Instron DX Series System Concepts Manual

41
Frame
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reservoir. For maintenance of the air filter, refer to maintenance information provided in the System
Operating Instructions (supplied separately).
Screen trapper
A tightly meshed screen trapper is placed in the reservoir’s fill hole. This screen prevents larger debris
from entering the reservoir when it is filled. Maintenance of the screen trapper should be done anytime
oil is added to the reservoir, refer to maintenance information provided in the System Operating
Instructions (supplied separately).
Oil temperature switch
A temperature switch is mounted in the reservoir that monitors the temperature of the oil. The switch will
trip at an oil temperature of 74 +/-6 deg. C (165 +/-10 deg. F). This prevents the oil temperature from
exceeding the recommended maximum temperature. The controlling software will indicate a “Motor
Temp” error. Refer to Problem No. 16 of Table 5 on page 44.
Pump and motor
An electric motor is used to operate the pump that forces oil from the reservoir, through the high pressure
hydraulic hoses and into the hydraulic cylinder. As the controller directs the frame to place load on a
specimen, the HPS builds pressure in the system and the piston is actuated inside the hydraulic cylinder.
Some pump and motor information is listed in Table 3.
The pump is equipped with a flow control adjustment that controls the system idle pressure. Idle
pressure is the pressure of the HPS when it is operating under no load conditions (i.e. when the frame is
not being adjusted or performing a test). This flow control adjustment is set at the factory and should not
require further adjustment. Any adjustments should only be made by an Instron service engineer.
For pump and motor maintenance, refer to the separately supplied manufacturer’s information.
Manifold assemblies
The function of any manifold is to control and route the hydraulic oil as needed to various system
components. The following manifold assemblies may be present on this system (dependent on frame
configuration):
• Servo manifold assembly
• Crosshead motor manifold
• Hydraulic grips manifold
• Speed control manifolds
Table 3. HPS information.
Frame Model
Required Flow at
Maximum Testing Speed Idle Pressure
System Relief
Pressure
Motor
Power
300DX 3.03 Lpm (0.8 gpm) 28 bar (400 psi) 182 bar (2650 psi) 3 hp
600DX 3.33 Lpm (0.88 gpm) 28 bar (400 psi) 179 bar (2600 psi) 3 hp

Instron DX Series Specifications

General

Brand	Instron
Model	DX Series
Category	Test Equipment
Language	English