MTS Systems FlexTest SE Service Information

Model 493.02 Controller Service
About Tuning
Tuning
208
Square/Tapered Square A square waveform requires the servovalve to open rapidly to a large
opening. It is the most demanding waveform because it requires the
maximum response from the servoloop system. It also places a large
acceleration on the test system and specimen.
Tapered square waves taper from 0% to 100% amplitude at the
beginning of execution, and from 100% to 0% at the end of execution.
• A square waveform is most useful for tuning displacement.
• A square waveform has an infinite velocity command.
• Do not use a square waveform when tuning a control mode that
uses an extensometer. The large accelerations can cause the
extensometer to move or fall off the specimen, which can cause
the system to go unstable.
• Monitor the feedback or error signal to evaluate the system
stability.
Ramp/Tapered Ramp A ramp waveform (also called a triangle waveform) requires the
actuator to move at a constant rate. This requires the servovalve to
move quickly between two discrete openings. Cycling a ramp
waveform produces a triangle waveform.
Tapered ramp waves taper from 0% to 100% amplitude at the
beginning of execution, and from 100% to 0% at the end of execution.
• A ramp waveform is useful for all levels of tuning.
• Use a ramp waveform if a square waveform creates excessive
velocities or acceleration for the type of specimen being tested.
• Monitor the feedback or error signal to evaluate the system
stability.
Sine/Tapered Sine A sine waveform (also called sinusoidal or haversine) requires the
servovalve to move at a variety of rates.
Tapered sine waves taper from 0% to 100% amplitude at the beginning
of execution, and from 100% to 0% at the end of execution.
• Monitor the feedback or error signal to evaluate the system
stability.

MTS Systems FlexTest SE Specifications

General

Brand	MTS Systems
Model	FlexTest SE
Category	Controller
Language	English