Output-Side Connection - Siemens SITOP PSU8600 Manual

6.2

Output-side connection

The SITOP PSU8600 power supply system provides a floating (= ungrounded) SELV output
voltage (Safety Extra Low Voltage) with common ground at the outputs. The system outputs
are no-load, overload and short-circuit proof. If an overload occurs, the electronic current
limiting function limits the current of each output to a maximum value. The output is
electronically shutdown after a specified characteristic has been exceeded (see Chapter
Technical data (Page 227)).
The load circuits to be supplied are connected using the "OUTPUT" terminals 1 to 4 of the
basic device and possibly the expansion modules. Ensure that the output cables are
dimensioned correctly for the maximum output current and are appropriately protected/fused.
The 0 V potential of all load circuits should be fed back from a common collection point of the
system (for example, the 0 V rail) to terminal "0V" of the basic device. Ensure that the cable
between the system collection point and the "0V" terminal is dimensioned to be able to
conduct the total current.
NOTICE
Overload of the wiring
When using expansion modules, it is not permissible that terminal "GND" at the expansion
module is used for the 0 V potential of the loads to be supplied. All 0 V potentials must be
jointly routed to terminal "0V" of the basic device to avoid overloading the wiring.
Terminal "GND" at the expansion modules is only used to connect the ground for larger
system configurations (see Section Establishing an additional ground connection
(Page 114)).
Note
If the safety concept of the system specifies that the DC output circuit should be grounded
(PELV), then the output voltage of the SITOP PSU8600 power supply system may be
grounded.
Ideally, the grounding at the output should be directly connected from terminal "0V" of the
basic device to a suitable connection point of the protective conductor system (PE) of the
overall plant or system.
Also observe the information in Section Connections and terminal designations (Page 21).
PSU8600power supply systems
Manual, 04.2016, A5E35883207-7-76
Installation
6.2 Output-side connection
109