Siemens S5-155U System Manual page 128

Power Supply Units
Protection and monitoring
Voltage monitor
Overvoltage shutdown U
A1
Undervoltage signal U
A1
Current limiting for overload
Test sockets for I on front plate
A1
Signalling section
Green LED: "5 V o.k." for U
Output 2
Rated output voltage U
AN2
Rated output current I
AN2
Total current X2 and front terminals
Ripple
Spikes
Protection and monitoring
Current limiting for overload
Green LED "24V o.k." for U
Output 3
Rated output voltage U
AN3
Rated output current I
AN3
Ripple
Spikes
Protection and monitoring
Overvoltage shutdown U
A1
Current limiting for overload
Green LED "15V o.k." for U
4 - 58
6ES5 955-3NC41
Monitors voltage for
<14V and >16V
6V ± 5%
4.75V + 3%
1.0 to 1.2 I
AN1
(3V = 18A)
Signals for SIMATIC S5,
relays: "Fan Warning,
Fan Alarm, Warning" 250V/3A
LED lights up if
A1
4.75V < U
A1
24 V DC (+25 %, -12.5 %)
1 A DC
1 A max.
≤ 1% of U
A2
≤ 2% of U
A2
1 to 1.3 I
AN2
LED lights up if
A2
U >19.9 V to 21.1 V
A2
15 V DC (± 5 %)
0.5 A DC
≤ 1 % of U
A3
≤ 3% of U
A2
17V ± 5%
1 to 1.5 I
AN3
LED lights up if
A3
14.2 to 14.7 V < U
to 17.9 V
6ES5 955-3NF41
Monitors voltage for
< 14V and > 16V
6V ± 5%
4.75 V + 3%
1.0 to 1.2 I
AN1
(3V = 40A)
Signals for SIMATIC S5,
relays: "Fan Warning,
Fan Alarm, Warning" 250V/3A
LED lights up if
4.75V < U
A1
24 V DC (+ 25%, -12.5%)
2.8 A DC
2.8 A max.
≤ 1% of U
A2
≤ 2% of U
A2
1 to 1.3 I
AN2
LED lights up if
U > 19.9 V to 21.1 V
A2
15 V DC (± 5 %)
2 A DC
≤ 1% of U
A3
≤ 3% of U
A2
17V ± 5%
1 to 1.5 I
AN3
LED lights up if
< 16.1 14.2 to 14.7 V < U
A3
17.9 V
C79000-B8576-C199-03
< 16.1 to
A3
System Manual