Siemens SINAMICS S150 NEMA, Operating Instructions Manual

Page: 86 / 862

Electrical installation
4.7 External supply of the auxiliary incoming supply from a protected supply system
Enclosed Drives
84
Operating Instructions, 12/2018, A5E36652151A
WARNING
Incorrect circuit breaker setting
An incorrect setting can cause unwanted or delayed tripping of the circuit breaker and result
in damage to the cabinet unit and can therefore result in death or severe injury.
• Check the settings described above, and if required, adapt the circuit breaker settings
corresponding to the factory setting.
Diagnostics
Messages output during operation and in the event of faults are described in the Operating
Instructions in the customer DVD supplied with the device.
4.7 External supply of the auxiliary incoming supply from a protected
supply system
Description
An external auxiliary incoming supply is always recommended if communication and closed-
loop control are to be independent of the main supply system. An external auxiliary incoming
supply is particularly recommended for weak supply systems susceptible to temporary
supply dips or failures.
With an external supply independent of the main incoming supply, warnings and fault
messages may still be displayed on the operator panel and internal protection and
monitoring devices if the main incoming supply fails.
WARNING
Dangerous voltage as a result of external auxiliary supply
When the external auxiliary supply is connected, dangerous voltages are present in the
cabinet unit even when the main switch is open. Death or serious injury can result when live
parts are touched.
• Observe the general safety rules when working on the device.
Note
External auxiliary supply for automatic restart
An external auxiliary incoming supply must always be used when the automatic restart
(WEA) function is to be used with integrated EMERGENCY OFF option (N57) or
EMERGENCY STOP option (N59, N60).
Otherwise, the automatic restart function does not work.