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Electrical System
Chapter 3: Theory of Operation
Electrical System
Logic and Motor Control
Power is supplied to the Logic Control by the P3200 linear power supply. The
power supply provides an unregulated 19 - 35 V DC reference to signal GND
at 2.5 A max, 1.75 A typical (see Power Supply Node HDD for input supply
capabilities). The GROUND is common among all nodes in the bed.
The switch mode power supply consists of an input capacitor for input ripple
current control, an integrated Switch Mode Control Integrated Circuit, the
feedback choke, the output capacitor, and a high current, high speed Schottky
diode. This buck regulator provides DC at 8.2 V and provides 3.5 A of current.
The under voltage detection circuit consists of a series resistor and zener diode
connected to the input voltage source. The zener voltage, along with the base
resistor, provides base current for the NPN bipolar transistor.
When the zener stops conduction due to an under voltage condition, the zener
voltage is off, and turns off the transistor. The input voltage through the series
resistance turns on the NPN transistor switch to the regulator. This will turn off
the regulator.
A diode/bulk capacitor is added to the input of the +5 V regulator to keep the
logic supply up longer than the +8.2 V supply. This time depends greatly on
load current and functions active.
The Logic Controller consists of an embedded controller, a derivative of the
8051 family. The Input/Output structure is configured as an active low for both
input and output. This allows pull ups to be used without the microprocessor
running and not cause any operation to occur. The micro processor can be
disconnected and not have any inputs or outputs enabled. The clock can also be
disabled and not cause any operation to occur. All signals to and from the
microprocessor are buffered. All signals that exhibit a slow rise are Schmidt
triggered to prevent oscillation from occurring. Debounced inputs are provided
for all switch inputs to the microprocessor.
The embedded processor is a Atmel 89C51CC01. This is an 8051 variant with
internal 64K flash program and 256 + 1.2K EEPROM data memory. External
to the microprocessor are the CAN transceiver, watch dog reset circuit, 2K
EEPROM and the buffering circuitry for the H bridge motor controllers, and
the sensors for motor position feedback.
Page 3 - 4
VersaCare™ Bed Service Manual (MAN333 REV 2)
Содержание VersaCare P3200
Страница 2: ......
Страница 6: ...Revisions NOTES Page iv VersaCare Bed Service Manual MAN333 REV 2 ...
Страница 18: ...NOTES Page xvi VersaCare Bed Service Manual MAN333 REV 2 ...
Страница 34: ...Warning and Caution Labels Chapter 1 Introduction NOTES Page 1 16 VersaCare Bed Service Manual MAN333 REV 2 ...
Страница 270: ...Exchange Policy Chapter 5 Parts List NOTES Page 5 4 VersaCare Bed Service Manual MAN333 REV 2 ...
Страница 272: ...Warranty Chapter 5 Parts List NOTES Page 5 6 VersaCare Bed Service Manual MAN333 REV 2 ...
Страница 275: ...Recommended Spare Parts Chapter 5 Parts List NOTES 5 VersaCare Bed Service Manual MAN333 REV 2 Page 5 9 ...
Страница 276: ...Base Frame Chapter 5 Parts List Base Frame Figure 5 2 Base Frame Page 5 10 VersaCare Bed Service Manual MAN333 REV 2 ...
Страница 279: ...Base Frame Chapter 5 Parts List NOTES 5 VersaCare Bed Service Manual MAN333 REV 2 Page 5 13 ...
Страница 281: ...Casters Chapter 5 Parts List NOTES 5 VersaCare Bed Service Manual MAN333 REV 2 Page 5 15 ...
Страница 291: ...Head Siderail Chapter 5 Parts List NOTES 5 VersaCare Bed Service Manual MAN333 REV 2 Page 5 25 ...
Страница 295: ...Siderail Center Arm Assembly Chapter 5 Parts List NOTES 5 VersaCare Bed Service Manual MAN333 REV 2 Page 5 29 ...
Страница 299: ...Power Supply Sheet 1 of 2 Chapter 5 Parts List NOTES 5 VersaCare Bed Service Manual MAN333 REV 2 Page 5 33 ...
Страница 306: ...Air Module Chapter 5 Parts List Air Module Figure 5 14 Air Module Page 5 40 VersaCare Bed Service Manual MAN333 REV 2 ...
Страница 311: ...Sensor Strips Chapter 5 Parts List NOTES 5 VersaCare Bed Service Manual MAN333 REV 2 Page 5 45 ...
Страница 312: ...Sleep Deck Chapter 5 Parts List Sleep Deck Figure 5 18 Sleep Deck Page 5 46 VersaCare Bed Service Manual MAN333 REV 2 ...
Страница 325: ...Treatment Surface P3251EA Chapter 5 Parts List NOTES 5 VersaCare Bed Service Manual MAN333 REV 2 Page 5 59 ...
Страница 337: ...Labels Sheet 2 of 2 Chapter 5 Parts List NOTES 5 VersaCare Bed Service Manual MAN333 REV 2 Page 5 71 ...
Страница 338: ...CPR Cable Chapter 5 Parts List CPR Cable Figure 5 27 CPR Cable Page 5 72 VersaCare Bed Service Manual MAN333 REV 2 ...
Страница 340: ...CPR Cable Chapter 5 Parts List NOTES Page 5 74 VersaCare Bed Service Manual MAN333 REV 2 ...
Страница 363: ......
Страница 365: ...Electronics Schematic P3200 Sheet 1 of 3 Chapter 3 ...
Страница 366: ...Electronics Schematic P3200 Sheet 2 of 3 Chapter 3 ...
Страница 367: ...Electronics Schematic P3200 Sheet 3 of 3 Chapter 3 ...
Страница 368: ...Motor Control P C Board Schematic PN 68717 Chapter 3 ...
Страница 369: ...Logic Control P C Board Schematic PN 69378 Chapter 3 ...
Страница 370: ...Siderail Controls Schematic Chapter 3 ...
Страница 371: ...Optional Controls Schematic Chapter 3 ...
Страница 372: ...Patient Controls Schematic Chapter 3 ...
Страница 373: ...Patient Pendant Schematic Chapter 3 ...
Страница 374: ...Power Supply PN 72289 Sheet 1 of 2 Chapter 3 ...
Страница 375: ...Power Supply PN 72289 Sheet 2 of 2 Chapter 3 ...
Страница 376: ...Motor Control P C Board PN 72273 Chapter 3 ...
Страница 377: ...Power Supply P C Board PN 70786 Sheet 1 of 2 Chapter 3 ...
Страница 378: ...Power Supply P C Board PN 70786 Sheet 2 of 2 Chapter 3 ...