ER5000 —
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Glossary of Terms
to noise, at the expense of system stability and cycle life of the
ER5000’s solenoid valves.
Offset
Also known as Steady State Error: a condition of Proportional-
only response where the system reaches a stable state that is
slightly above or below the targeted Setpoint. Two aspects of
Proportional contribute to this effect: the inevitable mechanical
lag between generation of Error and the physical response of the
valves to the controller output and the fact that a response that
is a direct multiple of error will always fall short of 100% error
correction. Proper Tuning generally aims to eliminate offset by
adding Integral.
Open Collector
A common type of output for integrated circuits, where the
emitter of the transistor is connected to ground and the collector
of the transistor is connected to the output. Instead of outputting
a signal of a specic voltage or current, the output acts as either
an open circuit or a connection to ground. Open collector circuits
are used in many systems, such as to interface devices that have
different operating voltage levels or to connect multiple open
collector devices to a single line.
Overshoot
Overcorrection due to a Proportional or Integral setting that is
too high. Must be carefully controlled to keep response within the
operational parameters of the system. Proper Tuning generally
aims to minimize overshoot.
PC
Acronym for Personal Computer.
PID Controller
An automated control device that monitors a property of a
mechanical system in a continual loop and uses an algorithm
incorporating a Proportional, Integral and Derivative component
to correct Error and maintain system stability.
Pilot Pressure
The pressure applied to the top of a Dome Loaded or Air Actuated
Regulator that controls the Control Pressure of that regulator.
The ER5000 is most commonly used to control pilot pressure to a
dome loaded or air actuated regulator.
PLC
Acronym for Programmable Logic Controller.
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