Berchtold OPERON B 810, Service Parts

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OPERON B 810 SURGICAL TABLE
PRINCIPLES OF OPERATION
Rev. 1 70-000-0027
4-4
LEDs on the extension board will turn on and off
to indicate movement of the locks.
8. When valves Y74 and Y75 are open, the pressure
is the same at feet 3 and 4. If the floor is uneven,
the fluid will flow to the foot with the least
resistance, which on an uneven floor, is the one
that must travel the most distance.
9. When both feet hit the floor, the pressure
increases.
10. Pressure switch P2 closes when the pressure
reaches 580 psi (40 bar).
11. When P2 closes, a signal is sent to the controller
that the feet are locked, illuminating the lock
LED on the pendant, and de-energizing the pump
and the power to P1, Y74, and Y75.
12. When Unlock is pressed, Y72 is energized,
allowing pump pressure to open the pilot valves.
Y73 is energized to allow fluid to flow from feet
1 and 2, and fluid flows freely from Y74 and
Y75 via their check valves. Springs in each foot
push the fluid out, allowing the feet to retract.
FIGURE 4-6. FLOOR LOCK SYSTEM OPERATION
Floor Lock Quick Disconnect
The floor lock cylinders connect to the hydraulic
lines with quick disconnect fittings (FIGURE 4-7).
This allows any of the lock cylinders to be removed
and replaced without the need to open the floor lock
system. Since the quick disconnects preclude air
from entering the lines, there is no need to bleed the
hydraulic system after disconnecting the lock
cylinders. Nevertheless, BERCHTOLD recommends
that the floor lock cylinders not be replaced by the
end user because of the risk of contamination
entering the hydraulic system.