MTS Hydraulic Power Unit Model 506-92 - Manual (Page 11)

Operation 2-3
2.2 Operation Procedures
This section provides the local and remote operating procedures for the
506.82/.92 Hydraulic Power Unit.
WARNING !
Do not start the HPU if the servovalve command is not equal to feedback
(that is, zero balanced).
Failure to do this can result in sudden actuator movement which may
cause injury to persons and/or damage to equipment.
Ensure that the system is at zero balance before starting the HPU.
Before you begin Before you begin operation complete the following steps:
1. Make sure that the external hydraulic system is ready for operation.
2. Press the Pump 1 Select or Pump 2 Select switch to select main pump
operation.
N O T E The Dirty Filter indicator may light during a cold-start. It
should turn off when the HPU reaches its normal
operating temperature. If the indicator fails to turn off,
correct the condition (Subsection 3.1.1.2) and press Reset.
Local operation To operate the HPU in local control mode complete the following steps:
1. Press the Local Mode switch to run the HPU in local control.
Activating this switch lights an LED in its upper right corner.
2. Apply electrical power to the HPU (the Power On indicator will
light).
3. Press Reset (must be pressed whenever electrical power to the HPS
has been interrupted).
4. Press the Start switch to apply low pressure to the system.
5. Check the HPU and external hydraulic system for leaks and unusual
sounds.
6. Press the High Pressure to apply high pressure to the system.
7. Press Stop on the HPU front panel to stop the HPU and remove
output pressure.