West Control Solutions 8700+ - Manual (Page 159)

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Glossary 59305, Issue 7 – March 2014
Use of continuous self-tuning is not always appropriate for applications which are frequently
subjected to artificial load disturbances, for example where an oven door is likely to be
frequently left open for extended periods of time.
The Self-Tune feature on Valve Motor Drive controllers always sets the Rate parameter to
zero (OFF) because derivative action is not usually desirable in these applications.
Self-Tune cannot be engaged if a controller is set for On-Off Control.
Also refer to Minimum Motor On Time, On-Off Control, Pre-Tune, PID, and Tuning.
Serial Communications Option Type: General Definition
An feature that allows other devices such as PC’s, PLC’s or a master controller to read or
change an instruments parameters via an RS485 Serial link. Full details can be found in the
Serial Communications sections of this manual.
Also refer to Controller, Indicator, Master & Slave, Limit Controller and PLC
Set Valve Closed Position Type: VMD Controller Parameter
When Valve Position Indication is to be used on Valve Motor Controllers, this parameter
defines the input value that will be measured by the Auxiliary Input, when the valve is fully
closed. The valve must driven to its “Closed” end stop before setting this parameter.
It must not be used to limit valve movement, separate Valve Close and Open Limit
parameters are available for this purpose.
Display code =

, default setting = Auxiliary Input Range Minimum.
Also refer to Auxiliary Input, Set Valve Opened Position, Valve Close Limit, Valve Open Limit,
Valve Motor Control and Valve Position Indication.
Set Valve Opened Position Type: VMD Controller Parameter
When Valve Position Indication is to be used on Valve Motor Controllers, this parameter
defines the input value that will be measured by the Auxiliary Input, when the valve is fully
opened. The valve must driven to its “Open” end stop before setting this parameter.
It must not be used to limit valve movement, separate Valve Close and Open Limit
parameters are available for this purpose.
Display code =

, default setting = Auxiliary Input Range Maximum.
Also refer to Auxiliary Input, Set Valve Closed Position, Valve Close Limit, Valve Open Limit,
Valve Motor Control and Valve Position Indication.
Setpoint Type: Controller Definition
The target value at which a controller will attempt to maintain the process variable by
adjusting its power output level. Controllers can have either one or two setpoints. These can
be one or two local internal setpoints (

or

and

), or one local internal setpoint
(

) and one externally adjusted remote (

) setpoint, if a Remote Setpoint module is
fitted. The value of the setpoints can be adjusted between the Setpoint Upper Limit and
Setpoint Lower Limits. The active setpoint is defined by the status of the Setpoint Select
parameter or a digital input.
Also refer to Limit Setpoint, Process Variable, Remote Setpoint, Scale Range Lower Limit,
Setpoint Lower Limit, Setpoint Upper Limit and Setpoint Select