Indicators And Controls - Siemens S5-155U System Manual

6ES5 955-3NA12 Power Supply Unit

Indicators and controls

DC Line
Monitor Output
24V DC
+ -
Disconnect
before removing
power supply!
L+ M
ID Label Element
1 Fan Fault Red LED
2 Batt. Low Yellow
LED
3 Reset Button
4 Power Supply Green
o.k. LED
5 Test 5 V Test socket To measure output voltage U
3 V = 10 A
6 Test socket To measure output I
7 Power Supply Green
o.k. (Bus) LED
8 DC 15V/24V Test
(Bus) sockets
9 Power Supply LED
o.k. (terminal)
10 Batt. 3.4V/5Ah Battery
drawer
4 - 70
The following indicators and controls are arranged on the front plate:
Enable
Battery
Internal 5V/15V/24V DC
Power supply
2 3
1
Purpose
The LED lights up to indicate a fan fault. The PSU then switches off
(jumper F-R closed). If, for technical reasons, you cannot immediately
switch off the PLC, you must open jumper F-R. However, switch off
the PLC after 60 s at the latest (overheating of modules).
The LED lights up if the battery voltage has dropped below 2.7 V; the
data stored in the RAM may be lost after "Power OFF/ON".
If the PLC is in the "Power OFF" state, the battery must be replaced
after "Power ON" when the "Batt. Low" LED is lit. You must press
the Reset button after changing the battery.
The LED lights up when the 5 V output voltage is present.
(standard setting: 5.1 V DC ± 0.5%)
A1
(3 V = max. output current of the PSU),
linearity range 0.5 V/1.6 A to 3 V/40 A
The LED lights up to indicate presence of the 15 V output voltage (if
the 15 V auxiliary submodule is fitted) and 24 V output voltage
a) To measure output voltage U
b) To measure output voltage U
15 V aux. submodule is fitted)
The green LED lights up to indicate presence of the output voltage at
the "DC 24 V" terminal for the enable supply.
The backup battery is arranged so that it can be replaced during
operation and the PSU can be replaced during battery backup without
the backup voltage being interrupted.
15V/24V
5V DC 24V DC 0,4A
DC
4 5 6 7 8
9
A1
(24 V DC +25 %/-24 %)
A2
(15 V DC ± 5 %, provided that
A3
C79000-B8576-C199-03
10
System Manual