Siemens 680 - Manual (Page 11)

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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.
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%.
NOTE
If motor has been out of service or in storage for more
than 30 days, consult Siemens Storage
Recommendations ANIM-03114, Preparation for
Service