Connection
6.2 Electrical connection
1FT7 synchronous motors
Operating Instructions, 04/2010, 610.40075.40b
31
6.2.3 Motor connection
DANGER
Warning regarding motor damage!
The motor will be destroyed if it is directly connected to the three-phase line supply.
Only operate the motors with the appropriately engineered converters!
Ensure the correct phase sequence is used!
Encoder systems and temperature sensors are electrostatic sensitive devices (ESD). Do
not touch the connections with either hands or tools that could be electrostatically charged!
● We recommend that SIEMENS prefabricated cables are used (not included in the scope
of delivery). These cables reduce installation costs and increase operational reliability
(see the Configuration Manual).
● The manufacturer of the plant/machine is responsible for the ensuring that the installation
is performed correctly.
● Observe the data on the rating plate (type plate) and the circuit diagrams.
● Adapt the connecting cables in accordance with the type of use and the voltages and
currents that arise.
● When fed from a converter, high-frequency current and voltage oscillations in the motor
feeder cables can cause electromagnetic interference. Use shielded power cables and
signal lines. Carefully observe the EMC information of the converter manufacturer.
● Make sure that the inside of the connector is clean and free of cable cuttings and
moisture.
● Avoid protruding cable ends.
● Check seals and sealing surfaces of the connectors to ensure that the degree of
protection is maintained.
● Take measures to ensure that connecting cables cannot rotate, are not subject to strain
and pushing forces, and also provide anti-kink protection. It is not permissible to subject
the connector to continuous force.
● The coding groove of the plug-in connection must be inserted so that it is aligned in the
socket connector and the screw cap must be tightened by hand as far as it will go.
CAUTION
High thermal stress
For high thermal stresses, e.g. overload when the motor is stationary, the protective
function with integrated temperature sensor may not be adequate. In these cases, apply
additional protective measures, e.g. i²t monitoring.
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