Central Controllers and Expansion Units Power Supply Units

Fitting the Power Supply Unit

!

How to Fit the PSU

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

 

 

1Push 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 the Power

Supply Unit

How to Wire

Wiring of the PSU is carried out within the scope of overall wiring for your

the PSU

controller, according to your requirements and the section entitled

 

ªEstablishing the settings and cabling.º

 

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.

4-30

System Manual

C79000-G8576-C199-06

Page 96
Image 96
Siemens S5-135U/155U Fitting the Power Supply Unit How to Fit the PSU, Wiring the Power Supply Unit How to Wire, Psu