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Electrical System
Chapter 3: Theory of Operation
IntelliDrive® Transport System Charge Power
Connector, P5, provides the 1.1 ADC path to the IntelliDrive® Transport
System switching regulator board. P5-4 provides feedback to the
microprocessor that the IntelliDrive® Transport System cable is connected.
Logic Power
P2-6 provides 1.5Adc, 20 to 45 VDC power the logic board depending on
whether the system is power by AC or DC. Diode, D5, steers the power. Relay,
K2, is used to connect or disconnect system logic power when AC power is
off.
VCC
U13 regulates VCC to 5 VDC +/- .07. The +8 VDC distributed power is
supplied from the logic board.
Microprocessor
U8 is an 8051 CAN version microprocessor. U7 serves as a watch dog, power
up reset, and low Vcc reset. U9 serves as the CAN transceiver.
Foot Controls
Connectors, P23 and P24, via Port0 read the foot control (hall effect) switches.
The resistors and capacitors provide ESD protection. The night lights are
supplied by the reg8VDC and driven by half of U14. Each night light
draws approximately 65 mA.
Obstacle Detection
Connectors, P27, P30, P31, and P32, provide power to the three obstacle detect
infrared transmitters and detectors. When no obstacles are detected, the
detection signal, P31-2, P30-3, and P32-3 is a zero to 5 V DC signal. The
signal will be hi for 600 micro seconds and low for 2000 micro seconds. The
74Hc14 squares up the signal. The 100K ohm resistor and 0.1uF capacitor
integrate the signal and generate a DC voltage of 3.7v +/- .25. This signal is
read by the analog to digital converter. Any signal less than 3.2 VDC or above
4.2 VDC will be considered an obstacle detection.
3
VersaCare™ Bed Service Manual (MAN333 REV 2)
Page 3 - 7
Summary of Contents for VersaCare P3200
Page 2: ......
Page 6: ...Revisions NOTES Page iv VersaCare Bed Service Manual MAN333 REV 2 ...
Page 18: ...NOTES Page xvi VersaCare Bed Service Manual MAN333 REV 2 ...
Page 270: ...Exchange Policy Chapter 5 Parts List NOTES Page 5 4 VersaCare Bed Service Manual MAN333 REV 2 ...
Page 272: ...Warranty Chapter 5 Parts List NOTES Page 5 6 VersaCare Bed Service Manual MAN333 REV 2 ...
Page 279: ...Base Frame Chapter 5 Parts List NOTES 5 VersaCare Bed Service Manual MAN333 REV 2 Page 5 13 ...
Page 281: ...Casters Chapter 5 Parts List NOTES 5 VersaCare Bed Service Manual MAN333 REV 2 Page 5 15 ...
Page 340: ...CPR Cable Chapter 5 Parts List NOTES Page 5 74 VersaCare Bed Service Manual MAN333 REV 2 ...
Page 363: ......
Page 365: ...Electronics Schematic P3200 Sheet 1 of 3 Chapter 3 ...
Page 366: ...Electronics Schematic P3200 Sheet 2 of 3 Chapter 3 ...
Page 367: ...Electronics Schematic P3200 Sheet 3 of 3 Chapter 3 ...
Page 368: ...Motor Control P C Board Schematic PN 68717 Chapter 3 ...
Page 369: ...Logic Control P C Board Schematic PN 69378 Chapter 3 ...
Page 370: ...Siderail Controls Schematic Chapter 3 ...
Page 371: ...Optional Controls Schematic Chapter 3 ...
Page 372: ...Patient Controls Schematic Chapter 3 ...
Page 373: ...Patient Pendant Schematic Chapter 3 ...
Page 374: ...Power Supply PN 72289 Sheet 1 of 2 Chapter 3 ...
Page 375: ...Power Supply PN 72289 Sheet 2 of 2 Chapter 3 ...
Page 376: ...Motor Control P C Board PN 72273 Chapter 3 ...
Page 377: ...Power Supply P C Board PN 70786 Sheet 1 of 2 Chapter 3 ...
Page 378: ...Power Supply P C Board PN 70786 Sheet 2 of 2 Chapter 3 ...