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7.8
Power Supply (DC)
Technical Specifications
Input voltage
Power consumption
Jumpering on power failure
Maximum continual power output
Degree of protection
Protection class
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 140 W.
Power-Good-Signal
Power–Good Signal:
T1:
T2:
T3:
Figure 7-13 Time Characteristics of the Power Good Signal
SIMATIC Box PC 840 Manual
A5E00085984-04
Voltage
4.4 A
0.5 A
22 A
0.5 A
16 A
0.08 A
T1
preset time
100 ... 500 ms
hold-up time
not specified
save time
1 ms mimimum
24 V DC (20.4 – 28.8 V DC)
v 265 Watt
1 ms at nominal voltage
180 W
IP20 (when fitted)
VDE 0106
Max. Current
" 4 %
" 6 %
" 3 %
" 5 %
" 5 %
" 5 %
T2
T3
Hardware Information
Voltage Stability
Input voltage
+5 V secondary
voltage
POWER GOOD
7-37
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