MTS Multi-Pump Control Manager Remote Human-Machine Interface - Manual (Page 30)

Remote Human Machine Interface 28
Recovering From an Interlock
Operation
2. Add hydraulic fluid to the reservoir until the sight glass on the side of the
HPU indicates the proper level.
3. Verify that the hydraulic fluid level sensor is detecting the proper fluid level.
4. Press Reset to clear the interlock and change the unit status back to normal.
Hyd fluid
overtemperature
A hydraulic fluid overtemperature interlock is indicated on the Main screen by a
flashing red Faulted indicator, a blue Bypass indicator, a red Oil Temp indicator,
and a blue Status indicator. The interlock is generated when the temperature
exceeds 55°C +/- 3°C (121°F +/- 5°F). The interlock will automatically shut
down the HPU. The HPU cannot return to normal operation until the fluid has
cooled. Perform the following to correct an overtemperature interlock:
1. Start cooling the hydraulic fluid by circulating hydraulic fluid through the
heat exchanger (Overtemp Bypass mode).
A. If necessary, press the Main button to select the Main screen.
B. Ensure that module with the lowest hours is enabled (Module #N
Enabled is green).
C. Press the Bypass button. The enabled pump module will start and run
to circulate the hydraulic fluid through the heat exchanger. The red
flashing Faulted indicator changes to yellow Overtemp Bypass and the
Bypass button changed to Stop.
Note The bypass cooling will run for five minutes and shut off. If after five
minutes the HPU us still overtemperature, press Bypass again.
Continue until the HPU clears the overtemperature condition. The HPU
automatically stops, transitions to Ready when running in bypass mode,
and clears the overtermperature condition.
2. If the there is no change in the Oil Temp reading after several minuets,
determine if the hydraulic fluid is receiving adequate cooling.
• The cooling water inlet temperature affects the efficiency of cooling
the hydraulic fluid.
• Check the cooling water inlet-to-outlet pressure differential. It should
be between 0.24–0.31 MPa (35–45 psi). If necessary, adjust the water
pressure at its source.
3. After the displayed fluid temperature drops below 55°C (131°F), press the
Stop button.
4. Press the Reset button to clear the interlock and turn the indicator off.