MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-180 - Manual (Page 78)

Model 505.60 - 505.180 SilentFlo™ HPU 78
Changing the Water Flow
Operation
A. Press the Main Display button to select the Main Display screen.
B. Ensure that pump #1 is present (the Pump #1 Enabled and Pump #1
Disabled button will be visible on the Main Display screen).
If these buttons are not visible, go to the HPU Setup screen and press
the Pump #1 Not Present button to change it to Pump #1 Present.
C. Press and hold the Run/Low Pressure button. After 15 seconds, pump
#1 will start and run to circulate the hydraulic fluid through the heat
exchanger. If you stop holding the Run/Low Pressure button for more
than five seconds, the pump will stop.
4. After the displayed Hyd Fluid Temp display drops below 55°C (131°F),
release the Run/Low Pressure button after five seconds, the pump will
stop.
Press the Reset button to clear the interlock and turn the indicator off.
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
The HPU Fault Status on the user interface panel displays Return Filter Dirty
or Pressure Filter Dirty (if a pressure filter is installed) 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
On water-cooled units, water is used to maintain hydraulic fluid temperature.
(See Air-Cooling Product Information manual, MTS part number 100-135-073,
regarding air-cooled units.) 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.