Section 8
Electrical System
20412989
1-2012/Rev 08
8-6
Table 8-1
Sensors and Solenoids
Component Function
Inlet Water Solenoid Valve
1 The normally closed, inlet water solenoid valve is
located at the service bulkhead. When the control
power is turned on, the valve opens and allows low
pressure cutting water to enter. The solenoid valve
functions as a safeguard by closing if a leak is
detected anywhere in the system, or if the system is
idle for an extended period.
The operator can adjust the idle closing time from 5
to 60 minutes. The function can also be disabled so
the valve stays open whenever the control power is
on.
Low Pressure Water Filter Assembly
2 The 30 psi pressure switch, mounted on the inlet
manifold, monitors the inlet cutting water. If the
pressure drops below 30 psi (2 bar) the switch
activates an automatic shutdown circuit, protecting
the booster pump from damage due to insufficient
water supply pressure.
3 A temperature switch monitors the temperature of
the cutting water from the booster pump. If the
temperature exceeds 128 F (53 C), the switch
activates an automatic shutdown circuit in the PLC.
The temperature switch prevents booster pump
overheating due to lack of water, long deadhead
conditions or a blocked orifice.
4 To ensure adequate water pressure and supply to the
intensifiers, the discharge pressure is monitored by a
60 psi pressure switch. An automatic shutdown
occurs if the pressure is below 60 psi (4 bar).
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