MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-11 - Manual (Page 42)

Model 505.07/.11 SilentFlo™ HPU 42
Changing the Water Flow
Operation
5. Press the Reset button to clear the overtemperature interlock at the HPU.
You may need to clear the interlock at the controller, (see your controller
manual).
6. You may want to continue running the HPU to cool it off even further. Turn
the High/Low/Start switch to the Start position (the High/Low/Start
switch returns to the Low position). Continue to run the HPU in the low
pressure mode until the hydraulic fluid is sufficiently cooled.
Dirty filter
The Dirty Filter indicator lights when the differential pressure across the filter
increases. A dirty filter condition will prevent the HPU from being started, but it
will not stop the HPU while it is running.
1. Replace the hydraulic fluid filter.
2. Press the Reset button to clear the interlock and turn the indicator off.
Changing the Water Flow
The flow of water is the only way to maintain the temperature of the hydraulic
fluid on a water-cooled HPU. The water-regulating valve, located on the water
inlet line of the HPU, senses the hydraulic fluid temperature and automatically
controls water flow to the heat exchanger.
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.
Water Regulation Valve
Adjustment
Water Solenoid Valve