Indicators and controls
Apart from the jumpers, the indicators and controls of the power
supply unit are fitted on the front plate. The following figure shows
their locations:
The labelling and purpose of the indicators and controls are given in
the following table:
ID Label
Element
Purpose
A
Voltage
selector
1)
Switch
Voltage selector switch:
choice of 120 V or 230 V
B
Power
Switch
Standby On/Off switch (not
system On/Off switch)
C
Voltage low
Red LED
Low voltage at load voltage
monitor input
D
Fan 1
Red LED
Failure of Fan 1
E
Fan 2
Red LED
Failure of Fan 2
F
Fan 3
Red LED
Failure of Fan 3
G
Alarm
Red LED
Indicates failure of at least two
fans; if jumper is set accordingly,
output enable is the second signal
source.
H
MB low
Yellow
LED
Lithium battery/external battery
voltage below preset limit (3 V)
I
RB low
Yellow
LED
Rechargeable battery voltage
below preset limit (3 V)
J
Reset
Batt.+Fan
Pushbutton Reset of LEDs D, E, F, G, H, I
when fault cleared
K
5V o.k.
Green
LED
Lights up to indicate output
voltage within permissible range
L
15V o.k.
Green
LED
Lights up to indicate output
voltage within permissible range
M
24V o.k.
Green
LED
Lights up to indicate output
voltage within permissible range
1)
Only on the 6ES5 955-3LC41 and 6ES5 955-3LF41
I
6ES5955-3LF41
L1 N
1
D
E
F
G
H
K
L
M
2
3
4
1
1
1
2
2
2
3
3
3
5
6
7
8
9 10
11
14
12
15
13
16
17 18
+
+
+
-
-
-
AC 120V 4,5A
AC 230V 2,6A
CAUTION!
Disconnect
before
removing
power supply!
Voltage
selector
Unlock
fan
Unlock
fan
Unlock
fan
Input
DC 24V Ext.
Output
DC 24V 2,8A
AC line 50/60 Hz
Enable
Power supply
Voltage Monitor
Fan
Battery
DC 5/15/24V
Internal
Ext.Batt.
DC 4,5V
Fault
Fan Warning
Fan Alarm
Warning
max.AC 250V/3A
max. AC 250V/3A
Fa
n
1
MB
low
Fa
n
2
RB
low
5V
o.k
.
Fa
n
3
15V
o.k
.
24V
o.k
.
Al
arm
EN UH
Power
I
O
1
2
3
4
5
6
7
8
9
1
0
Batt. 3,6V/5Ah
Replace by
trained personnel
only!
SIEMENS
A
C
V
o
ltage
low
J
Batt.
+
F
an
Re
se
t
3V=40A
B
4
Power Supply Units
System Manual
C79000-B8576-C199-03
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