Philips epiq 5 - Page 32

EPIQ 5 & 7 Training Manual
© 2016 Conquest Imaging
24
VPPM Block Diagram
Essential and Non-Essential System Voltages
Voltages
Essential?
Function
VDC_SYS
Yes
Functions as an interim DC voltage.
During AC operation, the voltage is +24
Vdc. During battery operation, the
voltage varies from +21 Vdc to +28.7
Vdc to support Sleep Mode. Provides
input for the ATX power supply to
generate voltages for the motherboard
and peripherals. Also supports the
video monitor.
+12 VDC
Yes
Provides power to the disk drives and
cooling fans. Provides power to other
lower-voltage power supplies on the
motherboard.
+5 VDC
Yes
Provides logic power for the disk
drives. Also, provides 5V_STBY when
working under battery power.
Optional
Batteries
Battery Chargeand
Control
24VDC
Converter
5VSTBY
Converter
ATX
ACInverter
Power
Present
ATX
24V
BATTERY
ACPresent
ACout forperipherals
ACoutforperipheral.
The LEDs on the back of
the VPPM module
indicate:
 AC Power present
 24 V – VDC-SYS ready
 ATX – PC/Digital
voltages ready
 Battery status