Siemens S5-135U/155U - Manual (Page 124)

4-58
System Manual
C79000-G8576-C199-06
The following indicators and controls are arranged on the front plate:
1 2 3 4 5 6 7 8 9 10
DC Line Monitor Output
24V DC
+ -
L+ M
Disconnect
before removing
power supply!
ID Label Element Purpose
1 Fan Fault Red LED 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).
2 Batt. Low Yellow
LED 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.”
3 Reset Button 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.
4 Power Supply
o.k. Green
LED The LED lights up when the 5 V output voltage is present.
5 Test 5 V Test socket To measure output voltage V
o/p1
(standard setting: 5.1 V DC
$ 0.5%)
6 3 V = 10 A Test socket To measure output I
o/p1
(3 V = max. output current of the PSU)
linearity range 0.5 V/1.6 A to 3 V/40 A
7 Power Supply
o.k. (Bus) Green
LED 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
8 DC 15V/24V
(Bus) Test
sockets a) To measure output voltage V
o/p2
(24 V DC +25 %/-24 %)
b) To measure output voltage V
o/p3
(15 V DC
$ 5 %, provided that 15 V aux. submodule is fitted)
9 Power Supply
o.k. (terminal) LED The green LED lights up to indicate presence of the output voltage at the “DC
24 V” terminal for the enable supply.
10 Batt. 3.4V/5Ah Battery
drawer 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.
LEDs and Controls
Central Controllers and Expansion Units Power Supply Units