Design Of A Compressor And Condenser Control; Procedure; Sketch; Compressor And Condenser Functions - Danfoss ADAP-KOOL AK-PC 783 Design Manual

Design of a compressor and condenser control

Procedure:

1. Make a sketch of the system in question
2. Check that the controller's functions cover the required
application
3. Consider the connections to be made
4. Use the planning table. / Note down the number of connections
./ add up
5. Are there enough connections on the controller module? – If
not, can they be obtained by changing an ON/OFF input signal
from voltage signal to contact signal, or will an extension
module be required?
6. Decide which extension modules are to be used
7. Check that the limitations are observed
8. Calculate the total length of modules
9. The modules are linked together
10. The connection sites are established
11. Draw a connection diagram or a key diagram
12. Size of supply voltage/transformer
1

Sketch

Make a sketch of the system in question.
2

Compressor and condenser functions

Application
Regulation of a compressor groups on MT and LT
Regulation of a condenser groups on MT
Regulation of a cascade heat exchanger
Regulation of compressor capacity
Control sensor = P0
PI-regulation
Max. number of compressors
Max. number of unloaders each compressor
Identical compressor capacities
Different compressor capacities
Speed regulation of 1 or 2 compressors
Run time equalisation
Min. restart time
Min. On-time
Liquid injection in suction line
Liquid injection in cascade heat exchanger
Liquid injection in screw compressor
External start/stop of compressors
34
AK-PC 783
x
x
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4 MT+ 4 LT
5 MT + 3 LT
3
x
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x
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x
Capacity controller RS8GN202 © Danfoss 11-2013
Follow these 12
steps
Oil management
Oil injection in compressor. Shared or individual
Receiver pressure control
Monitoring of oil level in receiver
Management of oil level in oil separator
Reset of oil management
Cutout of compressors at oil failure
Safety relays during forced compressor control
Suction pressure reference
Override via P0 optimization
Override via "night setback"
Override via "0 -10 V signal"
Regulation of condenser capacity
Control sensor = PcMT
Step regulation
Max. number of steps
Speed regulation
Step and speed regulation
Speed regulation first step
x
x
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x
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8
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x
AK-PC 783