MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-30 - Manual (Page 15)

505.20/.30 HPU Functional Description
Model 505.20 - 505.30 SilentFlo™ HPU Introduction 15
505.20/.30 HPU Functional Description
Pump
A variable volume pump draws hydraulic fluid from the reservoir and pressurizes
it to the adjusted output pressure, typically 21 MPa (3000 psi).
A check valve prevents hydraulic fluid from being siphoned back into the
reservoir.
The pressurized fluid is controlled by a control manifold that contains the high/
low pressure solenoid valve and a non-adjustable relief valve set at 22.4 MPa
(3250 psi).
Fluid Sample Port Access port for obtaining hydraulic fluid samples from the HPU. A quick
disconnect port is provided. Use the optional sampling kit that includes a needle
valve to regulate the flow through the sample port.
Heat Exchanger Cools the hydraulic fluid by using an oil-to-water heat exchanger. The heat
exchanger removes most of the heat generated by the HPU.
Hydraulic and Water
Ports Connecting points for the hydraulic fluid distribution system, water source, and
return lines.
Low Level/
Overtemperature
Sensor Senses the hydraulic fluid level and temperature. Control interlocks automatically
shut the HPU down if the fluid level drops too low or the hydraulic fluid
temperature rises above the temperature sensor’s setting.
Output Pressure
Control Sets the output pressure of the HPU.
Output Pressure Gage Displays the hydraulic pressure being output from the HPU.
Nameplate Provides basic product information such as model number, serial number, electrical
information, and so forth.
Power Disconnect
Switch Disconnects the incoming power from the HPU. The switch is a lockable,
mechanical latch. Power is removed whenever the door to the electrical enclosure is
open (the switch is in the off position). However, incoming power lines to the
switch are live unless power is removed externally.
Pressure Relief Valve Prevents the HPU from exceeding 22.4 MPa (3250 psi).
Reservoir Holds the hydraulic fluid and houses the hydraulic pump and motor.
Sight Gage Lets you observe the hydraulic fluid.
Surge Suppressor
Charge Valve Allows the surge suppressor to be charged with nitrogen.
Temperature Gage Displays the temperature of the hydraulic fluid.
Water Flow Regulator Sets the amount of water flowing through the heat exchanger. Adjust the water flow
to regulate the temperature of the hydraulic fluid.
Component Descriptions (Continued)
Component Description