Water cooling is adjusted by a valve that is controlled by the analog output and digital output for starting and stopping the pump.


Functionality of the pump control includes periodic pump exercise. The Access also monitors if the pump is functional over the digital input. The digital input can be configured for the pump run or active alarm indication.


The table below shows a configuration example of the water cooler and pump control with alarm monitoring.



Variable

Available options & Selection

Note


Sequence selection

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

Sequence for cooling

| SEQ-A | SEQ-B | SEQ-C Cooling |...|



Sequence settings

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

Type of sequence

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


Type of cooler

| Water | DX | DX with exchanger control |


Pump control

| No | Yes |


Pump running mode

| Always running | Auto |


Type of feedback

| None | Alarm | Run indication |


Digital start output

| 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 > Cooling

P-band

10 oC

PID settings for the sequence

I-time

100 s

D-time

0 s


Hardwired interface to the pump & valve

Configuration > I/O allocation settings >

Digital inputs > Feedback cooling (SEQ-C)

Any available I/O

Pump control and feedback signals

Digital outputs > Cooling pump (SEQ-C)

Analog outputs > Cooling (SEQ-C)

Cooling sequence output (input for valve)


Pump control settings

Data & Settings > Temperature control > Cooling

Pump stop delay

5 min

Delay for switching off DO: Cooling pump (SEQ-C)

Pump-kick hour

15 h

Daily exercise run of the pump starts at 15h

Valve flowrate at fully open position

100.00 l/s

Value used for internal calculation


Graphical representation

Flowchart


35% - indication of sequence output


On - indication of pump status