Technical data • Entire device
Section 2
Technical data
89Automation PC 620 with 945GME N270 CPU board User's Manual V 1.10
2.9 Power management APC620 system unit with 3 PCI slots
2.9.1 5PC600.SF03-00 supply voltage
The following block diagram presents the simplified structure of the APC620 supply voltage for
system units 5PC600.SF03-00.
Explanation:
Systems with 3 PCI slots have an additional power supply for the PCI buses and the slide-in
drive. The supply voltage is converted to 15 V with a DC/DC converter. These electrically
isolated 15 volts feed two further DC/DC converters. One generates 5 V for an additional DC/DC
converter, which produces +12 V and +12V PCI bus voltage. The other DC/DC converter
produces 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.
The optional APC620 add-on UPS and battery unit is supplied with 15 V and provides an
uninterrupted power supply from the 15 V bus during power failures.
Figure 29: Supply voltage block diagram 3 PCI slots
24V
15V
Supply voltage
+24 VDC
Buffering capacitors
(for at least 10 ms)
3V3 Standby
3V3
3V3
5V
15V
+12V
+12V
5V
15V
Power On
5V
5V Standby
electrically
isolated
3V3 PCI bus
3V3
5V PCI bus and slide-in
+12V PCI bus
5V
5V
15V
-12V
-12V PCI bus
PCI bus and slide-in power supply
UPS battery
Add-on UPS
module (optional)
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