Omega Engineering CN9400 FUNCTION LIST Levels 1 to, Int.T, 10ºC/18ºF, SP1 derivate time/rate

FUNCTION LIST (Levels 1 to 4)

Note: A Functions Menu is shown on the cover fold-out A3

LEVEL 1

Function Options [Factory settings] shown in brackets

t	SELECT AUTOTUNE
i s
	TUNE	[oFF]	on ParK At.Sp
L
		Used to switch the Autotune feature on and off, to
n		select ParK or Autotune at setpoint.
		ParK temporarily turns the output(s) off. To use select
o
		ParK and exit program mode. To disable re-enter
t i		program at tunE and select oFF.
	SP1 OPERATING PARAMETERS
n c
	BAND	0.1 to *	°C/°F	[10ºC/18ºF]
u		SP1 proportional band/Gain or Hysteresis
		* 25% sensor maximum
F
		Proportional control eliminates the cycling of on-off

control. Heater power is reduced, by time proportioning action, across the proportional band.

	Too narrow		Too wide
	(oscillates)		(slow warm up and response)
16
	increase	BAND	decrease	BAND

Function	Options [Factory settings] shown in brackets
INT.T	oFF 0.1 to 60 minutes [5.0]
	SP1 integral time/reset
	Auto-corrects proportional control offset error

Too short		Too long
(overshoots and oscillates)		(slow warm up and response)
DER.T	oFF 1 - 200 seconds [25]

SP1 derivate time/rate

Suppresses overshoot and speeds response to disturbances

	*	* disturbance
Too short		Too long
(slow warm up and response,		(oscillates and over corrects)
under corrects)
DAC	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 small		Too large
(overshoots)		(slow stepped warm up)