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Omega Engineering CN9400 Improving Control Accuracy, p r o, v i n g C o n t r o l A c c u r a c y

Models: CN9400

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IMPROVING CONTROL ACCURACY

IMPROVING CONTROL ACCURACY

The following functions are to assist engineers with machine development, commissioning and troubleshooting.

Using the CheK Control accuracy monitor

I m

READ SP1 OUTPUT PERCENTAGE POWER

SP1.P

	To start the monitor select	CHEK
	To start the monitor select	ON
		ON
	Note: During monitoring either return to normal operation

p r o

Poor control may be due to incorrectly sized heaters. SP1.P (Level 2) constantly displays the output percentage power applied, which at normal setpoint should ideally be within 20 - 80% to achieve stable control.

CONTROL ACCURACY MONITOR	CHEK

This measures the control stability, to within 0.1 °C/°F.

The monitor is started using CheK (Level 3) and the variance (deviation), maximum and minimum temperature

are displayed and constantly updated in						READ

Temp			Variance
Maximum				VAr°	±0.1°
	hi°

Lo°

Minimum

Time

	or remain in program mode.
	To view monitor readings: index to	READ
	To view monitor readings: index to
	The lower display will alternate between Var°
	and the variance displayed in degrees (e.g. 0.6)
	Press and hold ✱ and press ▲ once, the lower display will
	alternate between VAr° and the maximum hi° displayed
	in degrees (e.g. 320.3)
	Press and hold ✱ and press ▲ once, the lower display will
	alternate between VAr° and the minimum Lo° displayed
	in degrees (e.g. 319.7)
	CheK oFF stops monitor retaining readings	CHEK
	CheK oFF stops monitor retaining readings
		OFF
	CheK on resets readings.	CHEK
	CheK on resets readings.	ON
		ON
	On de-powering CheK resets to oFF and rEAd is zeroed.

v i n g C o n t r o l A c c u r a c y

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Image 19

Omega Engineering CN9400 specifications Improving Control Accuracy, p r o, v i n g C o n t r o l A c c u r a c y

Contents

CN9400 Dual Display Autotune Temperature ControllerUser’s Guide ERROR MESSAGES INDEXI n d e SAFETY INFORMATIONULTIMATE SAFETY ALARMS SAFETY INFORMATIONINSTALLATION CONFIGURATIONLEVELS FUNCTIONS MENUu n c t INSTRUMENT ADJUSTMENTS2Select unit QUICK STARTQ u i c k S t a r t WITH FACTORY SETTINGSCN9400 INTRODUCTIONI n t r o d u c t i o n TUNEAUTOTUNE OVERVIEWO v e r v i e w SET-UPAutotune calculated CYCLE-TIMEO v e r v i e w Cycle-timeselection methods1SELECT INPUT SENSOR POWER-UPSET-UP S e tTo change an option value or setting USING PROGRAM MODEMENU NAVIGATION M e n u N a v i g a t i o nCYCLE-TIME AUTOTUNEA u t o t u n e TUNE PROGRAMPROPORTIONAL CYCLE-TIME TUNE AT SETPOINT PROGRAMREMINDER OF INSTRUMENT ADJUSTMENTS A u t o t u n eTo Select AUTOTUNE CALCULATED CYCLE-TIME CYCLE-TIMERECOMMENDATIONSPROPORTIONAL CYCLE-TIME CYCLE-TIMESELECTION METHODSProportional Cycle-timecontinued P r o p o r t i o n a l c y c l e - t i m eTo Pre-Select Cycle-timeBefore Autotune Set Ramp On g r a m m e rRAMP-SOAK PROGRAMMERSECOND SETPOINT SP2 TO CONFIGURE SP2 AS AN ALARMS e c o n d S e t p e t p SP2 ALARM ANNUNCIATORTO CONFIGURE SP2 AS A PROPORTIONAL CONTROL OUTPUT S e c o n d SERROR MESSAGES Using the CheK Control accuracy monitor IMPROVING CONTROL ACCURACYp r o v i n g C o n t r o l A c c u r a c y10ºC/18ºF LEVELFUNCTION LIST Levels 1 to INT.TAdjust SP2 setpoint F u n c t i o n L i s tSP1 offset/manual reset PROGRAMMER SETTINGS see pageSet scale minimum default 0C or 32F Options Factory settings shown in bracketsLimits maximum SP1 heating power during warm-up Select display resolution for display of processSP1.D OUTPUT CONFIGURATIONLEVEL F u n c t i o n L i s tRead Autotune tuning cycle data see figure, page Sensor span adjustZero sensor error, see SPAn Options Factory settings shown in bracketsLEVEL IMPORTANT NOTE FOR OEM’s: For safety and to protect settings from tamperingF u n c t i o n L i s t DUAL RELAY OR DUAL SSd OUTPUT MODELS FACTORY SET OUTPUT OPTIONSUsing SP2.A Cool option ADVANCED SETTINGSHEAT COOL STRATEGY CONFIGURATION A d v a n c e d S e t t i n g sWater cooled applications CALIBRATION TO ANOTHER INSTRUMENTHeat Cool Strategy Configuration continued A d v a n c e d S e t t i n g sT2-T1 LINEAR INPUT CALIBRATIONA d v a n c e d S e t t i n g s E2-E1 X hi.SC = SPAnA d v a n c e d S e t t i n g sLinear Input Calibration continued 1/16 DIN panel cutout size MECHANICAL INSTALLATIONM e c h a n i c a l I n s t a l l a t i o n DIN PANEL CUTOUTTo mount a Controller proceed as follows MINIMUM SPACING MOUNTINGCleaning M e c h a n i c a l I n s t a l l a t i o nOUTPUT DEVICE ALLOCATION WIRING THE CONNECTORE l e c t r i c a l I n s t a l l a t i o n OUTPUT DEVICESE l e c t r ELECTRICAL INSTALLATION continuedMODEL CN9412 TYPICAL CONNECTION DIAGRAM c a l I n s t a l l a t i o nSensor range SENSOR SELECTIONS e n s o r S e l e c t i o n Option/Sensor typeGeneral SPECIFICATIONS p e c i f i c a t i o n ThermocoupleRETURN REQUESTS/ INQUIRIES WARRANTY / DISCLAIMERServicing Europe omega.comTMServicing North America For immediate technical or application assistance