MTS Series 505G2 SilentFlo Hydraulic Power Unit Model 505G2-180 - Manual (Page 68)

Description Item
Flow to External System 1
Return Flow from System 2
High Pressure Flow 3
Circulation Pump 4
HPU Manifold 5
Heat Exchanger 6
Filter 7
Low Pressure Flow 8
Reservior 9
Low pressure
Series 505 HPUs are started in low pressure to reduce the amount of current inrush at motor start-up. A
solenoid valve that opens a direct flow path to the return line commands the pressure setting. Since this direct
path offers little resistance to the full flow, minimal system pressure is developed (low pressure). Low pressure
operation of a Series 505 HPU provides several useful functions when high pressure is not required by the
external system.
System commissioning
Best practices for system commissioning include flushing the hard line and related equipment. This process
“conditions” the hydraulic fluid to a cleanliness level that supports high performance servovalve systems.
Refer to the Hydraulic Fluid Care Guide (part number 050-000-536) for information on fluid cleanliness.)
A logical progression of fluid conditioning that begins at the HPU is required to minimize problems when
commissioning a system.
68 Series 505G2 SilentFlo™ Hydraulic Power Unit Product Information
Operation