1.- The first startup of the motor must be done without any load or
mechanism connected to motor’s shaft. Parameters such as current,
voltage, power consumption and temperature shall be measured and
compared against nameplate data. Check direction of rotation. If the motor
is energized, but this does not start or if vibration, noise or excessive
current draw are present, immediately switch off electrical supply.
Investigate and correct the failure. If the motor is equipped with roller
bearings on the drive end this first startup must be brief in order to avoid
damage to the bearings.
2.- The use of electronic devices to achieve soft starts is recommended to
avoid high values of current during startup.
3.- If a reduced voltage start method is to be used, it is important to
consider that the torque output will be lower in the same proportion. For
further information and/or technical support on our motor starting solutions,
please consult your local SIEMENS sales office.
4.- Check the mechanical operation for noises or vibrations at the bearings
and bearing end shields.
5.- Monitoring the electrical and temperature values during initial and
subsequent operation to verify correct operation.
6.- Verify in a reasonable period the voltages values of the line (High / Low)
and evaluate those conditions.
7.- Verify that the protective guards and hoppers of the parts in movement
are well insured to avoid accidents.
CAUTION: Repeated trial starts can overheat the motor and may
result in motor burnout (particularly for across the line starting). If repeated
trial starts are made, allow sufficient time between trials to allow heat to
dissipate from windings and rotor to prevent overheating.
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