Section 5
Low Pressure Water System
20412955
8-2012/Rev 08
5-2
5.2 Cutting Water Supply
The quality of the inlet cutting water supply is one of the most important factors affecting
component life and performance. Impurities in the water create grinding and corrosive effects on
all components. See Section 11, Specifications, for details regarding water quality standards.
5.3 Operation
Cutting water is introduced through the 1/2-inch NPT connection on the rear bulkhead of the
machine. Inlet cutting water pressure should be a minimum of 35 psi (2.4 bar) flowing, and can
be monitored from the Cutting Water Supply Gauge on the front of the machine.
Figure 5-2: Low Pressure Water System
Cutting water enters through the normally closed, inlet water solenoid valve. When the control
power is turned on, the solenoid valve opens and allows water to flow through the valve. The
inlet water is monitored by a 30 psi pressure switch mounted on the inlet manifold. If the
pressure drops below 30 psi (2 bar) the switch activates an automatic shutdown circuit in the PLC
and the machine will not start.
NOTE
The machine will not start if inlet cutting water pressure is below 30 psi (2 bar).
If a shutdown occurs due to an overstroke condition, the inlet solenoid valve automatically closes
to prevent water waste due to an external leak. Additionally, the valve automatically closes at the
idle shutdown interval selected by the operator.
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