5. Electronics
Figure 5-7. Isolation Power Transformer Options
• +24 VDC Unregulated Power Supply (+29.5 +/- 3 VDC)
This power supply rectifies and filters the 21 VAC from the
Isolation Power Transformer into unregulated nominal +24
VDC. The expected voltage reading from this power supply is
+29.5 ± 3 VDC. This board has a 10 amp 250 VAC fuse, and
an LED that turns on to indicate that power is being applied to
the Power Supply.
The unregulated power supply provides power directly to the
following boards, see Figure 5-8.
o Blood Pump Power Board
o UF-Proportioning Power Board
o I/O Electronics Power Board
o I/O Hydraulics Power Board
o Peripheral Interface Board
o Optional HDF Board
These boards, in turn, selectively feed this unregulated nominal
+24 VDC to motors, valves, and pumps.
157-1278-912 Rev A 5-11
November 2003
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