West Control Solutions ProVU 4 - Manual (Page 51)

ProVU4 Controller, Profiler & Recorder/Controller - Product Manual
Page 50 Configuration & Use 59407, Issue 1 – March 2008
Control Configuration Sub-Menu
Table 10. Control Configuration Sub-Menu Screens
Control Configuration:
Control Enable/Disable Sets the method to enable/disable the control output(s). From:
Enabled (always); Disabled (always); Enable/Disable via Digital Input
A or B, or Operator Selectable (allows control output(s) to be turned
off from Operation Mode).
Caution: The instrument is not able to
control the process when control is disabled. The Output Power
Lower Limit parameters are also ignored. Use with care!
Auto/Manual Mode
Access w Sets the method to select Automatic or Manual Control. From:
Automatic (always); Manual (always); Select via Digital Input A or B,
or Operator Selectable (allows automatic or manual control to be
selected from Operation Mode).
Caution: In Manual Mode, the user
must alter power to control the process correctly (0 to 100% or -100
to +100% for dual control). Manual power is not restricted by the
Output Power Limit parameters. Use with care!
Control Type w Set to Single Control for Primary control only (e.g. Heating or Cooling
only) or to Dual for Primary and Secondary Control outputs (e.g.
Heating & Cooling).
Primary Control Action w Set the Primary Control Output for Reverse or Direct Action. Reverse
action applies more primary power as the process falls further below
setpoint (e.g. heating applications). Direct action applies more
primary power as the process rises further above setpoint (e.g.
cooling applications).
Secondary output action is always opposite to Primary action.
Control Status Displays the current Process Variable and Setpoint values to aid
manual tuning – This screen is Read Only.
Power Output Level Displays the current Primary and Secondary control power levels
(each 0 to 100%) to aid manual tuning – This screen is Read Only.
Primary Proportional
Band Sets the width of the Primary Proportional Band between 0.5% and
999.9%, or select On-Off control. – This screen is Read Only during
automatic tuning.
Secondary Proportional
Band Sets the width of the Secondary Proportional Band between 0.5%
and 999.9%, or select On-Off control. – This screen is Read Only
during automatic tuning.
Integral Time Constant Sets the Integral Time Constant (Automatic Reset) from 1s to 99min
59s or OFF. – This screen is Read Only during automatic tuning.
Derivative Time
Constant Derivative Time Constant (Rate) from 1s to 99 min 59s or OFF. –
This screen is Read Only during automatic tuning.
Manual Reset (Bias) Sets the Manual Reset (Proportional Band Bias) from 0-100%
or -100 to +100% for Dual Control.
Overlap / Deadband Sets the Overlap (+ve values) or Deadband (-ve values) between
Primary & Secondary Proportional Bands when Dual Control is used.
Primary On-Off
Differential Sets the Primary On-Off control hysteresis (deadband) from 0.1 to
10.0% of Span (centred about setpoint), when Primary On-Off control
is used.