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Preparing for use
4.14 Converter operation
• Do not exceed or fall below limit speed n
speed limit is n
supplementary plate for converter operation as the highest or lowest specified speed.
• Carefully check that it is guaranteed that the machine is cooled when it is being
commissioned.
4.14.2
Converter input voltage
The insulation system of SIMOTICS LV 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 (Page 12).
• For a line supply voltage (converter input voltage) up to max. 480 V, and when controlled
from a SINAMICS 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 have an appropriate
insulation system when ordered for converter operation.
• 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.
4.14.3
Reducing bearing currents
To prevent damage due to bearing currents, you must carefully assess the complete system, i.e.
the motor, converter and driven machine.
• In addition to grounding the motors via the solid grounding conductor, use low impedance
grounding in the high frequency range using braided flat copper straps or RF stranded wire
conductors. Connect these conductors through a large contact surface. Solid copper cables
are not suitable for RF grounding because of the skin effect.
• Use symmetrically structured, shielded connecting cables to connect the motor to a
converter. The protective braided shield, comprising many strands, must have a high
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
short.
56
5 Hz. The speed limits are either stamped on the rating plate or the
min
or n
. If no other value is specified, the minimum
min
max
1MB..1/2/3/4 - shaft heights 63 ... 355
Operating Instructions, 11/2023, A5E52779900A
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