Omega Engineering CN9400 - Manual (Page 20)

Function List
FUNCTION LIST
(Levels 1 to 4)
BAND
Too narrow
(oscillates)
increase
Too wide
(slow warm up and response)
decrease
BAND
Note: A Functions Menu is shown on the cover fold-out A3
LEVEL 1
F unction Options [Factory settings] shown in brackets
SELECT AUTOTUNE
[oFF] on ParK At.Sp
Used to switch the Autotune feature on and off, to
select ParK or Autotune at setpoint.
ParK temporarily turns the output(s) off. To use select
ParK and exit program mode. To disable re-enter
program at tunE and select oFF .
SP1 OPERATING PARAMETERS
0.1 to * °C/°F [10ºC/18ºF]
SP1 proportional band/Gain or Hysteresis
* 25% sensor maximum
Proportional control eliminates the cycling of on-off
control. Heater power is reduced, by time
proportioning action, across the proportional band.
F unction Options [Factory settings] shown in brackets
oFF 0.1 to 60 minutes [5.0]
SP1 integral time/reset
Auto-corrects proportional control offset error
oFF 1 - 200 seconds [25]
SP1 derivate time/rate
Suppresses overshoot and speeds response to
disturbances
0.5 - 5.0 x bAnd [1.5]
SP1 derivative approach control dAC
Tunes warm-up characteristics, independent of normal
operating conditions, by controlling when derivative
action starts during warm-up (smaller dAC value =
nearer setpoint).
Too short
(overshoots and oscillates) Too long
(slow warm up and response)
Too short
(slow warm up and response,
under corrects) Too long
(oscillates and over corrects)
*
* disturbance
Too small
(overshoots) Too large
(slow stepped warm up)
16
TUNE
BAND
INT.T
DER.T
DAC