Siemens S5-135U/155U User Manual
Page 87
4-21
System Manual
C79000-G8576-C199-06
Based on the example of the 6ES5 955-3LF41 power supply unit, the
following figure shows the arrangement of inputs and outputs on the front
plate of the power supply units:
6ES5955-3LF42
L1
N
1
2
3
4
5
6
7
8
9 10
11
14
12
15
13
16
17 18
+
+
+
+
–
–
–
–
AC120V4,5A
AC230V2,6A
CAUTION!
Disconnect
before
removing
power supply!
Voltage
selector
Unlock
Fan 1
Unlock
Fan2
Unlock
Fan3/Res.Batt
.
Input
DC 24V Ext.
AC line 50/60 Hz
Enable
Power supply
Voltage Monitor
Fan
Battery
Ext.Batt.
DC 4,5V
Fault
Warning
Alarm
Warning
max. AC 250V/3A
max. AC 250 V/ 3A
V
o
ltage low
Fan1
MB low
Fan2
RB low
5V
o.k.
Fan3
Reset
Alarm
EN UH
Power
I
I
1
234
5
6
7
8
9
10
Batt. 3,6V/5Ah
Replace by
trained personnel
only!
Use battery holder
C98100-A1155-B21
only!
SIEMENS
Output
DC 24V 2,8A
DC 5/15/24V
Internal
3V=40A
15V
o.k.
24V
o.k.
Batt.+Fan
The following table provides an overview of the labelling and purpose of the
inputs and outputs:
ID
Label
Element
Purpose
A
AC 120V 4.5A
AC 230V 2.6A
Screw terminals
1, 2, 3
AC connection and protective conductor
B
EN
Screw terminal 4
Enable Power Supply
Control input for power supply
C
U
H
Screw terminal 5
Supply for EN
D
Input
DC 24V Ext.
Screw terminals
6 and 7
Voltage Monitor
Monitors 24 V load voltage for > 16 V
E
Fan Warning
max. 250V/3A
Screw terminals
8, 9, 10 (relay)
Indicates failure of a fan
F
Fan Alarm
max. 250V/3A
Screw terminals
11, 12, 13
(relay)
Indicates failure of at least two fans and
inadequate air flow; if jumper set
accordingly, output enable is the second
signal source
G
Battery
Warning
max. 250V/3A
Screw terminals
14, 15, 16
(relay)
Indicates that lithium battery or
rechargeable battery has dropped below
limit
H
3V = 40A
2 test sockets
Current measurement sockets for test
purposes only; no continuous operation;
linearity range 0.5 V/6.6 A to 3 V/40 A
I
Output
DC 24V 2.8A
Screw terminals
17, 18
Enable voltage for I/O modules
J
Ext.Batt.
DC 4.5V
2 input sockets
Input for an external 4.5 V backup
voltage
Inputs and
Outputs
Central Controllers and Expansion Units Power Supply Units