Operation
Initial Start
CAUTION
Do not exceed number of Siemens specified hot and cold starts per hour.
Will cause overheating.
Allow time between starts to permit stator windings and rotor cage to cool.
NOTE
If motor has been out of service or in storage for more than 30 days, consult Siemens Storage Recommendations
Service
After installation is completed, but before motor is put in regular service, make an initial start as follows:
1.Check that motor, starting, and control device connections agree with wiring diagrams.
2.Check that voltage, phase, and frequency of line circuit (power supply) agree with motor nameplate.
3.Check motor service record and tags accompanying motor. Be certain bearings have been properly lubricated and oil wells are filled. See motor outline drawing to determine proper oil level.
4.If possible, remove external load (disconnect drive) and turn shaft by hand to assure free rotation. This may have been done during installation procedure; if so, and conditions have not changed, this check may not be necessary.
5.If drive is disconnected, run motor at no load long enough to be certain that no unusual condition exists. Listen and monitor for excessive noise, vibration, clicking or pounding and that oil rings are turning if so equipped. If present, stop motor immediately. Investigate the cause and correct before putting motor in service.
6.If drive cannot be disconnected, interrupt the starting cycle after motor has accelerated to low speed. Carefully observe for unusual conditions as motor coasts to a stop. Repeat several times if necessary. Refer to motor’s Starting Duty nameplate (if so equipped) or Motor Data Sheet for recommended number of starts and cooling period between starts.
7.When checks are satisfactory, operate at lowest load possible and look for any unusual condition. Increase load slowly to maximum, checking unit for satisfactory operation.
Oil Circulating Systems
For motors with oil circulating systems, proceed as follows before startup;
1.Fill motor reservoirs to normal level (see motor outline drawing).
2.Follow instructions provided by the oil circulating system supplier.
3.Put oil circulating system into operation before starting motor.
Normal Operation
Start the motor in accordance with standard instructions for the starting equipment used. Sometimes the load should be reduced to the minimum, particularly for reduced voltage starting, and/or high inertia connected loads.
Voltage/Frequency Variation
Motors will operate successfully under the following conditions of voltage and frequency variation, but not necessarily in accordance with the standards established for operating under rated conditions:
1.If the variation in voltage does not exceed 10% above or below rated voltage, with all phases balanced. Voltage unbalance should not exceed 1%.
2.If the variation in frequency does not exceed 5% above or below rated frequency.
3.If the sum of the voltage and frequency variations does not exceed 10% above or below rated values provided the frequency variation does not exceed 5%.
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