MTS Series 505G2 SilentFlo Hydraulic Power Unit Model 505G2-11 - Manual (Page 44)

Model 505G2.07/.11 SilentFlo™ HPU 44
Resetting the Thermal Overloads and Circuit Breakers
Note When the HPU is turned off, a solenoid valve also shuts off the flow of
water to the heat exchanger.
The water-regulating valve is adjusted at MTS Systems Corporation to maintain
the hydraulic fluid temperature at 43°C (110°F). However, the temperature of
your water may require you to readjust the regulator.
To set the operating temperature of the hydraulic fluid:
1. Start the HPU and switch to high-pressure mode.
2. Observe the temperature gage as the hydraulic fluid temperature rises. Note
the temperature where the hydraulic fluid stabilizes.
3. 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 the screw counterclockwise to increase the operating
temperature.
4. Note the effect after 15 minutes.
5. Repeat Step 3 and Step 4 until the hydraulic fluid temperature stabilizes
between 43°C–49°C (110°F–120°F).
Resetting the Thermal Overloads and Circuit Breakers
The electrical power feed line for each pump motor has a circuit breaker with
integrated 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 Regulation Valve
Adjustment
Water Solenoid Valve