Access 5.x

Rotary exchanger configuration example


Rotational speed of the rotary heat exchanger is controlled either via internal data bus or analog signal (in hardwired rotary drive option).


* Access 5.3 and later versions come with possibility to configure two exchanger rotation guards for monitoring double rotor AHUs. In such configuration one sensor per rotor is used.

Failure of either is indicated by the alarm 3071 Rotary exchanger alarm 2 while simultaneous failure of both triggers alarm 3070 Rotary exchanger alarm.


The table below shows a configuration example of the hardwired rotary exchanger control with alarm monitoring.

Variable

Available options & Selection

Note


Sequence selection

Configuration > Functions > Function activation > Heating/Cooling sequence setup

Sequence for exchanger

| SEQ-A | SEQ-B Exchanger |...|



Sequence settings

Configuration > Functions > Function activation > Heating/Cooling sequence setup > Exchanger

Type of sequence

|Cooling | Exchanger | Heating | Damper | Fan setpoint compensation |


Type of exchanger

| Rotary | Plate | Liquid |


Digital start output

| No | Yes |


Exchanger alarm

| No | Yes | Yes - 2x Feedback* |

| No | - No rotation sensor is connected to the Digital input of the Access controller


| Yes | - One sensor is connected


| Yes - 2x Feedback | - Two sensors are connected to two separate Digital Inputs*

Type of defrosting

| None | Temperature monitoring |


Frost prevention rotating exchanger

| No | Yes |


Sequence output when recirculation/support

| 0% | 100% | Auto |


Sequence output min limit

0%


Sequence output max limit

100%


Sequence output when the unit is stopped

0%



PID Settings

Configuration > PID controllers > Exchanger

P-band

10 oC

PID settings for the sequence

I-time

100 s

D-time

0 s


Hardwired interface to the Exchanger controller

Configuration > I/O allocation settings >

Digital inputs > Rotary exchanger alarm

Any available I/O

Inputs related to the alarms

3070 Rotary exchanger alarm and

3071 Rotary exchanger alarm 2

Digital inputs > Rotary exchanger alarm 2*

Analog outputs > Exchanger (SEQ-B)

Sequence output to the exchanger controller


Sequence control settings

Data & Settings > Temperature control > Exchanger

Start delay exchanger

0 s


100% exchanger at start up

2 s



Graphical representation

Flowchart


75% - indication of sequence output