Dc Power Supply - Siemens SIMATIC Rack PC 840 Manual

7.9

DC Power Supply

Output Voltages
+ 12 V
– 12 V
+ 5 V
– 5 V
+ 3.3 V
+ 18 V aux
* The total power comsumption of the +5V and +3.3V voltages may not exceed 160 W.
Power-Good-Signal
Power–Good Signal:
T1:
T2:
T3:
Figure 7-13 Time Characteristics of the Power Good Signal
SIMATIC Rack PC 840 Manual
A5E00104826-03
Voltage
8 A
0.5 A
30 A
0.5 A
20 A
0.08 A
T1
preset time 100 ... 500 ms
hold-up time Not specified
save time 1 ms mimimum
Max. Current
" 4 %
" 6 %
" 3 %
" 5 %
" 5 %
" 5 %
T2 T3
Hardware Information
Voltage Stability
Input voltage
+5 V secondary
voltage
POWER GOOD
7-35