments are fabricated in accordance with a specific standard for such zones and are
certified by the appropriate international classification associations.
Caution!
!
The certification will be rejected if electrical or mechanical modifications are made on a motor installed in a
hazardous environment.
The maintenance of motors used in these types of environments must be carried out in workshops authorised by
WEG.
If a workshop not authorised by WEG carries out maintenance on the motor, that workshop will be responsible for
any damages incurred.
Specifications are subject to alteration without notice.
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