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Theory of Operation
Chapter 3: Theory of Operation
Advanta™ Bed Service Manual (man168ra)
Page 3 - 19
3
accessory connectors available for future needs on the power supply P.C.
board. The unregulated voltage is monitored by a circuit that disables the relay
power supply and the PPM/Scale module. Line voltages, or loads that create
unregulated voltages less than approximately 10-12 volts, disable the output of
the relay/Scale/PPM power supply. Recovery occurs when the line voltage or
load condition returns to normal.
The power supplies are independent and unique. Each has its own protection
from overload, that prevents one output load issue from bringing down the
entire system. The air system module has built-in current-limiting in the
design; all others are protected by current/temperature protection PTC’s. The
PTC is sized within a module current requirement and duty cycle. All fuses are
soldered in the board. Fuse failure is remote and usually indicates failure of a
primary power supply component. Fuse rating and part number must be
identical to maintain regulatory approval of the bed power supply.
The ground fault circuit measures the voltage differential on the neutral line
coming in to the bed. This particular circuit is referenced to the bed chassis
ground. Any differential greater than approximately 6 volts turns on the FET
and, therefore, turns on the emitter follower that outputs to an optocoupler
which isolates to the logic control P.C. board. This allows detection of a loss of
ground or a phase-neutral reversal to be determined.
The night light circuit is a comparator circuit that determines a reference point
via an adjustable potentiometer, and a CdS photocell that determines resistance
based on ambient light. A regulated power supply is connected to the
comparator circuit and the DC bulb used for a light source.
The power supply is linked to the logic control P.C. board via connector P7
using a cable, part number 6148904. A regulated voltage and current-limited
supply is sent to the relays used on the logic control P.C. board. A regulated
voltage and current-limited supply is also sent to the logic control regulator.
The scale and PPM module is supplied pre-regulated voltage that is current
limited. The interconnect scheme is a connector P13 and a cable, part number
63727. There are two nurse Call signals brought to the power supply P.C.
board to connect to the communications junction box assembly.
The Universal Television (UTV) and communications junction box assembly
is supplied two pre-regulated voltages that have current-limiting protection.
The interconnection is presented by connector P12 and a cable, part number
63726. The power supply has interconnections for Nurse Call signals that are
generated by the scale and PPM module.
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...