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Wiring system
Avoid short circuit the output cable and the drive enclosure, otherwise there is the
risk of electric shock.
It is forbidden to connect the output terminals of the drive to the capacitor or LC/RC
noise filter with phase lead, otherwise, the internal components of the drive may be
damaged.
When contactor is installed between the drive and the motor, it is forbidden to
switch on/off the output contactor during the running of the drive; otherwise, there
will be large current flowing into the drive, triggering the drive protection action.
Length of cable between the drive and motor
If the cable between the drive and the motor is too long, the higher order harmonic
leakage current will cause impact on the drive and the peripheral devices. It is
suggested that output AC reactor be installed when the motor cable is longer than
100m, and that carrier frequency be set as follows:
Cable length
between drive and
motor
Carrier frequency
(F0.15)
3.4.1 Grounding Wiring
The drive will produce leakage current. The higher the carrier frequency is, the larger
the leakage current will be. The leakage current of the drive system is more than
3.5mA, and the exact value of the leakage current is determined by the site
conditions. To ensure the safety, the driver and the motor must be grounded.
The grounding resistance shall be less than 10ohm. For the grounding wire diameter
requirement, refer to 8.7 Model selection of system Do not share grounding wire
with the welding machine and other power equipment.
3.4.2 Countermeasures against conduction and radiation interference
When the input noise filter is installed, the wire connecting the filter to the drive
power input tenninal shall be as short as possible.
The filter enclosure and mounting cabinet shall be large area reliably grounded to
reduce the back-flow impedance of the noise current Ig.
The wire connecting the drive and the motor shall be as short as possible.
The motor cable adopts 4-core cable, among which the grounding wire shall be one
end grounded at the drive side, the other end connected to the motor enclosure.
SINAMICS V50 converter
7
Operating Instructions, 04/2022, FW V1.0, A5E44777205B AB
Less than 50 m
Less than 10kHz
Less than 100 m
Less than 6kHz
More than 100 m
Less than 4kHz
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