MTS Model 512-04 Hydraulic Power Unit - Manual (Page 26)

Model 512.04 Hydraulic Power Unit 26 Maintenance
Resetting the Thermal Overloads
The thermal overloads of the hydraulic power unit (HPU) can be tripped
by the following conditions:
• Poor motor ventilation
• The output pressure is set too high
• A pump or motor is seizing
The thermal overloads are located in the control box.
Do not open the control box unless the line voltage is turned off. When
power is present in the control box, high voltage and amperages are also
present.
You can be electrocuted if you touch the wrong component in the control
box.
Disconnect the HPU from power before opening the control box.
1. Check the thermal overloads of the power source to the HPU.
• If it has tripped, reset it and try restarting the HPU.
• If the thermal overloads have
not tripped, remove power
from the HPU before opening
the control panel.
2. Unscrew the clamps holding the
control panel’s door shut.
3. Check the thermal overloads
tripped indicator. If it has tripped,
press RESET on the overload.
4. Check for a blown fuse. The
replacement fuse must have the
same rating as the blown fuse.
5. Shut the control box door. Use the
clamps to hold it in place.
6. Reconnect the HPU to its electrical power source.
7. Restart the HPU. If the HPU will not restart or shuts down right away,
call MTS.
WARNING
Thermal
Overloads
Reset
Button
Tripped
Indicator
Fuse