Siemens S5-155U System Manual page 150

Output 2 (bus)
Rated output voltage U
AN2
Rated output current I
AN2
Total current rating 24 V/15 V output
Ripple
Protection and monitoring
Fuse for overcurrent protection
Test sockets for U
A2
- green LED 15 V/24 V o.k. for U
(fuse monitor)
Output 2 (front)
Rated output voltage U
AN4
Rated output current I
AN4
Capacitive load
Protection and monitoring
Overcurrent protection by current limiting I
Test sockets for U
A2
- green LED 24 V o.k. for U
Total current rating of 24 V voltages (bus and
front)
Output 3 with 15 V auxiliary submodule
Rated output voltage U
AN3
Rated output current I
AN3
Ripple
Protection and Monitoring
Overvoltage protection (output is
short-circuited at U )
A3
Undervoltage signal (LED 15 V/24 V o.k.
on front plate goes off at)
Overcurrent protection I
Test socket for U
A3
Fans
Fan type
Input voltage
Flow rate per fan
Fan monitoring
Expected service life of a fan
System Manual
C79000-B8576-C199-03
24 V DC +25 %/-20 %
0.8 A DC
≤ 0.8 A
Input voltage ripple
1.5 A fast, 250 V, 6.3 x 32 mm
on front plate (24 V test)
The LED lights up wenn U
A2
24 V DC +25 %/-24 %
0.4 A DC
< 100 nF
> 0.44 A
A4
on front plate (24 V test)
The LED lights up when U
A4
must not exceed 0.8 A
15 V DC +/-5 %
0.5 A DC
≤ 5 % of U
≥ 18.5 V
≤ 14 V ± 3 %
by current limiting > 0.5 to 1.5 A
A3
on front plate (15 V test)
2 axial fans
24 V DC
160 m
Air flow monitoring with PTC thermistors as sensors;
stoppage of one or both fans is detected and signalled
to the exterior via Fan Fault LED and relay contacts,
and results in shutdown of output voltage (switched
off via jumper F-R).
30,000 to 40,000 h typical at 55
40,000 to 50,000 h typical at 30
6ES5 955-3NA12 Power Supply Unit
> 17.9 to 18.5 V
A2
> 16 V +/-20 %
A4
AN3
3
/h (no-load value)
o
C
o
C
4
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