MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-11 - Manual (Page 15)

Functional Description
Model 505.07/.11 SilentFlo™ HPU Introduction 15
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).
Pressure
The start/low/high switch on the front panel of the electrical enclosure controls
the hydraulic pressure of the HPU. The start/low/high switch operates like an
automotive ignition switch; turn and hold the switch in the start position until the
motor starts running. The switch returns to the low position.
Drain Valve Drains the hydraulic fluid from the reservoir.
Fluid Level Gage Displays the level of the hydraulic fluid.
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
Connections Connection 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, and
electrical information.
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.
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 (part 2 of 2)
C OMPONENT D ESCRIPTION