Siemens S5-135U/155U appendix Label Element Purpose

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
	L+ M	before removing
		power supply!
		1	2 3	4	5	6 7 8	9	10
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

3

Batt. Low

Reset

Yellow

LED

Button

The LED lights up if the battery voltage has dropped below 2.7 V; the data stored in the RAM may be lost after ªPower OFF/ON.º

If the PLC is in the ªPower OFFº state, the battery must be replaced after ªPower ONº when the ªBatt. Lowº LED is lit. You must press the Reset button after changing the battery.

4

5

6

Power Supply o.k.

Test 5 V

3 V = 10 A

Green	The LED lights up when the 5 V output voltage is present.
LED
Test socket	To measure output voltage Vo/p1
	(standard setting: 5.1 V DC $ 0.5%)
Test socket	To measure output Io/p1
	(3 V = max. output current of the PSU)
	linearity range 0.5 V/1.6 A to 3 V/40 A

7

8

9

10

Power Supply o.k. (Bus)

DC 15V/24V (Bus)

Power Supply o.k. (terminal)

Batt. 3.4V/5Ah

Green

LED

Test sockets

LED

Battery drawer

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 Vo/p2 (24 V DC +25 %/-24 %)

b)To measure output voltage Vo/p3

(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 ªDC 24 Vº 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.

4-58	System Manual
	C79000-G8576-C199-06