3-9
764332-898
from the table control to conserve battery life when the
unit is off, and powers the delay circuit for motor and coil
enable. The latch relay can also be set (turn power off)
from the override switch PC board whenever any of the
manual switches is activated.
The hydraulic pump motor is activated using either the
table function switches on the hand control or the function
switches on the override board. In either case, a low (DC
ground) signal is fed to switching transistor Q6, which
provides 24 Vdc to motor. The control circuitry is
protected from a locked or shorted pump motor by a
current-monitoring circuit which opens the pump motor
line when the current exceeds 25 amps. This circuit is
automatically reset when the current drain is reduced or
eliminated.
The hydraulic solenoid coils are also powered from the
power-control PC board. The control circuitry is protected
from shorted coils/components by a current-monitoring
circuit. This circuit opens the solenoid voltage line when
current exceeds 2.5 amps. The circuit is automatically
reset when condition is corrected. A solenoid power-cut
circuit is used by the control to save battery power. When
the hand control is being used, the 24 Vdc solenoid voltage
is cut to approximately 8 to 13 volts after the coil is
energized. This current is enough to hold the hydraulic
plunger open once it has been initially energized. The
feature is not used when any of the override switches is
activated.
The ac power indicator, located on the hand control, is
sensed on the powercontrol PC board. When the line cord
is plugged in, the battery charger energizes opto-
isolator(s) that transfer a dc ground to the table control
PC board for processing, which turns on the hand control
LED.
A control reset signal from the table-control PC board
energizes a timing circuit on the power-control PC board
to delay (microseconds) the pump motor and hydraulic
solenoid coil operating voltage until all I/O ports can be
set. This prevents any erroneous table articulation at
power-up.
3.4.2.3 Table Control PC Board
The table-control PC board (master computer) controls
all table functions based on inputs from the hand control,
foot control (optional) and table sensors. Communication
with the hand control is through an RS232 format line.
The table-control PC board contains a dc-dc converter
which reduces the 24 Vdc from the power-control PC
board to 5 Vdc for use in this board and the hand control.
Test points are on the board to monitor this voltage.
Battery voltages are monitored by comparators on the
board. The circuit responds by indicating battery status
to the hand control for display to the operator.
Floor-lock microswitch (two) signals are fed into the
board, which responds by signaling the hand control to
indicate floor-lock status and enabling hand control table
operation. If an unlock indication is sensed by the table-
control PC board, the hand control is disabled.
Foot control signals are input directly into the board via
opto-isolators. The particular table function is activated
when a dc ground is applied to the appropriate pin. The
table must be on and properly oriented for this option to
work.
The AC ON signal from the power-control PC board is
processed by this board and transmitted, via RS232, to the
hand control for display.
Signals from the limit switches for stopping the seat, back
(back limit switch not present on later tables) and raise/
lower cylinders are input directly into this board via opto-
isolators. These switches will stop table movement prior
to reaching a mechanical stop indicated by the hand
control.
The I/O drivers provide a separate ground to each
hydraulic solenoid coil when a table function is activated.
The positive voltage, from the powercontrol PC board, is
already prewired to each coil. All coil activation through
the hand control is through this board.
When using the hand control, the motor ON signal is
generated by the I/O driver board.
A watchdog timer monitors the transmit line from the
table-control PC board to the hand control. This circuit is
looking for a burst of information every 100 milli-seconds.
If not sensed, the CPU will attempt to reset prior to an
automatic cutoff.
NOTE: A jumper is used at P29, Pins 2 and 3, to
configure for battery-operated tables.
3.4.2.4 Hand Control
The hand control houses the “slave” computer which
controls all touch-pad switches (except ON and STOP/
OFF) and all LED table-operation status indications.
Signals from the table function touch pads are
acknowledged and transmitted, via an RS232 format line,
to the table-control PC board which, in turn, activates the
particular hydraulic solenoid. The LEDs next to the
function touch pads indicate the operation status of the
table as received from the “master” computer on the table-
control PC board. The AC ON, BATTERY ON and LOW
BATTERY LED signals are generated directly from the
powercontrol PC board.
A watchdog timer monitors the transmit line of the CPU
for proper bursts of information. A CPU reset is generated
if a communications error is detected between the hand
control and the table control.
Содержание Amsco 3085 SP
Страница 1: ...MAINTENANCE MANUAL Amsco 3085 SP Surgical Table After S N B420702 025 10 07 10 P764332 897 ...
Страница 3: ...OPERATOR MANUAL Amsco 3085 SP Surgical Table 08 10 11 P150830 353 ...
Страница 56: ......
Страница 132: ......
Страница 155: ...18 764332 899 Figure 5 AC Plate Assembly 1 7 3 4 5 6 2 9 10 P17 ...
Страница 161: ...24 764332 899 Figure 8 Column Assembly 1 2 3 4 5 6 7 8 9 ...
Страница 174: ...38 764332 899 Figure 14 Seat Section Assembly LS6 LS7 19 4 13 12 16 2 14 3 11 4 5 9 10 6 7 8 15 1 18 17 ...
Страница 176: ...40 764332 899 Figure 15 Leg Section Assemblies 1 7 2 4 3 5 6 ...
Страница 191: ...56 764332 899 Figure 21 Hydraulic Components Layout Leg Section Seat Section Back Section 12 8 6 5 4 1 2 3 4 7 9 11 10 ...
Страница 197: ...62 764332 899 Figure 24 Motor and Pump Assembly FC FR 11 12 13 2 3 4 6 5 20 18 15 21 17 1 8 7 14 19 15 10 9 ...
Страница 199: ...64 764332 899 Figure 25 Valve Box IV 2 7 7 6 1 1 1 1 10 3 5 3 1 1 8 9 8 9 11 4 3 12 12 1 11 1 2 1 3 1 4 2 FC FR ...
Страница 204: ......
Страница 205: ......
Страница 206: ......
Страница 207: ......
Страница 208: ......
Страница 209: ......
Страница 210: ......
Страница 211: ......
Страница 212: ......
Страница 213: ......
Страница 214: ......
Страница 215: ......
Страница 216: ......
Страница 217: ......
Страница 218: ......
Страница 219: ......
Страница 220: ......
Страница 221: ......
Страница 222: ......
Страница 223: ......
Страница 224: ......
Страница 225: ......
Страница 226: ......
Страница 227: ......
Страница 228: ......