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Access 4.x |
Water cooling configuration example |
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 |
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Sequence selection |
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Configuration > Functions > Function activation > Heating/Cooling sequence setup |
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Sequence for cooling |
| SEQ-A | SEQ-B | SEQ-C Cooling |...| |
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Sequence settings |
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Configuration > Functions > Function activation > Heating/Cooling sequence setup > Cooling |
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Type of sequence |
|Cooling | Exchanger | Heating | Damper | Fan setpoint compensation | |
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Type of cooler |
| Water | DX | DX with exchanger control | |
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Pump control |
| No | Yes | |
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Pump running mode |
| Always running | Auto | |
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Type of feedback |
| None | Alarm | Run indication | |
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Digital start output |
| No | Yes | |
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Sequence output when recirculation/support |
| 0% | 100% | Auto | |
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Sequence output min limit |
0% |
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Sequence output max limit |
100% |
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Sequence output when the unit is stopped |
0% |
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PID Settings |
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Configuration > PID controllers > Cooling |
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P-band |
10 oC |
PID settings for the sequence |
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I-time |
100 s |
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D-time |
0 s |
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Hardwired interface to the pump & valve |
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Configuration > I/O allocation settings > |
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Digital inputs > Feedback cooling (SEQ-C) |
Any available I/O |
Pump control and feedback signals |
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Digital outputs > Cooling pump (SEQ-C) |
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Analog outputs > Cooling (SEQ-C) |
Cooling sequence output (input for valve) |
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Pump control settings |
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Data & Settings > Temperature control > Cooling |
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Pump stop delay |
5 min |
Delay for switching off DO: Cooling pump (SEQ-C) |
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Pump-kick hour |
15 h |
Daily exercise run of the pump starts at 15h |
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Valve flowrate at fully open position |
100.00 l/s |
Value used for internal calculation |
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Graphical representation |
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Flowchart |
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35% - indication of sequence output On - indication of pump status |
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