Siemens SINAMICS G120 Operations Instructions download pdf (Page 37)

Installing

3.3 Installing the Power Module

Inverter with CU240B-2 and CU240E-2 Control Units

Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB

3.3.4 Connecting the line supply and motor

Preconditions

Once the inverter has been properly installed, the line and motor connections can now be

established. The following warning information must be observed here.

WARNING

Line and motor connections

The inverter must be grounded on the line supply and motor side. If the inverter is not

correctly grounded, 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 be at hazardous voltages even after the inverter has been switched

off. After disconnecting the line supply, wait at least 5 minutes until the device has

discharged itself. Only then, carry out any installation and mounting work.

When connecting the inverter to the line supply, ensure that the motor terminal box is

closed.

Even if the LED 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

isolating them from the supply using a transformer.

CAUTION

Supply cable and signal lines

The signal lines must be routed separately from the supply cables to ensure that the

system is not affected by inductive or capacitive interference.

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Siemens SINAMICS G120 Operations Instructions Page 37