Siemens S5-135U/155U - Manual (Page 96)

4-30
System Manual
C79000-G8576-C199-06
!
Caution
For safety reasons, the power supply unit may only be operated in the
housing provided for the purpose.
The protective conductor must always be connected.
After carrying out setting, installation and repair work, proceed according to
the following steps to refit the power supply unit in the frame:
Step Action
1 Push the PSU into the guide rails until it locks in place. You can use one
hand to support the PSU from below; this facilitates fitting in the guide
rails.
2 Secure the PSU with the fixing screws on the left and right of the unit.
!
Caution
Since the fixing screws also provide the protective conductor connection to
the subrack, they must be tightened before the power cable is connected.
Wiring of the PSU is carried out within the scope of overall wiring for your
controller, according to your requirements and the section entitled
“Establishing the settings and cabling.”
Terminals with dangerous touch-voltages must be covered with caps. Use
only the original self-tapping screws provided when you fit the caps for the
first time.
Fitting the Power
Supply Unit
How to Fit the PSU
Wiring the Power
Supply Unit
How to Wire
the PSU
Central Controllers and Expansion Units Power Supply Units