Energizing - Siemens 1LA8 Series Operating Instructions Manual

• If the mechanical operation improves immediately
after switching the motor off, then the cause is
magnetic or electrical. If the mechanical operation
does not improve immediately after switching the
motor off, then the cause is mechanical: e.g. an
imbalance in the electrical machines or in the
driven machine, inadequate alignment of the
machine set, operation of the machine with the
system resonating (system = motor, base frame,
foundation etc.).
• If the motor runs perfectly in terms of its
mechanical operation, switch on any present
cooling devices (separate fan, water cooler or
similar) and continue to monitor the motor for a
while as it idles.
• If it runs perfectly connect a load. Check that it runs
smoothly, and record the values for voltage, current
and power. As far as possible, record the
corresponding values for the working machine as
well.
Warning
The vibration values encountered during
operation must be satisfied in accordance with
IS: 12075: Mechanical vibration of rotating
electrical machines with shaft heights 56mm
and higher – Measurement, Evaluation and
Limits of Vibration severity, as otherwise the
motor could be damaged.
• Monitor and document the temperatures of the
bearings, windings etc. until the system reaches a
steady state, in as much as this is possible with the
available measuring equipment.
4.5 De-energizing
Measures during de-energizing
Anti condensation heaters if present should be
switched on automatically when the motor is de-
energized.
If the corresponding control action does not take place
automatically, switch on the anti-condensation
heating if present.
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