Hypertherm HyPrecision 15, Operator'S Manual

Page: 161 / 194

HyPrecision15/30/50 Operator Manual 808240 161
7 – Troubleshooting
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Hydraulic fluid
Low pressure
The most common causes of low hydraulic fluid are a leak from a fitting or a hose in the hydraulic system and loss of
hydraulic fluid during routine maintenance. A float switch in the hydraulic fluid tank triggers an alarm when the hydraulic
fluid level is too low.
If the hydraulic fluid pressure is low, take these actions.
 Make sure that the cut pressure is set correctly. Refer to page 55 for instructions.

Make sure that the pump is not in pierce-pressure mode.
 Make sure that the pressure in the hydraulic pump and pressure compensator is increasing.

Make sure that the relief valve on the pump manifold has not failed.
High temperature
The normal operating temperature of the hydraulic fluid is 37.7°C to 43.3°C (100°F to 110°F). High altitude and high
ambient temperatures can have an effect on the temperature of hydraulic fluid. Fluid that is too cool becomes thick and
causes increased friction and poor lubrication. Fluid that is too warm becomes thin, which accelerates wear on the parts,
increases the formation of sludge, degrades the fluid, and decreases lubrication and protective qualities.
A sensor in the hydraulic fluid tank monitors the hydraulic fluid temperature with 3 switches. One switch closes
at 45.0°C (113°F), 1 switch opens at 55.0°C (131°F), and 1 switch opens at 65.0°C (149°F).
The 55.0°C (130°F) alarm permits the primary motor and the intensifier to continue running. The 65.0°C (150°F) alarm
permits the primary motor to continue running for 2 minutes. If the alarm condition is still present, the primary motor turns
off.
An unexpected increase in pump temperature indicates a problem with the cooling system. Check these possible causes.
Symbol Fault/warning Stack light Result
Low hydraulic fluid Red
The intensifier turns off.
The pump turns off.
Symbol Fault/warning Stack light Result
The hydraulic fluid temperature
is equal to or higher than
55.0°C (131°F)
Amber
The intensifier continues running.
The pump continues running.
The hydraulic fluid temperature
is equal to or higher
than 65.0°C (149°F)
Red
The intensifier turns off.
The pump runs for 2 minutes.
After 2 minutes, the pump turns off.