Fitting The Power Supply Unit; Wiring The Power Supply Unit - Siemens S5-155U System Manual

Fitting the power supply unit

How to fit the PSU

Wiring the power supply unit

How to wire the PSU
System Manual
C79000-B8576-C199-03
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 engages. You
can use one hand to support the PSU from below; this
facilitates fitting in the guide rails.
3 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.
Power Supply Units
4 - 33
4