Preparing for use
4.14 Converter operation
1MB..1/2/3/4 - shaft heights 63 ... 355
48 Operating Instructions, 06/2020, A5E44455710A
● Do not exceed the specified maximum speed limit
n
max
. You can either find this on the
rating plate
n
max
or on the supplementary plate for converter operation as the highest
speed.
● Check that the machine is cooled sufficiently for commissioning purposes.
4.14.2 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, contact the Service Center.
● 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.
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.
4.14.3 Reducing bearing currents for converter operation
Taking the following actions will reduce the bearing currents:
● Ensure that the contacts are made over a large area. Solid copper cables are not suitable
for high-frequency grounding because of the skin effect.
● Install the equipotential bonding conductor in parallel with the motor cable, as close as
possible and avoid creating any loops.
Equipotential bonding conductors:
Use equipotential bonding conductors:
● between motor and driven machine
● between motor and converter
● between the terminal box and the RF grounding point at the motor enclosure.
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