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Siemens S5-135U/155U User Manual

Page 125

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4-59

System Manual
C79000-G8576-C199-06

1 2

2

2

2

3

4

5

6

7

DC Line

Monitor Output

24V DC
+ -

L+M

Disconnect
before removing
power supply!

ID

Label

Element

Purpose

1

Protective conductor terminal for PSU module and housing.

2

Strain reliefs for connecting cables, with metal contact surface for cable
shields.

3

DC Line

Screw
terminals

System connection, 24 V input voltage

4

Monitor Output

Relay
output

Standstill of one or both fans is signaled via LED and relay contact, and
results in shutdown of output voltages (can be shut down via jumper F-R of
the PSU; then only relay signal and LED indication).

5

Enable Power
supply

Input/
output

No voltage at the EN input results in shutdown of the PSU. Not more than
7 EN inputs may be driven with one U

H

output (front terminal).

6

DC 24 V; 0.4 A

Output

This output can be used to power the enable inputs of the U Periphery.

7

Ext.Batt. 3.4 V

Sockets

Sockets for external 3.4 V backup voltage.

!

Caution

Observe the appropriate VDE specifications, especially VDE 0100. The
terminals at the front are suitable for a conductor cross-section of up to
4 mm

2

, solid, or 2.5 mm

2

, flexible. Ensure adequate strain relief of the

connections.

You can add a 15 V auxiliary submodule to the 6ES5 955-3NA12 power
supply unit (for example, if you wish to use SINEC H1). The auxiliary
submodule produces a stabilized 15 V output voltage from the 24 V output
voltage. The auxiliary submodule is short-circuit protected. The output
voltage is monitored. If the voltage is too low, the green “15/24 V o.k.” LED
on the front plate goes off. If the voltage is too high, the output is
short-circuited by a thyristor.

Terminals

15 V Auxiliary
Submodule

Central Controllers and Expansion Units Power Supply Units