Siemens SINAMICS S120 Manual page 24

Fundamental safety instructions
2.1 General safety instructions
Electric shock due to connection to an unsuitable power supply
When equipment is connected to an unsuitable power supply, exposed components may
carry a hazardous voltage that might result in serious injury or death.
• Only use power supplies that provide SELV (Safety Extra Low Voltage) or PELV-
Electric shock due to equipment damage
Improper handling may cause damage to equipment. For damaged devices, hazardous
voltages can be present at the enclosure or at exposed components; if touched, this can
result in death or severe injury.
• Ensure compliance with the limit values specified in the technical data during transport,
• Do not use any damaged devices.
Electric shock due to unconnected cable shield
Hazardous touch voltages can occur through capacitive cross-coupling due to unconnected
cable shields.
• As a minimum, connect cable shields and the cores of power cables that are not used
Arcing when a plug connection is opened during operation
Opening a plug connection when a system is in operation can result in arcing that may
cause serious injury or death.
• Only open plug connections when the equipment is in a voltage-free state, unless it has
Electric shock due to residual charges in power components
Because of the capacitors, a hazardous voltage is present for up to 5 minutes after the
power supply has been switched off. Contact with live parts can result in death or serious
injury.
• Wait for 5 minutes before you check that the unit really is in a no-voltage condition and
22
WARNING
(Protective Extra Low Voltage) output voltages for all connections and terminals of the
electronics modules.
WARNING
storage and operation.
WARNING
(e.g. brake cores) at one end at the grounded housing potential.
WARNING
been explicitly stated that they can be opened in operation.
WARNING
start work.
Air-cooled chassis power units
Equipment Manual, 06/2020, 6SL3097-5AE00-0BP3