Manual for Induction Motors and Generators
Commissioning and Start-up -
45
3BFP 000 050 R0101 REV E
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Check that the power cables are suitably routed
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Check that the power cables are stress-relieved in a proper way
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Check the connections of the auxiliary equipment.
NOTE: If the machine is delivered without a main terminal box, see
***Following note for protection type: All machines for hazardous areas
NOTE: If an anti-condensation heater, without self-regulation, is turned on immediately after
the motor is shut down, take suitable measures to control the inside motor housing
temperature. The anti-condensation heaters can only operate within a temperature-
controlled environment.
5.5 Control and protection equipment
5.5.1 General
The machine is equipped with temperature detectors to be connected to a temperature
monitoring and protection system. The location and type, as well as the settings for these
detectors, can be found on the dimensional drawing, and the connection diagram of the
machine.
The temperature alarm level for resistance temperature detectors (RTD, Pt-100) should be set as
low as possible. The level can be determined based on the test results, or the noticed operating
temperature. The temperature alarm can be set 10K (20°F) higher than the operating
temperature of the machine during maximal load at highest ambient temperature.
If a two-function temperature monitoring system is used, the lower level is normally used as an
alarm level and the higher as a trip level.
NOTE: In case the machine trips, the reason must be found and eliminated before the machine
is restarted. In case of an alarm, find the reason and correct the situation. Use the
trouble shooting guide, see
.
***Following note for rotor type: Permanent magnet rotor
NOTE: Permanent magnet synchronous machines are equipped with Pt100 resistance elements
and/or thermistors. The use of these protective elements is mandatory to avoid the risk
of overloading the machine.
5.5.2 Stator winding temperature
5.5.2.1 General
The stator windings are manufactured according to temperature rise class F, which has a
temperature limit of 155°C (300°F). A high temperature will age the insulation and shorten the
lifetime of the winding. Therefore, thorough consideration should be made when deciding the
temperature trip and alarm levels for the winding.
