5 Feeder hydraulics Quick stop 3256
Item
Explanation
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-
P1
Working hydraulics oil pressure (also pre-loaded while diesel engine is OFF)
P2
Feed pressure
-
-
T
Return line to tank
-
-
Y255
Feeder drive pump adjustment solenoid valve
Y256
Main drive brake valve solenoid valve
Y257
Feeder quick stop solenoid valve
Description of function Main drive not braked
When the main drive is ON, solenoid coil (Y256) is energized. The shut-off valve (794-1) is not switched by the oil pressure P1. The blockage is canceled. The main drive is not braked.
Feeder quick stop
When the feeder quick stop function is triggered, e.g. by the metal or the stone detector, power supply to the feeder quick stop solenoid valve (Y257) is interrupted. The oil pressure of the pressurised working hydraulics sets the feeder quick stop valve (791) to its shut-off position. In this shut-off position, the oil flow from the feeder drive motor (254) is blocked. The oil flow from the feed drive variable-displacement pump is short-circuited (feed and return lines are connected via valve (791)).
Feed drive pumpapprox. 0displacement after a short delay time
After a short delay time, solenoid coil (Y255) is accordingly energized by 1200mA. This makes the feed drive variable-displacement pump (253) swing to the quick stop operating mode, i.e. approx. 0 displacement.
Feed / Oil cooling
The feed oil pressure P2 serves for feeding the pump/motor hydraulic circuit via the multi-function valves (792/793). It also serves as variable-displacement oil pressure for variable-displacement pump (253). Oil cooling is achieved by constantly tapping oil into the variable-displacement pump housing via orifice plate (408).
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000 293 892 1 - SYS-H JAGUAR 493 - 03/06
