Danfoss AK-PC 420 User Manual Download | Manualshive

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Capacity controller for dry cooler

AK-PC 420

User Guide

ADAP-KOOL

®

Refrigeration control systems

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Summary of Contents for AK-PC 420

Page 1: ...Capacity controller for dry cooler AK PC 420 User Guide ADAP KOOL Refrigeration control systems...

Page 2: ...cooler Outdoor temperature sensor Sc3 located by the air inlet to the dry cooler Either S7 Pc or S8 can be used as a regulation sensor Functions Three way valve control Speed regulation or step by st...

Page 3: ...rine condensation pressure Pc as regula tion sensor and the fan capacity is controlled either in steps or via speed control For PI control the use of the S7 and S8 sensors is optional but they should...

Page 4: ...the frequency converter 50 of the ana logue output signal is always used for the three way valve i e if the analogue output signal is set at 0 10V 0 5 V is used for the three way valve The frequency c...

Page 5: ...the signal and emit an alarm The associated relay output will not be disconnected The reason is that fans are often connected in pairs but with one single safety circuit If there is a fault in one fan...

Page 6: ...enabled in two ways Digital input HP safety When the digital input is connected full capacity is cut in to both fans and three way valve An alarm is emitted at the same time The capacity remains cut...

Page 7: ...troller can perform a switching of the pumps in the event of a lack of flow however the pump switch will only be performed when the delay time on the alarm has expired Depending on whether the pump sw...

Page 8: ...oor temperature If there is a heat recovery signal the reference will switch to the preset set point in r64 Setting 1 and 2 operate with a PI regulation but if the system is unstable and the PI regula...

Page 9: ...band xp for valve regulation P 100 Xp If the Xp value is increased the regulation becomes steadier n04 Valve Xp K I Integration time Tn for valve regulation If the Tn value is increased the regulatio...

Page 10: ...ues must be set in bar if display in C has been selected And in psig if F has been selected If the values are to be set from the AKM programme they must be set in bar Pc Min value o47 PcMinTrsPres Pc...

Page 11: ...dress is sent to the gateway when the menu is set in pos ON o04 Access code If the settings in the controller are to be protected by a numerical code you can set a numerical value between 0 and 100 If...

Page 12: ...ternal switch A45 Stand by A77 Interrupted signal on input Flow switch while pump 1 was operating A77 Pump 1 fault A78 Interrupted signal on input Flow switch while pump 2 was operating A78 Pump 2 fau...

Page 13: ...4 Pc S7 5 and 6 S8 S7 EKA 163 If the alternative temperature is to be shown constantly a display without operating keys can be connected Data communication If the controller is extended with data comm...

Page 14: ...0 0 V unlinear c34 1 4 1 Proportional band Xp for P 100 Xp valve regulation n04 0 2 K 40 0 K 10 0 K I Integration time Tn for valve regula tion n05 30 s 600 s 120 Cutin condenser capacity with manual...

Page 15: ...al signal u96 Read the value of the analogue output in V u97 Read temperature at sensor S7 u98 The controller can give the following messages E1 Error message Fault in controller E2 Regulation is outs...

Page 16: ...for alarm signal 48 50 HP safety contact function for receiving of high pressure safety signal 51 52 Heat recovery Contact function for receive of signal to start of heat recovery 51 53 S7 sensor Sens...

Page 17: ...tion Possible to connect a data communication module Environments 0 55 C during operation 40 70 C during transport 20 80 Rh not condensing No shock influence vibrations Enclosure IP 20 Weight 0 4 kg M...

Page 18: ...y in the example no consideration is given to any possible overriding with external reference signal 0 10 V 1 PI regulation with fixed reference In PI regulation the controller will make sure that the...

Page 19: ...he entire fan capacity is controlled by speed regulation the capacity will be indicated on the broken line 4 P regulation with floating reference As point 2 but with P regulation the actual regulation...

Page 20: ...d to 99 9 C Raising lowering of the reference takes place via a ramp function defined at r65 RefRamp The capacity of the three way valve is controlled via regulation parameters n04 Valve Xp and n05 va...

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