Siemens SINAMICS G120, Installation Manual

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Connecting
Power Module PM240-2
44
Hardware Installation Manual, 01/2020, A5E33294624B AL
WARNING
Fire or electric shock due to unsuitable residual-current protective devices
The converter may create a current through the protective conductor. The current through
the protective conductor can cause the residual current device (RCD) or residual current
monitor (RCM) to incorrectly trip (nuisance trip). In the case of a ground fault, the fault
current can contain a DC component, which prevents the RCD or RCM from tripping, with
the risk of subsequent fire or electric shock.
• Use the protection and monitoring devices recommended in the documentation.
CAUTION
Burns due to touching hot surfaces
Certain components (e.g. the heat sink or line reactor) can become very hot during
operation. The components can remain hot for some time after operation. Touching hot
surfaces can cause burns to the skin.
• Do not touch hot components during operation or immediately following operation.
Protection and monitoring equipment
To provide protection against short-circuit, use the overcurrent devices listed in Technical
data (fuses, circuit breakers etc.).
If the earth fault loop impedance of the line supply at the infeed point is too high to ensure
that the overcurrent protective device disconnects within the stipulated time in the case of
insulation failure (ground fault, fault to frame), then you must use additional residual current
protective devices RCD, type B.
In order that an RCD does not unnecessarily trip as a result of operational leakage currents,
the following preconditions must be fulfilled:
● The neutral point of the line supply is grounded.
● For converters with rated input currents ≤ 80 A referred to LO, use a Siemens
SIQUENCE RCCB (series 5SV364.-4), type B, short-time delayed [K] with a rated
residual current of 300 mA. Connect the RCCB in series with the overcurrent protective
devices.
● For converters with rated input currents ≤ 160 A referred to LO, use a Siemens residual
current device RCD520B (3VA9113-0RL21) mounted onto a Siemens molded case circuit
breaker (series 3VA1).
Recommended settings:
–
Response characteristic B
– Residual current trip level 300 mA
– Response delay ≥ 0.06 s