Steris Amsco 3085 SP, Руководство по обслуживанию

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directional valve (S-10S) to the back cylinder extend ports.
Fluid leaving the back cylinders branches to the second
lowering brake check valve to unseat its pilot check and
to actuate the return line restrictor. This allows fluid
flowing from the other branch to pass through the two-
position directional valve (S-10S), the now piloted
lowering brake check valve, through S-7 and back to the
reservoir.
The Back Down articulation is accomplished by
energizing the S-8, S-9 and S-13 (on early motor and pump
units) solenoids.
NOTE: Energizing the S-9 solenoid introduces fluid
pilot pressure to the S-9S two-position directional
valve, causing it to actuate.
Energizing the S-8 and S-13 (on early motor and pump
units solenoids) allows fluid to flow through the check
valve on the first lowering brake check valve, through the
two-position directional valve (S-10S) where it branches
to the retract ports on the back cylinders and to the second
lowering brake check valve to pilot the check valve and
to actuate the return line restrictor. Fluid leaving the Back
cylinders flows through the two-position directional
valve (S-10S) to the second twoposition directional valve
(S9S), through it to the now piloted lowering check,
through S-8 and back to the reservoir.
3.3.3.7 Floor Lock Operation
See Figure 3-6 and refer to Hydraulic System Schematic
(P134469-303) behind
R
EFERENCE
D
RAWINGS
Tab.
The floor lock operation requires the use of one three-
position directional valve (S-11 and S-12), one start/stop
valve (S-13, on early motor and pump units), three flow
control restrictors and three floor lock cylinders. Because
the floor lock system relies on a mechanical over-
centering method to lock the floor locks, check valves are
not required for this hydraulic circuit.
The Floor Lock function is accomplished by energizing
the S-12 and S-13 (on early motor and pump units)
solenoid valves. This allows fluid to flow through the
S-12 valve to the restrictors on the extend ports of each
cylinder. Fluid flow is restricted as it is passed on to the
cylinders, controlling the extend rate. Fluid leaving the
cylinders returns back to the S-12 solenoid and back to
the reservoir.
The Floor Unlock function is accomplished by energizing
the S-11 and S-13 (on early motor and pump units)
solenoid valves. This allows fluid to flow through the
S-11 valve to the retract ports of the floor lock cylinders.
Fluid exiting the cylinders passes through the flow control
restrictors back to the S-11 valve and on to the reservoir.
Figure 3-6. Floor Lock Operation
3.4 ELECTRICAL SYSTEM
3.4.1 System Description
The Amsco 3085 SP Surgical Table control system is
designed for maximum reliability and includes adequate
system redundancy for almost any circumstance. The
control system utilizes microprocessor technology to
control the hydraulic pump and solenoid valves. The
primary control system consists of a “master” and a
“slave” computer. A secondary and separate override
control system allows operation of basic table functions
CAUTION – POSSIBLE EQUIPMENT
DAMAGE: Static electricity can damage
microprocessor controls. Indiscriminate
probing of circuits or improper
connections may result in immediate or
delayed electrical failure. If the electronics
are to be accessed, use a personal
grounding device. Exercise care in all
activities involving the electronic circuitry
.
S TART/ S TOP
P r e ssur e Relea s e
Valve
Floor Lock
START/STOP
Pressure
Release Valve
(Not Present
on Later
Units)