Connection On The Output Side - Siemens SITOP PSU8600 Manual

6.2

Connection on the output side

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 switched off after a specified characteristic has been exceeded (see Chapter
"Technical data (Page 383)").
The load circuits to be supplied are connected using the "OUTPUT" terminal 1 of the basic
unit 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 unit. 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 "GROUND" 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 unit to avoid overloading the wiring.
Terminal "GROUND" at the expansion modules is only used to connect the ground for
larger system configurations, see Chapter "Establishing an additional ground connection
(Page 159)".
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 unit to a suitable connection point of the protective conductor system (PE) of the
overall plant or system.
Additional information is provided in Chapter "Connections and terminal designations
(Page 32)".
Power supply system SITOP PSU8600
Manual, 09.2018, A5E36758446-5-76
6.2 Connection on the output side
Installation
155