168 HyPrecision 50S/60S/75S Operator Manual 808690
7 – Troubleshooting
Troubleshooting
Water pressure
No water pressure or low water pressure
The pump pressure usually falls when the cutting head is turned on.
If the water coming from the intensifier is at a lower pressure than expected:
Make sure that the cut pressure is set correctly. Refer to page 60 for instructions.
Make sure that the pump is not in pierce-pressure mode.
If the value on the prefilter water-pressure gauge is less than 2.76 bar or 275.79 kPa (40 psi), the water pressure
going to the intensifier is too low.
The most common cause of this alarm is a lack of water to the pump. A pressure switch after the boost pump
senses the water pressure. If the water pressure falls to a value that is less than the setpoint, the monitoring
circuit opens and causes a fault.
A pressure switch after the water filters senses the water pressure to the intensifier. A sustained pressure of less
than 2.76 bar or 275.79 kPa (40 psi) causes the pump to turn off. This protects the equipment from running
without enough pressure to the intensifier.
Check the water flow. While the pump is running, loosen a brass fitting after the low-pressure water solenoid. If a
very small amount of water or no water leaks immediately from the loosened fitting, consider these causes.
Fault/warning Stack light Result
The low-pressure water is at less
than 2.76 bar or 275.79 kPa (40 psi)
Red
The intensifier turns off.
The pump runs in cooling mode.
Possible cause Solution
Water isn’t flowing through the water filters.
1. Turn ON the pump in cooling mode.
2. Push the water filter purge buttons until water comes
out from under each button.
The relief valve on the pump manifold has failed. Replace the valve.
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