5 Feeder hydraulics Feeding 3256
Item
Explanation
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-
P1
Working hydraulics oil pressure (also pre-loaded while diesel engine is OFF)
P2
Feed pressure
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T
Return line to tank
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-
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.
Feed drive pumpDisplacement according to the cutting length setpoint
Solenoid coil (Y255) is accordingly energized by PWM. This makes the feed drive variable-displacement pump (253) swing to the feeder mode, i.e. a displacement according to the pre-selected cutting length. The feeder quick stop solenoid valve (Y257) is energized. The feeder quick stop valve (791) is in its open position. Multi-function valve (792) restricts the high pressure for the feeding process to 420 bar.
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). When feeding, oil is flushed out of the pump / motor hydraulic circuit via the open shut-off valve (794-2).
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000 293 892 1 - SYS-H JAGUAR 493 - 03/06
