Wiring Power Modules - Siemens Sinamics G120 CU240E Operating Instructions Manual

3.3.2

Wiring Power Modules

Prerequisites
Once the Power Module has been properly installed, the line and motor connections can
now be established. The following warning information must be observed here.
Line and motor connections
The inverter must be grounded on the supply and motor side. If this is not carried out
properly, this can lead to extremely hazardous conditions which, under certain
circumstances, can result in death.
The device must be disconnected from the electrical power supply before any connections
with the device are established or in any way altered.
The inverter terminals can carry hazardous voltages even after the inverter has been
switched off. After disconnecting the line supply, wait at least 5 minutes until the drive unit
has discharged itself. Only then, carry out any installation and mounting work.
When connecting the frequency inverter to the line supply, ensure that the motor terminal
box is closed.
Even if the LEDs or other indicators do not light up or remain inactive when a function is
switched from ON to OFF, this does not necessarily mean that the unit has been switched
off or is de-energized.
The short-circuit ratio of the power supply must be at least 100.
Make sure that the inverter is configured for the correct supply voltage (the inverter must
not be connected to a higher supply voltage).
If a residual-current circuit breaker is installed on the supply side of the electronic devices
to protect against direct or indirect contact, only type B is permissible. In all other cases,
other protective measures must be implemented, such as creating a barrier between the
electronic devices and the environment by means of double or reinforced insulation, or
disconnecting them from the supply by means of a transformer.
CAUTION
Supply and control cables
The control cables must be laid separately from the supply cables to ensure that the system
is not affected by inductive or capacitive interference.
Note
Electrical protective equipment
Make sure that suitable circuit breakers and/or fuses (with the prescribed rated currents) are
installed between the supply system and inverter (see the technical specifications).
Frequency inverter
Operating Instructions, 08.10. 2008, t.b.d.
WARNING
Connection
3.3 Mounting Power Modules
35