Siemens Medallion 1200 Instruction Manual download pdf (Page 12)

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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

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Siemens Medallion 1200 Instruction Manual Page 12

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