B&R Industries Automation PC 620, User Manual

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Technical data • Entire device
Chapter 2
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Te
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59 Automation PC 620 User's Manual V 1.90
2.6 Power management for APC620 systems with 1 and 2 PCI slots
The following block diagram presents the simplified structure of the APC620 supply voltage for
system units 5PC600.SX01-00, 5PC600.SX02-00 and 5PC600.SX02-01.
Explanation:
The supply voltage is converted to 15 V with DC/DC converter. These electrically isolated 15 V
feed two further DC/DC converters. One gen12 V, and the other 3V3 and 5V standby.
After the system is turned on (e.g. using the power button), the voltages 3V3, 5 V, +12 V are
placed on the bus. At the 5 V output, yet another DC/DC converter generates -12 V , and places
these on the bus.
Figure 17: Supply voltage block diagram 1 and 2 PCI slots
24V 15V
Supply voltage
+24 VDC
Buffering capacitors
(for min. 10 ms)
3V3 Standby
3V3
3V3
5V
15V
+12V
+12V
5V
5V
15V
Power On
15V
-12V
-12V
5V Standby
electrically
isolated