Siemens S5-135U/155U System Manual page 124

Central Controllers and Expansion Units Power Supply Units
LEDs and Controls
The following indicators and controls are arranged on the front plate:
DC Line Monitor Output
24V DC
+ -
Disconnect
before removing
L+ M
power supply!
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 V
6 3 V = 10 A 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
4-58
1 2 3 4 5 6 7 8 9
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.
o/p1
(standard setting: 5.1 V DC 0.5%)
o/p1
(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 V
(24 V DC +25 %/-24 %)
b) To measure output voltage V
(15 V DC 5 %, provided that 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.
Purpose
o/p2
o/p3
System Manual
C79000-G8576-C199-06
10