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Siemens S5-135U/155U User Manual

Page 93

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4-27

System Manual
C79000-G8576-C199-06

The following applies to input EN (Enable Power Supply):

S

Input EN monitors the voltage for < 3.6 V; it enables the output voltage at
3.2 V.

S

If two or more units are to be controlled jointly, connect input EN of the
PSU in the central controller to the EN inputs of the PSUs in the
expansion unit. Connect the auxiliary voltage U

H

, for example, to these

inputs. In the event of failure of the PSU in the central controller, all units
will then be switched off with the appropriate jumper settings.

Not more than 7 EN inputs may be connected to one U

H

output (front

terminal).

The following applies to selecting the cables for the terminals:

Terminals

Cabling

Max. Permissible Conductor Cross-Sections

Power supply

AC line

DC line

Phase

L 1

Neutral

N

Protective cond.

PE

Positive

L +

Chassis 0 V

M

Protective cond.

PE

4 mm

2

solid or 2.5 mm

2

flexible

4 mm

2

solid or 2.5 mm

2

flexible

4 mm

2

solid or 2.5 mm

2

flexible

4 mm

2

solid or 2.5 mm

2

flexible

4 mm

2

solid or 2.5 mm

2

flexible

4 mm

2

solid or 2.5 mm

2

flexible

Load voltage input (Voltage
monitor, Ext. 24 V DC)

24 V input (may be omitted if jumper
BA-EX is closed)

4 mm

2

solid or 2.5 mm

2

flexible

Enable power supply

Set jumper from EN-U

H

or apply

w 3.2 V voltage at EN, with respect
to output chassis ground

4 mm

2

solid or 2.5 mm

2

flexible

Relay terminals, also
suitable to 230 V AC / 3 A

4 mm

2

solid or 2.5 mm

2

flexible

Monitor output for 24 V

4 mm

2

solid or 2.5 mm

2

flexible

Note

A voltage of more than 50 V must not develop between the output voltages
and the protective conductor potential.

Setting up the
Control Input for
the Power Supply

Establishing the
Cables

Central Controllers and Expansion Units Power Supply Units