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Electrical System
Chapter 3: Theory of Operation
AC Detection
The circuitry around Q8 detects the presence or absence of AC power and
produces a static binary signal.
Miscellaneous Drivers
Q7 drives the charge supervisory relay, K3. Q11 drives the logic relay, K2.
Half of U14 drives the motor power relay, K1. Q9 drives the battery status
LED.
Analog Section
U12 is a battery gas gauge. It measures battery charge and discharge currents
from the current sense resistor, R100, and converts it to coulombs. The
microprocessor uses this data to update the battery status. U15 is a 10 bit
digital to analog converter. The D to A ultimately controls the charge
transistor, Q2. U11 is a 12 bit analog to digital converter. U19 is a temperature
sensor. U10 is used to buffer the battery voltage divider. The OP amp circuit of
U10 is a backup measurement device for battery charge current and is used to
check the gas gauge current reading.
Nurse Call Relay Power
Diodes, D13, D17,and D26, provide power to the nurse call relay (located on
the SideCom® Communication System P.C. board) while AC is on and while
AC is off if the battery is capable.
LED Driver
U16 drives five red LEDs used to indicate power supply errors. It also drives
three green LEDs used to indicate the battery charging state.
EEPROM
U20 is used to store voltage offset data for the back up charge current opamp,
U10, and the battery capacity.
User Interface
Power is supplied to the User Interface system by the P3200 central power
supply. The power supply provides a pre-regulated 8.2V DC +/- 5% referenced
to signal GND. The GND is common among all nodes in the bed.
Page 3 - 8
VersaCare™ Bed Service Manual (MAN333 REV 2)
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 ...