SECTION 9
HYDRAULIC SYSTEM
Dec 2002
Page 9-4
05114640
9.2 Operation
The hydraulic system operates at HI or LO pressure settings up to the
maximum flow capacity of the variable displacement piston pump. Upon
selecting HI or LO, the operator is able to adjust the HI or LO pressure controls
within the respective adjustment ranges.
The electric motor (7) drives the variable displacement, pressure compensated
pump (6). The hydraulic manifold (5) is mounted on the pump discharge. The
flow from the pump passes through check valve to the directional control valve
(8), and the directional control valve sends the flow to the hydraulic cylinders
(9) in one direction until the piston activates the proximity switch at the end of
the stroke. The activated proximity switch sends an electrical signal to the
programmable controller (PLC). This PLC in turn activates the directional
control valve (8) to change flow and to reverse direction of movement of piston
until activating the opposite end-of-stroke proximity switch.
Although one DCV supplies hydraulic power to two intensifier hydraulic
cylinders arranged in parallel, these cylinders operate at approximately the
same cycle rate due to logic built into the PLC (see Section 8, Electrical System).
9.2.1 Hydraulic Pressure Adjustment
A variable displacement pressure compensated feature maintains constant
operating pressures even under variable flow demands. Dual pressure control
is standard. Switching high to low pressure may be done at the control panel
(or remotely) with the HI-LO switch that activates the solenoid valve (11). The
HI pressure is set by adjusting the knob and the LO pressure is adjusted using
a wrench on that relief cartridge (2). Turning the knob/adjusting the screw
clockwise increases pressure.
NOTE
In order to remote select the pressure, the HI-LO switch should be set to
the “HI” position.
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