Siemens SIMOTICS HT Series, Operating Instructions & Installation Instructions

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4.13 Converter operation
4.13.1 Converter input voltage
The insulation system of SIMOTICS machines always complies with the requirements of stress
category C (IVIC C = high stress). If voltage peaks higher than those specified according to
IVIC C can occur, then please contact your Siemens partner:
● For a line supply voltage (converter input voltage) up to max. 480 V, and when controlled
from a SINAMICS G/SINAMICS S converter with uncontrolled/controlled infeed: Comply
with the guidelines for configuring motor and converter.
● For line voltages (converter input voltages) higher than 480 V, motors, which are ordered
for converter operation, have an appropriate insulation system.
● Operation with a converter from another manufacturer: Comply with the permissible voltage
peaks according to IEC 60034-18-41 in accordance with stress category C, dependent on
the particular line voltage (converter input voltage) and the motor insulation system.
NOTICE
Material damage caused by an excessively high supply voltage
The insulation system will be damaged if the supply voltage is too high for the insulation
system. This can completely destroy the machine.
● Comply with the peak voltages as laid down in the guidelines above.
4.13.2 Reducing bearing currents
If you want to prevent damage due to bearing currents, you must take the entire system into
account, i.e., the motor, converter and driven machine. The following measures help to prevent
bearing currents:
● In addition to grounding the motors via the grounding conductor, supplement the RF
grounding with braided flat copper cables or RF stranded conductors. Ensure that contact
is established across the largest possible surface area. Solid copper cables are not suitable
for RF grounding because of the skin effect.
● Use symmetrically constructed, shielded connection cables to connect the motor to a
converter. The cable shielding, made up of as many strands as possible, must have good
electrical conductivity. Braided shields made of copper or aluminum are well suited.
Connect the shielding at both ends on the motor and on the converter. Keep unshielded
cable ends as short as possible.
Preparations for use
4.13 Converter operation
SIMOTICS HT Series HT-direct 1FW4...1......A
Operating Instructions 11/2018
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