Siemens 1LG0 Manual
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Answers for industry.
1LG0 low-voltage motor
Installation and Maintance Manual
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Chapter
1.0 INTRODUCTION 4
1.1 Application Scope 4
1.2 Construction Type 4
2.0 HANDLING AND STORAGE 5
3.0 COMMISSIONING 6
3.1 Installation 6
3.2 Terminal Box 6
3.3 Balancing and Transmission Coupling 6
3.4 Electrical Connection 7
3.5 Insulation Resistance Inspection 9
3.6 Drive Application 10
4.0 MAINTANCE 11
4.1 Bearing Lifetime 11
4.2 Grease Type 12
4.3 Grease Lifetime and Regreasing Intervals 12
4.4 Regreasing Procedure 13
4.5 Bearing Replacement 14
4.6 Drain Plug 15
5.0 START UP 16
6.0 SPARE PARTS 17
2
3
The data and recommendations specified in all of
the instructions supplied ("Information on safety and
commissioning”), must always be observed in order to
avoid hazardous situations and the risk of personal injury
or equipment damage.
Furthermore, the pertinent national, local and plant-
specific regulations and requirements should be kept in
mind and observed!
Special designs may vary in technical details. If in doubt,
please contact the manufacturer, referencing the type
designation and serial number (see rating plate), or have
the installation, service and maintenance work executed
by one of the SIEMENS Service Centers.
3
4
1.0 INTRODUCTION
1.1 Application scope
Prescribed use of 1LG0 standard motors according to IEC 60034-5:
The standard motors are provided with degree of protection IP55 and can be used in a
dusty and damp environment. A suitable canopy cover is recommended if the motors
are installed outdoors with exposure to direct sunlight, rain, snow and ice. For B5
mountings where the DE shaft is pointing downwards a canopy is necessary to prevent
foreign objects from entering the fan cowling and restricting air flow. When the DE
shaft is pointing upwards, additional care must be taken to prevent the ingress of water
and liquids into the motor housing along the DE shaft.
Please refer to the following environmental application conditions.
• Installation Altitude ≤1000m ASL
• Ambient temperature +40ºC
• Operating temperature range -20ºC ~ +40ºC
• Relative Humidity
-20ºC ≤ T ≤ 20ºC 100%
20ºC ＜T ≤ 30ºC 95%
30ºC ＜T ≤ 40ºC 55%
Note: If the ambient conditions and site altitude is different from the above
mentioned, please review the derating table in the 1LG0 Catalogue.
1.2 Motor construction and types
1LG0 motors are totally enclosed and self-ventilated (TEFC) by a bi-directional fan
mounted on the NDE of the rotor shaft. Care must be taken to ensure adequate
clearance for maximum air flow and cooling. If the optional external blower is used, the
correct direction of air flow must be taken into consideration for proper cooling.
5
2.0 HANDLING AND STORAGE
When lifting the motors, always use the lifting eyes provided. Prior to lifting the motor
make sure that the lifting eyes are installed correctly and tightened. Never lift a motor
using the rotor shaft and fan cowling. In addition care must be taken during lifting and
lowering of the motor to avoid any shocks or vibrations which can result in bearing
damages.
It is recommended that all motor be stored in a dry, dust free environment and free of
excessive vibrations.
If the DE and NDE bearings are of the sealed types, it is recommended that they are
replaced if storage has exceeded 2 years from date of motor manufacture. If the motors
have the regreasable bearings, then the recommendation is to replace the grease after
2 years of storage.
The service life of the motor can be considerably reduced if the storage period
extends beyond 2 years in environments with high moisture and dirt. If necessary, the
insulation resistance of the winding could be measured determine the health of the
motor prior to installation and start-up, (see Section 3.5. for reference values).
Machined surfaces (flange, DE rotor shaft) are treated at the factory with an anti
corrosive agent to prevent rusting. However these surfaces should be retreated during
storage as deemed necessary. In addition the motor shaft should be rotated by hand on
a frequent basis to ensure even grease distribution.
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3.0 COMMISSIONING
All work must be carried out by a skilled worker.
Before starting any work, be sure to isolate the machine
from the main and auxiliary power supply as applicable.
Mains must be secured against accidental switch on.
3.1 Installation
Lifting eyes are screwed in place and must be tightened prior to and removed after motor
installation. If the motor is installed vertically with the DE shaft facing downwards, a
protective canopy is recommended to cover the fan cowling. This canopy is necessary to
prevent the ingress of water and foreign objects that may inhibit proper fan operation.
If the DE shaft is facing upwards, a protective canopy and / or suitable protective measures
must be taken to prevent liquids from entering the motor windings via the shaft.
Care must be taken to install the motor on a solid foundation so as to avoid excessive
vibration which can result in premature bearing failure.
3.2 Terminal box
Terminal box is either top or side mounted (LHS or RHS) on the motor and can be rotated
4 times by 90º thus allowing for multiple cable entry possibilities.
3.3 Balancing and coupling of transmission elements
To ensure a quiet and vibration free operation, proper angular and radial alignment of a
balanced transmission element (coupling, pulleys, fans, gear box, etc.) is essential.
As standard, the 1LG0 rotors are dynamically balanced using a half feather key as
indicated on the ratings name plate (H=Half Key).
It is necessary to replace the V-ring on DE with an oil seal when coupling a gearbox to
motors from FS80 to FS132.
Note: • The transmission and coupling elements are required to be half-key balanced
to ensure a vibration free operation.
• Coupling and motor temperature considerations must be taken into account
during alignment of the transmission.
•
Key must be removed form the motor shaft prior to starting if no transmission
is coupled.
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3.4 Electrical connection
All work must be carried out by skilled worker.
Before starting any work, be sure to isolate the machine
from the main and auxiliary power supply as applicable.
Mains must be secured against accidental switch on.
There are six power terminals and one earthing terminal located in the terminal box for
FS80 to FS355. For FS315 and FS355, there is an additional earthing point located on the
base of the frame. All motors are suitable for bi - directional rotation (CW or CCW). Phase
change can be achieved by interchanging any two phases.
Mains Power Connection
Windings of standard three-phase single speed motors can be connected either in
star or delta or star-delta connection. Voltage and frequency deviations of ±5% Vac
and ±2% Hz respectively of the rated voltage and frequency values are acceptable for
proper operation.
Cable Connection Examples FS315 & FS355 External Earthing
Size M4 M5 M6 M8 M10 M12 M16
Torque (Nm) 1.2 2.5 4.0 8.0 13 20 40
Table 1
Please refer to Table 1 for tightening torque and direction for electrical terminal lugs.
Note: Tightening Torque (Nm, Tolerance: ±10%)
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Star connection
A star connection is obtained by connecting W2, U2, V2 terminals to each other and
the U1, V1, W1 terminals to the mains.
Star-delta connection
Star-delta starting allows a peak current reduction. It can be used only when the
reduced starting torque obtained is higher than the resistant torque. Actually, it should
be noted that the torque of an induction squirrel-cage motor is directly proportional
to the square of the voltage. Motors whose rated voltage with delta connection
corresponds to the mains voltage can be started with the star-delta method.
Note: If the auxiliary or mains cable entries on the terminal box is sealed with gland
plugs, a flat (standard) screw driver is required for removal.
Delta connection
A delta connection is obtained by connecting the end of a phase to the beginning of
the next phase.
U1
U2
(
V2, W2
)
V
1
W1
U1
(
W2
)
V1
(
U2
)
W
1(V2)
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Table 2
A11 A12 A60 A61 A72 K45
PTC PTC PTC U V W UVW
Thermometers
for
rolling-contact
bearings
Heater
U1 U2 V1 V2 W1 W2 DE NDE
C1 C2 C1 C2 C3 C4
T1
T2
T3
T4
T5
T6
T1
T2
T7
T8
T3
T4
T9 T
10
T5
T6
T
11 T
12
T
13 T
14
T
15 T
16 P1 P2
T1 T3 T5 T1 T7 T3 T9 T5 T
11
T
13
T
15
Aux terminal Connection
If the motors are configured with the options A11, A12, A60, A61, A72 or K45, the
auxiliary terminal connection is shown in Table 2.
Protection
1LG0 motors have two types of electrical protection available as an option:
• PTC - used for temperature alarming or tripping function
• PT100 - used for alarming or tripping function
Note:Both the PTC and PT100 require connection to an external control unit.
Motors which are exposed to a wide temperature fluctuation during standstill are
susceptible to condensation formation, hence it is strongly recommended that a space
heater be added.
When PT100s are used for bearing temperature monitoring, the alarming
and tripping values are independent of those of the winding class.
Warning!
Warning!
The space heater must never be energised during motor operation.
Warning!
Warning!
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3.5 Insulation resistance inspection
After extended periods of storage or standstill (6 months or longer), it is recommended
to measure the insulation resistance between phases and phase to ground prior to
applying power at start-up.
Insulation resistance
The minimum insulation resistance between new, cleaned or repaired windings with
reference to ground is 10MOhms.
The critical insulation resistance (Recruit) is calculated by multiplying the rated voltage,
e.g. 0.69KVac, with the constant factor (0.5MOhms / kV):
Recruit = 0.69kV * 0.5MOhms / kV =0.345MOhms
Measurement
The minimum insulation resistance between the windings and ground measurement is
taken at 500Vdc and at a winding temperature of 25ºC ± 15ºC.
Corrective measures
If the minimum insulation resistance is measured at less than 10MOhms
Cause: Might be due to high humidity.
Correction: Windings must be dried.
Cause: After extended periods of operation, the minimum insulation resistance may
decrease. However as long as the measured value is not less than the Recruit values the
motor will continue to operate.
Correction: If the measured value is less than the Recruit value then the motor must be
replaced or repaired.
During and shortly after the resistance measurement, the motor terminals
are hazardous with a residual voltage charge. Avoid touching the terminals.
Warning!
Warning!
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