Emc-Compliant Connection - Siemens SINAMICS G120 Operating Instructions Manual
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Installing
4.4 Connecting the inverter
Examples for operating the inverter and motor on a 400 V line supply
Assumption: The motor rating plate states 230/400 V Δ/Y.
Case 1: A motor is normally operated between standstill and its rated speed (i.e. a speed
corresponding to the line frequency). In this case, you need to connect the motor in Y.
Operating the motor above its rated speed is only possible in field weakening, i.e. the motor
torque available is reduced above the rated speed.
Case 2: If you want to operate the motor with the "87 Hz characteristic", you need to connect
the motor in Δ.
With the 87 Hz characteristic, the motor's power output increases. The 87 Hz characteristic
is mainly used with geared motors.
4.4.3
EMC-compliant connection
The inverters are designed for operation in industrial environments where high values of
electromagnetic interference are expected. Safe, reliable and disturbance-free operation is
only guaranteed if the devices are professionally installed.
Inverters with degree of protection IP20 must be installed and operated in an enclosed
control cabinet.
Control cabinet design
● All metal parts and components of the control cabinet (side panels, rear panels, roof and
● The PE bar and the EMC shield bar must be connected to the control cabinet frame
● All of the metal enclosures of the devices and supplementary components installed in the
● All of the connections must be implemented so that they are durable. Screw connections
● Coils of contactors, relays, solenoid valves and motor holding brakes must be equipped
36
base plates) must be connected to the control cabinet frame through a good electrical
connection – this is best achieved using the highest possible surface area or a high
number of individual screw connections
through a good electrical connection established through a large surface area.
cabinet – e.g. inverter or line filter – must be connected to the control cabinet frame
through a good electrical connection through the largest possible surface area. The most
favorable design is to mount these devices and supplementary components on a bare
metal mounting plate with good conducting characteristics; this in turn is connected to the
control cabinet frame through a good electrical connection and the largest possible
surface area. It is especially important that they are connected to the PE and EMC shield
bars.
to painted or anodized metal components must either be established using special
contact (serrated) washers that cut through the insulating surface and therefore establish
a metallic conductor contact, or the insulating surface must be removed at the contact
locations.
with interference suppression elements in order to dampen high-frequency radiation
when switching-off (RC elements or varistors with AC coils and free-wheeling diodes or
varistors for DC coils). The protective circuit must be directly connected at the coil.
Operating Instructions, 01/2011, FW 4.4, A5E02999804A AB
SINAMICS G120C Inverter
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