Hydraulics QUANTUM TIC
11-80 10/04
4.2.3 Close knife frame Solenoid valves (12-M3), (18) and (29) are energized.
The volume flow (10 l/min.) flows to the hydraulic cylinders (19) via port B
of solenoid valve (12) and from there via solenoid valve (18).
The backside build-up of pressure moves the spool (5) of circulation
valve (4) back against the volume flow.
The oil displaced from the hydraulic cylinders (19) flows back into the
tank via solenoid valve (29) and port A of solenoid valve (12).
The knife frame is closed.
When the hydraulic cylinders hit their limit stop, the pressure relief valve
(8) opens. The spool (5) of the circulation valve (4) opens and the volume
flows back into the tank via the circulation valve (4).
When switching off, the solenoid valves (18) and (29) switch first and
then, after a delay, the solenoid valve (12-M3).
4.2.4 Open knife frame Solenoid valves (12-M4), (18) and (29) are energized.
The volume flow (10 l/min.) flows to the hydraulic cylinders (19) via port A
of solenoid valve (12) and from there via solenoid valve (29).
The backside build-up of pressure moves the spool (5) of circulation
valve (4) back against the volume flow.
The oil displaced from the hydraulic cylinders (19) flows back into the
tank via solenoid valve (18) and port B of solenoid valve (12).
The knife frame is opened.
When the reed switch is actuated, the control light flashes and the
solenoids (12-M4), (18) and (29) are switched off.
When the reed switch cable is disconnected, the knife frame can be
opened until the cylinders hit their limit stop.
From forage wagon no. …, both buttons (close and open) must be
pressed simultaneously.
There is no need for the cable to be disconnected any more.
When switching off, the solenoid valves (18) and (29) switch off first and
then, after a delay, the solenoid valve (12-M4).
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