Connecting - Siemens SINAMICS G120P Hardware Installation Manual

Connecting

Prerequisites
If the inverter is installed properly, mains and motor connections can be established. It is
urgently requiered to comply with the following notes:
Mains and motor connections
A fixed location, non varying connection is necessary because of a leakage current.
Isolate the mains electrical supply before making or changing connections to the unit.
The terminals of the Inverter can carry dangerous voltages even if the inverter is
inoperative. Wait at least 5 minutes to allow the unit to discharge after switching off the
mains supply before carrying out any installation work.
When connecting the mains supply to the inverter, make sure that the terminal case of the
motor is closed.
When changing from the ON to OFF-state of an operation if an LED or other similar display
is not lit or active; this does not indicate that the unit is switched-off or powered-down.
Ensure that the line voltage corresponds to the inverter input voltage – the inverter must not
be connected to a higher line voltage.
Grounding and Protective earthing conductor current
The inverter must always be grounded. If it is not grounded correctly, extremely dangerous
conditions may arise which could prove potentially fatal.
As the earth leakage for the inverter can be greater than AC 3.5 mA, a fixed earth
connection is required and the minimum size of the protective earth conductor shall comply
with the local safety regulations for high leakage current equipment.
In the case of doubt, use for grounding the same cable cross section as for the power
cable, but at least 2.5 mm
Operation with ungrounded (IT) supplies
Inverters with built-in filters or external filters can only be used in power systems with
grounded starpoint and must not be used with IT or TT supplies.
If the inverter, connected to an IT supply, is required to remain operational if an output
phase is connected to ground, the output reactor must be fitted to prevent overcurrent
tripping or damage to the drive. The probability of overcurrent tripping without output
reactor increases with the size of the IT supply.
Power Module PM230, IP20 / Push through
Hardware Installation Manual, 03/2012, A5E03448282B AA
WARNING
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