MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-180 - Manual (Page 79)

Resetting the Thermal Overloads
Model 505.60 - 505.180 SilentFlo™ HPU Operation 79
The water-regulating valve is adjusted at MTS Systems Corporation to maintain
the hydraulic fluid temperature within the range of 43–49°C (110–120°F).
However, the temperature of your water might require you to readjust the
regulator.
To set the operating temperature of the hydraulic fluid.
1. If not already selected, press the Main Display button on the user interface
panel to select the Main Display.
2. Press Run/Low Pressure to start the HPU in low pressure.
3. Press the High Pressure button to select the high-pressure mode.
4. Observe the Hyd Fluid Temp on the Main Display screen as the hydraulic
fluid temperature rises. Note the temperature where the hydraulic fluid
temperature stabilizes.
5. Adjust the water-regulating valve. One full turn (360°) of the adjusting
screw produces a change in hydraulic fluid temperature a few degrees.
• Adjust the screw clockwise to decrease the operating temperature.
• Adjust counterclockwise to increase the operating temperature.
6. Note the effect after 15 minutes.
7. Repeat Steps 5 and 6 until the hydraulic fluid temperature stabilizes between
43°C–49°C (110°F–120°F).
Resetting the Thermal Overloads
The electrical power feed line for each pump motor has a thermal overload
switch in the main electrical enclosure. If any pump motor draws too much
current, its thermal overload switch trips and disconnects that pump motor from
the electrical power feed.
Water Inlet
Water Regulating
Valve Solenoid Valve
Filter
Assembly