MTS Model 512-14 Hydraulic Power Unit - Manual (Page 24)

512.14 Hydraulic Power Unit 24
Resetting the Thermal Overloads
Operation
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.
CAUTION
Thermal
Overloads
Reset
Button
Tripped
Indicator
Inside Control Box
Fuse