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• Use an RCD circuit breaker with high leakage current due to the high capacitive leakage
currents. The leakage current basically depends on the type, length and laying of the
motor cable.
– Use at least a 500 mA RCD circuit breaker for converter outputs up to approx. 100 kW.
– Use at least a 1 A RCD circuit breaker for converter outputs above 100 kW.
– The RCD circuit breakers used must be of the "sensitive to all current types" or "pulse
6.5.4
Connecting mains power cable to the inverter
You do not need any N conductor.
Procedure
• Only connect the converter using a permanently installed connecting cable. The
conductor cross-sections for cabinet units can be found in the technical data provided in
the converter documentation.
• Observe the switch manufacturer instructions when connecting cables directly at the main
switch. These instructions are provided in the circuit diagram pocket in the converter
cabinet. If necessary, special equipment cable lugs must be used in order to be able to
utilize the connection spaces available.
• Connect the line feeder cable L1-L2-L3 to terminals U1, V1, W1 of terminal strip -X1 of the
converter: Refer to the technical data for the correct tightening torques for the power
cable connection.
Installation and Operating Instructions for LOHER DYNAVERT I Series 7
Operating Instructions, 10/2022, 4BS0745-002
current sensitive" type with this label:
NOTICE
Destruction due to nonsymmetrical current distribution
In the case of converters with higher pulse numbers, the rectifier can be destroyed as a
result of the non-symmetrical current distribution.
Pay attention to symmetrical current distribution.
• Use the same cable types and lengths as well as the same connection technology for
every line connection.
• Route all cables on the same or a comparable route so that the cable temperatures
are the same.
Electrical connection
6.5 Line supply connection
65
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