
26
OPERATION MODE SCREEN SEQUENCE
Two Control Loops: Profiler Status
LED Indicators
LED Function Labels
Engineering Units*
Profile Status Indicators*:
Process Variable Values &
Setpoints*
Loop Descriptions*
Profile Name & Progress
Segment No. Type & Progress
(or Delayed Start Time)
* = in loop 1 & 2 screen area
2-LOOP PROFILE STATUS
Run,
Held,
■
Stopped
Default LED indicator functions are as shown in the initial base screen.
In manual mode the effective setpoints are replaced by the
%Manual Power and the label “MAN”.
In manual mode with valve motor drive the setpoints are replaced by valve
Open / Stop / Close.
Note: If power is lost when a profile is running and recovery is set to continue, the bar-graph re-starts
from the beginning but the overall time remains correct.
Event Status
Lists all configured profile events with their current status (Active or Inactive) –
Shown only when the instrument is in profiler mode.
Cascade Mode
Allows the user to open the cascade, breaking the master-slave link for commis-
sioning & tuning.
CAUTION:
Return to Cascade-CLOSE when finished!
*only shown if set to do so in Display Configuration.
Auto/Manual Control Se-
lection – Loop 1 (or Cas-
cade Slave)
Switches loop 1 (or the cascade slave loop) between automatic and manual
control modes. Switching between these modes uses “Bumpless Transfer”. *only
shown if set to do so in Display Configuration.
When using standard PID control, Manual mode replaces the Setpoint display with
a -100 to 100% power output level value, labelled “
Man”. The
or
keys are
used to adjust the manual power value.
When using VMD control, Manual mode replaces the Setpoint display with the
valve movement status (
Opening, Closing or Stopped), labelled “Man”. The
key opens the valve and the
key closes the valve.
If Manual control is selected when in Cascade mode, the slave loops % power
value shown. This is the power output fed directly to the control actuator (e.g.
power to the heater elements).
CAUTION:
Manual mode overrides the automatic control loop. It also
ignores any output power limits, valve open/close limits and the con-
trol enable/disable setting. The operator is responsible for maintain-
ing the process within safe limits.
Note: If power is lost when a profile is running and recovery is set to continue,
the bar-graph re-starts from the beginning but the overall time remains correct.
Setpoint Value Display &
Adjustment – Loop 1
View and adjust the main and alternate setpoints for loop 1 (or the master loop in
cascade mode). The setpoints can be set to any value within the setpoint limits set
in Control Configuration. View and adjust local (internal) setpoints for the loop. The
currently selected setpoint is marked as “active”. If the alternate setpoint is remote
it cannot be adjusted from the keypad.
Summary of Contents for Chromalox 4081
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