Omega Engineering CN9400 - Manual (Page 12)

Autotune
The TUNE AT SETPOINT program will now start. The upper display
will alternate tune and the process temperature.
The lower display will read the setpoint value.
Note: During tuning the main setpoint (SP1) LED will flash.
When the TUNE AT SETPOINT program is complete the upper
alternating display stops and only the process temperature is
displayed. The PID values are entered automatically. The
process temperature will rise to setpoint and control should
be stable. If not, this may be because optimum cycle time
is not automatically implemented. To set the cycle time see
PROPORTIONAL CYCLE-TIME.
When the TUNE program is complete the upper alternating
display stops and only the process temperature is displayed. The PID
values are entered automatically. The process temperature will rise
to setpoint and control should be stable. If not, this may be
because optimum cycle time is not automatically implemented. To
set the cycle time see PROPORTIONAL CYCLE-TIME.
TUNE AT SETPOINT PROGRAM
Enter program mode and select
And from the display select
Exit program mode.
Temp
Setpoint
Start
TUNE
Tuning
PID
1 3 / 4 on/off tuning
cycles
New PID
values
entered
Time
(100% output)
AT.SP
Overshoot
during tuning
Prop band
REMINDER OF INSTRUMENT ADJUSTMENTS
Press ▲ ▼ together for 3 seconds for program entry or exit.
Press ▲ or ▼ to scroll through functions.
Press ✱ ▲ together or ✱ ▼ together to change levels or alter
options.
Note: If in difficulty by becoming “lost” in program mode,
press ▲ and ▼ together for 3 seconds to return
to display mode, check the Menu Navigation
summary above and try again.
8
TUNE
OFF
TUNE
AT.SP