Omega Engineering CN9400 Proportional Cycle-Time, Cycle-Timeselection Methods, Factory set

The choice of cycle-time is influenced by the external switching device or load. eg. contactor, SSR, valve. A setting that is too long for the process will cause oscillation and a setting that is too short will cause unnecessary wear to an electro-mechanical switching device.

CYCLE-TIME SELECTION METHODS

The following methods of cycle-time selection may be used:

Autotune calculated

After Autotune has been run and completed the calculated cycle-time can be manually accepted or adjusted to suit the switching device. For selection method see Select Autotune

Calculated Cycle-time.

Pre-select Autotune cycle-time

The controller can be programmed to automatically accept any calculated Autotune cycle-time. For selection method see Pre-Select Automatic Acceptance of Any Autotune

Cycle-time,page 10.

Pre-select before Autotune

The controller can be programmed manually with any cycle-time between 0.1 and 81 sec. This cycle-time will not be changed by any Autotune functions. For selection method see Pre- Select Cycle-time Before Autotune, page 10.

PROPORTIONAL CYCLE-TIME

Factory set				P
To use the 20 sec factory set cycle-time no action is needed				r
whether autotune is used or not.				o p
CYCLE-TIME RECOMMENDATIONS
				o
Output	Factory	Recommended	Load max
				r
Device	Setting	Minimum	(resistive)
				t i
Internal relay	20 seconds	10 seconds	2A/250 Vac
rLY/rLY1				o
Internal relay	20 seconds	10 seconds	1A/250 Vac
				n
rLY2
Solid state	20 seconds	0.1 seconds	Externally	a
drives			fitted SSR
				l
SSd/SSd1/SSd2			(n/a)
				c y
To Select AUTOTUNE CALCULATED CYCLE-TIME
On completion of Autotune enter program mode.				c l
Select			CYC.T
				e
The controller will display CYC.t and 20 (the factory
			CYC.T	-
setting) in seconds
			20	t
To view the calculated optimum cycle-time press and hold				i
the ✱ button then press and hold ▼ until indexing stops.				m
The controller will display the calculated cycle-time in the
				e
lower display e.g. A 16. This indicates that the calculated

cycle-time is 16 seconds	CYC.T
	A16

9