MTS Model 506-62-72 Hydraulic Power Supply - Manual (Page 5)

Introduction 1-1
Section 1
Introduction
Definition The Model 506.62/.72 Hydraulic Power Supply (HPS) uses a variable-
volume (pressure compensated) main pump, with a pressurized
(supercharged) hydraulic fluid inlet, to provide pressure to systems
with various flow requirements. The HPS is designed to be used with
servo-controlled, electro-hydraulic systems.
019-341M
1.1 Functional Description
Front panel controls
and indicators Front panel controls on the HPS include local operating controls for the
main pump and supercharge pump. Front panel indicators show running
time, power on, low fluid level, fluid over-temperature, and dirty filter
conditions.
Pressure output
Pressure output is controlled by an adjustment on the main pump and is
monitored by the output pressure gage. An adjustable back-up relief
valve limits output pressure by porting fluid back to the reservoir when
the output pressure rises above the relief valve setting. High/low
pressure operation is controlled by the high/low solenoid valves.
These valves control the main pressure control (pressure compensator)
vent ports and the backup relief valve vent port.