MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-11 - Manual (Page 43)

Resetting the Thermal Overloads
Model 505.07/.11 SilentFlo™ HPU Operation 43
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
Each incoming electrical power feed line has a thermal overload switch. If any
line draws too much current, its thermal overload switch trips and disconnects the
HPU from the electrical power feed.
Additional protection is provided by line fuses (FU1–FU3) and transformer fuses
(FU4–FU6). These cartridge-type fuses must be replaced with fuses of the same
size, type, and rating, which vary according to the voltage configuration.
A tripped thermal overload or a blown fuse indicates a potential short circuit, too
much current in the motor, or a component failure (mechanical or electrical).
To reset the thermal overload switches or replace the fuses:
Transformer Fuses
FU4–FU6
Line Fuses
FU1–FU3
Thermal
Overload