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CONTROL CONFIGURATION SUB-MENU SCREENS
Control Loop 1 - Sub-menu to setup Control Loop 1. Press
+
to return to Input Menu
These settings apply to the master loop if the controller has been setup for cascade control.
Control Mode
Select the fundamental application type, from: Standard; Cascade or Ratio.
Refer to the Application Setup section.
Note: Choosing Cascade or Ratio disables the use of the 2nd input as a
fully independent control loop.
Cascade Mode
Opens or closes the cascade link. Cascade-Open breaks the master-slave
connection. This allows slave loop to be tuned & adjusted independently.
Caution:
Return to Cascade when finished!
Profile Selection Type
Select the bit pattern to be used for profile selection. Binary or BCD (Binary
Coded Decimal). Select None if profile selection not is required.
Control Select
Select from Control Standard or Control VMD (TPSC).
Use Control VMD to directly drive the windings of a motorized valve. This uses
a 3-point stepping algorithm giving “open” and “close” outputs.
Use Standard for all other applications (including solenoid valves or modulat-
ing valves with positioning circuitry requiring mA or VDC signals).
Control Enable/Disable
Used to temporarily disable the control outputs. Select control Enabled (nor-
mal) or Disabled – when disabled, control output(s) for this loop are turned off
(unless manual mode has been selected), and the setpoint value is replaced
by “OFF”.
Caution:
The instrument is not able to control the process when
control is disabled and the Output Power Limits are ignored.
Auto/Manual Control
Selection
Switches the control loop between Automatic and Manual Control. The opera-
tor monitors and alters power to correctly control the process (0 to 100% or
-100 to +100% for dual control).
Caution:
Manual mode overrides the automatic control loop. It
also ignores any output power limits, valve open/close limits and
the control enable/disable setting. The operator is responsible for
maintaining the process within safe limits.
Control Type
Select Single Control for primary control only (e.g. heating only or cooling only)
or Dual for primary and secondary control outputs (e.g. heating and cooling) -
Dual is not possible with Ratio or VMD Control.
Primary Control Action
Set the primary control output for Reverse or Direct Action. Reverse action ap-
plies additional primary power as the process falls further below setpoint (e.g.
heating applications).
Direct action applies additional primary power as the process rises higher
above setpoint (e.g. cooling applications).
In dual control, secondary output action is opposite to primary action.
Control Status
A “read-only” diagnostic status display of the current loop 1 process variable
and effective setpoint values to assist with manual tuning.
Power Output Levels
A “read-only” diagnostic status display of the current loop 1 primary and sec-
ondary % output power levels to assist with manual tuning – Not shown with
VMD Control. Does not apply if control is disabled or in manual mode.
Gain Schedule PID Set
in Use
A “read-only” diagnostic status display showing the PID set in use. The set
used may vary based on the current setpoint or process variable value. – Only
shown if Gain Scheduling is in use.
Summary of Contents for Chromalox 4081
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