Section 8
Electrical System
20412989
1-2012/Rev 08
8-8
Table 8-1
Sensors and Solenoids
Component Function
Hydraulic Cylinder
9 As pressurized hydraulic oil is sent to one side of the
hydraulic cylinder, it pushes against the piston,
moving it in one direction until it activates the
proximity switch at the end of the stroke. The
hydraulic flow is then sent to the opposite side of the
cylinder, and the piston reverses direction until it
activates the proximity switch at the opposite end of
the stroke.
The green light on the proximity switch indicates
there is power to the switch. The light turns red
when the switch is activated. The proximity
switches are magnetically activated by the presence
of the metallic surface of the piston. When the
switch is activated, it sends a signal to the PLC to
change the flow of the directional control valve and
reverse direction.
High Pressure Safety Dump Valve
10
When control power is removed, the safety
dump valve releases the stored pressure in the
intensifier and high pressure delivery lines. The
high pressure dump valve assembly includes a
normally open high pressure water valve and a
solenoid operated air valve.
The normally open pneumatic dump valve is
held closed by air pressure. When the air
supply is interrupted from an emergency stop,
the valve opens and allows water to flow
through the valve. Pressure is released in the
intensifier and the high pressure water stream
exits through the drain.
Proportional Pressure Control
11 Optional proportional pressure control allows the
operator to select or vary the hydraulic operating
pressure from the control panel or from a remote
console. An electronically controlled hydraulic
cartridge valve, mounted on the hydraulic manifold,
receives a signal from the PLC and automatically
makes the operator selected adjustments.
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