Sulzer MT Betriebs- Und Wartungsanleitung Seite 46

In case of types of coupling not covered by this manual, contact Sulzer technical assistance.
6. COMMISSIONING, OPERATION AND STOP
6.1 PRELIMINARY VERIFICATIONS
Before actual commissioning, in particular if the motor is not put into operation immediately after its installation, it is necessary:
Check the correct alignment of the group;
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Check the insulation resistance of the motor;
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Check the direction of rotation of the motor;
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Check that the fastening, connection and electrical connection elements are tightened with the appropriate torques;
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Check the state of the connections and that there is no dirt, dust, humidity or foreign materials inside the terminal block housing box;
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Check the state of lubrication of the bearings. For motors that have been stored or installed for more than two years and have not
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yet started operation, we recommend replacing the bearings or completely cleaning and relubricating them;
Check that the holes in the fan cover are not blocked;
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For single-phase motors: check the condition of the capacitors. For motors that have been stored or installed for more than two
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years and have not yet started operation, we recommend replacing the capacitors;
Check the condition of the complete assembly. Refer to the manual of the driven equipment, the coupling devices and any
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accessories for more details.
If any anomaly is found, search for the cause and remedy it before putting the group into operation.
6.2 STARTING
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ATTENTION!
6.3 CHECKS WHILE RUNNING
After a period of time sufficient to reach the rated operating conditions, check that:
There are no abnormal vibrations or noises.
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There are no abnormal fluctuations in the performance of the driven equipment.
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The absorbed current of the motor does not exceed the one marked on the plate.
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The bearing temperature does not exceed the ambient temperature by more than 55 ° C.
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In the presence of even one of these conditions, stop the group and investigate the cause.
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Check the unbalance between the phases for three-phase motors
Using an ammeter, check the absorption on the three phases, the value must be balanced (maximum acceptable unbalance 5%) and lower
than the motor rating current value.
Repeat the checks at regular intervals (approximately every 2000 hours of service).
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ATTENTION!
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Before starting the group make sure that all the prescriptions and checks described in the previous paragraphs
are respected.
Make sure the ground conductor is connected correctly.
Do not bring hands or any other part of the body, nor tools or similars, near the operating unit.
Start-up via soft-starter or VFD: the start-up transient must last no more than 5-6 seconds.
The outer surface of the motor can reach high temperatures and cause burns if touched, even under normal
operating conditions. It is recommended to protect it from accidental contacts, for example by means of grilles
or screens, such however not to interfere with its proper ventilation.
In the case of operation with VFD:
- for operation at frequencies below the nominal, check that, with the speed reduction, there is a
sufficient load reduction to prevent the motor from overheating (note: centrifugal pumps and fans
do not require this check).
- the maximum frequency must not exceed the rated frequency of the motor.
For other recommendations for use with a frequency converter, refer to the appropriate paragraph.
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- Translation of the original instructions