Pss Board; Input Range; Dc Supply - Respironics BiPAP Vision Service Manual

3.1 PSS Board

AC input (J1)
On/off
switch (J7)
AC power
indicator (J5)
Circulation fan
(J6) (J4)*
* For fans with older style 2-pin connector. Note that cur-
rent version of PSS board still includes the J4 header.
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The PSS board (Figure 3-3) supplies the MC, PC, and DC boards with the
correct DC supply voltage. Safety features designed into the circuitry include
an overvoltage disconnect, low voltage supply detect, and line loss detect.
Other features include power on indicator voltage, circulation fan power, and
an on/off switch connection.
PSS
operating
circuitry
3.1.1

Input Range

The BiPAP Vision can operate with an input of 100, 120, 230, or 240 VAC
(±10%) depending on the model.
3.1.2

DC Supply

The output DC supply is fused at 30 amps (A) and delivers between 20.6 VDC
and 35 VDC with a maximum ripple of 1 Vpp (peak-to-peak voltage) to the MC,
PC, and DC boards.
BiPAP Vision Service Manual © Respironics, Inc.
Circulation fan current
sense (J8 HW),
PC (J12)
Overvoltage
disconnect
Low
bulksupply
detect
Line loss
detect
Figure 3-3: PSS Block Diagram
Chapter 3
Theory of Operation
Bulksupply (J2) to
MC, DS, PC
HW = hard-wired
To MC AC fail
monitor (J2)
3-7