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Theory of Operation
Chapter 3: Theory of Operation
Advanta™ Bed Service Manual (man168ra)
Page 3 - 23
3
The analog assembly is responsible for scale readings and memory retention.
The analog circuitry is located in the weigh frame of the bed as close to the
load beams as possible. The load beams are resistive bridge sensors excited by
a regulated DC voltage. The inputs from the load cells are through connectors
P1 through P4.
The scale display P.C. board (P/N 63344) is located in the footboard, is
connected to the PPM microprocessor (P/N63217) assembly through P1, and
uses an eleven position blue cable. The display is capable of showing weight
ranges from –450 lb to +450 lb. There are six switches available for user
inputs. These are connected in a 2-row-by-3 column matrix. They perform
typical scale functions like zero, on/off, and change items.
Air Control P.C. Board—P/N 44760
Echelon Node
The Echelon node consists of an Echelon microprocessor (U1, MC143150FU,
Neuron), 32Kbyte PROM (U2), power up reset circuit (U11), 10 MHz crystal,
and an RS485 transceiver (U3). The nodes’ I/O pins, I/O_0 through I/O_3
make up a 4 bit bi-directional data bus. I/O_4 through I/O_6 are used as
address lines for the HC138 decoder. The decoder outputs are chip select lines
for the HC244A and HC240A buffers (inputs) and for the four HC175 flip-
flops (outputs). I/O_8 through I/O_10 make up the Neurowire bus. These three
signals, along with other chip select lines, are used to transmit/receive data
from the sensor/valve module in the mattress. Resistor R111 is used as a
termination load for the RS485 bus. If the air control P.C. board is not the last
node on this bus, this resistor should be removed.
Latches and Buffers
Chip select (enable) lines of the HC244A and HC240A buffers allow their
outputs to access the data bus. The buffers are used to read most of this board’s
digital inputs. The chip select (clk) lines of the HC175 flip-flops are used to
latch data already on the data bus into the flip-flops. Most of the outputs on this
board are controlled from these flip-flops.
Valve/Sensor Module Digital Control Lines
CONN_CHK (P114-13) is an input signal that determines if the user-
accessible connector (located under the foot section) is connected or not. If the
signal is LO, the cable is either disconnected or there is no logic power
available on the sensor/valve board. Relay K1 will be opened by the
Содержание Advanta P1600
Страница 2: ......
Страница 6: ...Revisions Page iv Advanta Bed Service Manual man168ra NOTES...
Страница 22: ...Chapter 1 Introduction Page 1 4 Advanta Bed Service Manual man168ra NOTES...
Страница 66: ...Warning and Caution Labels Chapter 1 Introduction Page 1 48 Advanta Bed Service Manual man168ra NOTES...
Страница 141: ...Chapter 3 Theory of Operation Advanta Bed Service Manual man168ra Page 3 3 3 LON Communication Error 3 45...
Страница 142: ...Chapter 3 Theory of Operation Page 3 4 Advanta Bed Service Manual man168ra NOTES...
Страница 190: ...Chapter 4 Removal Replacement and Adjustment Procedures Page 4 6 Advanta Bed Service Manual man168ra NOTES...
Страница 310: ...Warranty Chapter 5 Parts List Page 5 4 Advanta Bed Service Manual man168ra NOTES...
Страница 321: ...Weigh Frame Assembly Chapter 5 Parts List Advanta Bed Service Manual man168ra Page 5 15 5 NOTES...
Страница 347: ...Right Head End Siderail Chapter 5 Parts List Advanta Bed Service Manual man168ra Page 5 41 5 NOTES...
Страница 353: ...Footboard P1606 Chapter 5 Parts List Advanta Bed Service Manual man168ra Page 5 47 5 NOTES...
Страница 357: ...Head and Foot Hilow Drive Assembly Chapter 5 Parts List Advanta Bed Service Manual man168ra Page 5 51 5 NOTES...
Страница 361: ...Head Drive Screw Assembly Chapter 5 Parts List Advanta Bed Service Manual man168ra Page 5 55 5 NOTES...
Страница 365: ...Knee Drive Screw Assembly Chapter 5 Parts List Advanta Bed Service Manual man168ra Page 5 59 5 NOTES...
Страница 371: ...Power Module Chapter 5 Parts List Advanta Bed Service Manual man168ra Page 5 65 5 NOTES...
Страница 384: ...Permanent IV Rod P2221 Chapter 5 Parts List Page 5 78 Advanta Bed Service Manual man168ra NOTES...
Страница 386: ...Chapter 6 General Procedures Page 6 2 Advanta Bed Service Manual man168ra NOTES...
Страница 402: ...Tool and Supply Requirements Chapter 6 General Procedures Page 6 18 Advanta Bed Service Manual man168ra NOTES...
Страница 404: ...Chapter 7 Accessories Page 7 2 Advanta Bed Service Manual man168ra NOTES...
Страница 411: ...Schematic Wiring Diagram Scale Bed Exit Analog Board P N 4975102 FO 3 1 m168_101 Back to Chapter 3...
Страница 412: ...Schematic Wiring Diagram Patient Switch Board P N 67208 FO 3 2 m168a103 Back to Chapter 3...
Страница 413: ...Schematic Wiring Diagram J Box UTV Board P N 64935 FO 3 3 m168_107 Back to Chapter 3...
Страница 414: ...Schematic Wiring Diagram Footboard Scale Switch Display P N 63344 FO 3 4 m168_109 Back to Chapter 3...
Страница 415: ...Schematic Wiring Diagram Footboard Function Switch Footboard LED PN 63280 FO 3 5 m168_111 Back to Chapter 3...
Страница 416: ...Schematic Wiring Diagram ZoneAire Sleep Surface Switch Footboard LED Board P N 63276 FO 3 6 m168a113 Back to Chapter 3...
Страница 417: ...Schematic Wiring Diagram Logic Board PN 63285 FO 3 7 m168_115 Back to Chapter 3...
Страница 418: ...Schematic Wiring Diagram Power Board PN 63349 FO 3 8 m168_118 Back to Chapter 3...
Страница 419: ...Schematic Wiring Diagram Frame Interface Board PN 63352 FO 3 9 m168_120 Back to Chapter 3...
Страница 420: ...Schematic Wiring Diagram Scale Bed Exit Control Board P N 63217 FO 3 10 m168a123 Back to Chapter 3...
Страница 421: ...Schematic Wiring Diagram ZoneAire Sleep Surface Interface Board P N 6339601 FO 3 11 m168a126 Back to Chapter 3...
Страница 422: ...Schematic Wiring Diagram Sensor Board PN 4474001 FO 3 12 m168_128 Back to Chapter 3...
Страница 423: ...Schematic Wiring Diagram Air Control Board PN 44760 Sheet 1 of 2 FO 3 13 1 m168_147 Sheet 2 of 2 Back to Chapter 3...
Страница 424: ...Schematic Wiring Diagram Air Control Board PN 44760 Sheet 2 of 2 FO 3 13 2 m168_177 Sheet 1 of 2 Back to Chapter 3...
Страница 425: ...Schematic Wiring Diagram Head Sensor Assembly P N 63888 FO 3 14 m168a186 Back to Chapter 3...
Страница 426: ...Schematic Wiring Diagram Advanta Bed Wiring Diagram A model beds FO 3 15 m168a185 Back to Chapter 3...
Страница 427: ...Schematic Wiring Diagram HIlow Knee Sensor PN 63885 FO 3 16 m168_178 Back to Chapter 3...
Страница 428: ...Schematic Wiring Diagram Inner Patient II Board P N 67203 B model beds FO 3 17 m168a179 Back to Chapter 3...
Страница 429: ...Schematic Wiring Diagram Advanta Bed Wiring Diagram B model beds FO 3 18 m168a180 Back to Chapter 3...