Residual-current protective device
Only RCDs that are sensitive to universal current (type B or B+) are permissible. Personal
protection is not possible if the device is operated with RCDs, as is also the case for
converters.
When the power supply of the device is switched on, charging current pulses can occur due
to the capacitors. In the integrated EMC lter, this can cause the RCDs to trip instantaneously.
We recommend residual-current operated circuit breakers with a tripping threshold of
300mA and delayed tripping (super-resistant, characteristic K).
Use in IT systems
WARNING
Risk of electric current
In an IT system, the neutral point of the voltage supply is not grounded. If a short-circuit occurs
between a phase (e.g. "L1") and the protective conductor "PE", then the protective conductor
is at phase potential.
Under no circumstances may a voltage higher than the specied line voltage of the device be
applied between the line connection and the protective conductor "PE".
1-phase EC separately driven fans can be used on an IT line system. On 3-phase IT line
systems, follow the bullet points for use During a ground fault of an unused line phase, the
potential relative to "PE" must not be higher than the specied line voltage of the device (at
neither of the two supply connections).
To ensure fault-free operation on the IT line system, connect the "GND" potential of the
control connections to the protective conductor potential.
The following consequences of this connection must be observed for the control connections
(except for relay contacts):
1. Only connect using cables that are suitable for the line voltage and environment.
2. Only connect via suitable buer stages.
9.3.6 Signal connection
DRIVE-CLiQ is the preferred method for connecting the encoder systems to SINAMICS.
Motors with a DRIVE-CLiQ interface can be ordered for this purpose. Motors with a
DRIVE-CLiQ interface can be directly connected to the associated motor module via
the available MOTION-CONNECT DRIVE-CLiQ cables. The MOTION-CONNECT DRIVE-CLiQ
cable is connected to the motor in degree of protection IP67. The DRIVE-CLiQ interface
supplies power to the motor encoder via the integrated 24 VDC supply and transfers the
motor encoder and temperature signals and the electronic type plate data, e.g. a unique
Electrical connection
9.3System integration
1PH8 SIMOTICS M main motors
Conguration Manual, 12/2022, A5E51895839A 253
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