Operation
48 Series 505G2 SilentFlo™ Hydraulic Power Unit
Watchdog Fault
The HPU Fault Status on the user interface panel displays Watchdog Fault if the watchdog timer
stops operating properly. A watchdog fault causes the HPU to shutdown. Perform the following
procedure to attempt to recover from this fault.
1. Turn the power disconnect switch on the main enclosure to off.
2. Wait at least 60 seconds, then close the power disconnect switch.
3. From the Startup Screen, press the Main Display button.
4. On the Main Display screen, press the Reset button.
5. If the Watchdog Fault condition does not clear, contact MTS Systems
Dirty filter
A dirty filter interlock is indicated on the Main screen by a yellow Alarm indicator and a blue Status
indicator. Press the Status button to display the Status screen and note the yellow Return Filter Dirty or
Press(ure) Filter Dirty indicator(s). The interlock is generated when the filter capacity has reached a
critical level. 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 dirty hydraulic fluid filter. Refer to procedures for return line filter replacement and
high pressure filter replacement as required.
2. Press Reset 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.
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