Measures To Be Taken Prior To Commissioning; Monitoring The Temperature Of The Stator Winding; Energizing - Siemens 1LA8 Series Operating Instructions Manual

4.2 Measures to be taken prior to
commissioning
Overview
After assembling the motor in line with technical
requirements and before commissioning the system,
check that:
• The motor has been assembled and aligned
properly.
• The motor is connected up corresponding to the
specified direction of rotation.
• The operating conditions are in accordance with
the data specified on the nameplate.
• The bearings have been regreased (depending on
the version). Rolling-contact bearing motors which
have been in storage for more than 2 years must be
regreased.
• Any supplementary motor monitoring devices and
equipment have been correctly connected and are
functioning.
• Appropriately configured control functions and
speed monitoring equipment ensure that speeds
higher than the permissible speeds stated on the
rating plate do not arise.
• The power take-off elements have the correct
parameters for their type (e.g. alignment and
balancing of couplings, belt tension of a belt drive,
backlash and crest clearance of a gear PTO drive,
radial clearance).
• The minimum insulation resistance values and the
minimum air gap values are satisfied.
• The earthing and equipotential grounding
connections have been correctly made.
• Any bearing insulation, which may be present, has
not been bridged.
• All retaining bolts, connecting elements and
electrical connections have been tightened to the
specified torque.
• The rotor can be spun without coming into contact
with the stator.
• All shock-protection and guard measures for
moving and live parts have been taken.
• If the second end of the shaft is unused, its key has
been secured so that it cannot be thrown out and
the open shaft end is covered.
• All separately driven fans fitted are ready for
operation and have been connected such that they
rotate in the direction specified.
• The flow of cooling air is not impeded.
• Brakes (if fitted) function perfectly.
• The indicated speed limit nmax cannot be exceeded
during operation with a converter.
Note
The maximum speed n
max
speed permitted for short periods. It should be kept in
mind that motor noise and vibration are worse at this
speed, and bearing life is reduced. (For details refer
catalogue or contact nearest Siemens office).
Caution
After motor installation, the brake, if fitted,
should be checked for proper functioning.
If the design of the motor requires that the converter is
assigned in a particular way, the rating plate will
contain corresponding additional information.
Warning
This list does not claim to be exhaustive. It may
be necessary to make additional checks and
tests corresponding to the actual plant/system
situation.
4.3 Monitoring the temperature of the
stator winding
Measures
In addition to the current-dependent overload
protection device located in the connecting leads, we
recommend that you also monitor the temperature
rise in the motor with the aid of the temperature
sensors embedded in the stator winding.

4.4 Energizing

Measures during commissioning
The following measures are normally recommended
after installation or inspection work for standard
commissioning of the motors:
• Start up the motor without a load; to do this, close
the power switch and preferably do not switch it
off prematurely. Switching the motor back off again
while it is starting up and still running at slow
speed should be kept to a bare minimum, for
example for checking the direction of rotation or for
checking the operation of the motor. Allow the
machine to run to a standstill before switching it
back on again.
• Check the mechanical operation for noises and
vibrations at the bearings and bearing end shields.
• If the motor does not run smoothly and/or there are
any abnormal noises, switch it off and determine
the cause as it slows down.
is the highest operating
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