Siemens S5-135U/155U - Manual (Page 123)

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System Manual
C79000-G8576-C199-06
4.4 6ES5 955-3NA12 Power Supply Unit
Your 135U central controller (6ES5 135-3UA41) contains the following
power supply unit (PSU):
Type of PSU
Designation
Input Voltage Output Voltage
6ES5 955-3NA12
(primary/secondary,
non-floating) 24 V DC 5 V/10 A DC
permissible range
0 to 10 A
24 V/0.8 A DC
permissible range
0 to 0.8 A
4.4.1 Technical Description
The power supply unit offers the following functions:
S
System power supply
All system voltages needed to operate the CC are supplied. The 15 V
supply needed to operate the SINEC H1 system can be incorporated in the
power supply unit by fitting an auxiliary submodule.
S
Data backup
A lithium battery ensures data backup when power is switched off or
fails.
S
Heat dissipation
The power dissipation is removed by fans.
Central Controllers and Expansion Units Power Supply Units