Hill-Rom Advanta P1600, Service Manual

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Theory of Operation
Chapter 3: Theory of Operation
Advanta™ Bed Service Manual (man168ra) Page 3 - 13
3
bed operation. The outputs on connectors P7 and P12 are switched AC line
voltages used to power the split-phase, AC, intermittent-duty motors.
All inputs to the logic control P.C. board are processed simultaneously and
present the motors with power when conditions are correct. The logic control
P.C. board is responsible for reacting to the inputs and providing the outputs
when appropriate. Patient controls in the siderail consist of two assemblies,
part numbers 63208 and 63211, and two cables, part numbers 30601 and
30602, which provide parallel format switch inputs to the logic control P.C.
board and communications junction box.
Outputs of the logic control P.C. board consist of light emitting diode (LED)
current sources to provide a visual indication of bed status. These signals are
available on connector P16. There is an interlock to provide protection against
bed operation when P16 or when any interconnection between P16 and the
footboard is disconnected or removed.
The power supply interconnection on connector P17 provides the interface for
relay power, logic regulator power, ground fault logic clock connections, and
the two enable signals for night light operation and the entertainment system
operation.
The COMposer® Communication System is connected to the logic control via
connector P18 to provide the signals for bed information status that are
presented to the COMposer® Communication System accessory.
A footboard interface P.C. board assembly, part number 63352, provides an
interface between caregiver controls and the logic control P.C. board. This
assembly is provided in a format to cover the standard bed frame, with and
without a scale or Patient Position Monitoring (PPM). The air system bed
frames, with and without a scale or PPM, require the assembly part number
63396. The interfaces provide a memory function for retention of lockout
settings, a multiplexed switch input scheme to reduce wire count and
complexity, and an interface to the logic control P.C. board. The footboard
interface assemblies provide a simple diagnostic LED indicator to the bed,
providing valuable feedback when troubleshooting. Caregiver controls, part
numbers 63276 and 63280, are configured in a row/column format and present
switch position information to the footboard control interface P.C. board. The
interconnection is done at connectors P3 and P4 on the non-air footboard
interface and at P4 and P5 on the air footboard interface.
Cabling assemblies within the logic module have a consistent theme of 1 to n
wiring, where n is the number of positions of the connector. This allows the
cabling to be of similar colors and use the color to identify position on the P.C.