SECTION 8
ELECTRICAL SYSTEM
Aug 2002
p. 8-1
49836323
Section 8 ELECTRICAL SYSTEM
8.0 Electrical System—Stripped Proportional Pump.
A single electric motor powers the main hydraulic axial piston, variable
displacement pump, a hydraulic gear- type pump for oil cooling and filtration
(recirculation system) and a low pressure water booster pump.
All motor starter and control functions for the stripped version of the pump are
supplied by the motion / cutting table OEM. Individual descriptions of the
sensors and solenoids on the pump are listed in section 8.1 below.
Section 8.1 Sensor and Solenoid Functional Descriptions—SL-IV(plus)
3S10
Inlet Water Pressure Switch—
This normally- closed (NC) switch is located on the low pressure water filter
assembly, this pressure switch opens at approx. 60 psi, telling the PLC that
there is insufficient pressure at the inlet to the high pressure (HP) cutting water
inlet check valves. Note that the HP water inlet check valves (2 each) are located
in the sealing heads of the SL4 intensifier.
3S9
Booster Pump Pressure Switch—
This normally- closed (NC) switch is located on the low pressure water filter
assembly, this pressure switch opens at approx. 30 psi, telling the PLC that
there is insufficient pressure at the inlet to the cutting water booster pump.
This switch is intended to protect the booster pump from damage due to
insufficient water supply pressure.
5Y8
Safety High Pressure (HP) Dump Valve
The HP dump valve is located on the frame of the pump, in the HP line leading
from the intensifier and between the HP attenuator and the HP outlet
connection on the frame. 5Y8 cable provides 24 vdc power to a small air
solenoid that directs shop air pressure (80-120 psig) to an actuator on the
safety dump valve. Loss of air pressure will allow the dump valve to open,
thereby reducing HP water pressure, regardless of whether or not the pump is
operating. 24 vdc power must be available in 5Y8, and shop air must be
available to the dump valve in order to close the valve.
Note that as the air requirements for this dump valve are low, it may be useful
to install a small air tank (an automotive ‘air pig’ works satisfactorily) in the air
supply to the pump. A check valve ahead of the air tank connection prevents
loss of pneumatic pressure to the pump in the event of a plant- wide air supply
interruption.
Summary of Contents for STREAMLINE SL-IV PLUS
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