The heater power outputs should be binary weighted (1:2:4:8 same for heating and cooling). The corresponding number of steps has to be entered in configuration of the step controller. Access will automatically calculate the individual activation levels. Deactivation level can be adjusted by changing the "Hysteresis for switching step" value.


e.g.

for 4 step binary step controller the activation of the first level occurs approximately at 100/15=6.7 % ((Sequence output %)/(number of binary levels)).

Deactivation occurs approximately at 6.7-1= 5.7% of the sequence output (Level activation - hysteresis).


The general delay time for change of level state (On to Off to On ...) can be set.


The analog output signal may be used to fill out between the steps. The analog output signal of the step controller will go 0 to 100 % between the activation of each step. The load connected to the analog output signal should have the same size as the smallest of the binary groups.



Example of setting 4 step binary step controller for heating sequence



Configuration > Functions > Function activation > Heating/Cooling sequence setup > Step controller 2

Step controller sequence

... | Heating | …

Sequence to control a step controller

Step control type

| Sequential | Binary |

Number of steps

| 1 | 2 | 3 | 4 |

Block output if sequence feedback alarm

| No | Yes |


Configure outputs

Configuration > I/O allocation settings >

Analog outputs > Step controller 2

Any available I/O


Digital outputs > Step controller 2 step 1

Digital outputs > Step controller 2 step 2

Digital outputs > Step controller 2 step 3

Digital outputs > Step controller 2 step 4


Operational settings

Data & Settings > Temperature control > Heating

Min switch time

[60] s

Minimum time the step has to be inactive or active for a change to occur

Actual binary step

1..15

Indication of an active binary step

Hysteresis for switching step

[1] %

Decrease of the control signal for switching to the lower binary step


Operational overview

Data & Settings > Operation overview > Heating

Heating (SEQ-A)

__ %

Output of the sequence

Actual binary step

1..15

Indication of an active binary step

Step controller 2 step 1

On | Off

Run indication for each Digital output

Step controller 2 step 2

On | Off

Step controller 2 step 3

On | Off

Step controller 2 step 4

On | Off