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Capacity Controller

AK-PC 351

User Guide

ADAP-KOOL® Refrigeration Control System

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Summary of Contents for AK-PC 351

Page 1: ...Capacity Controller AK PC 351 User Guide ADAP KOOL Refrigeration Control System ...

Page 2: ...nal from automatic safety control external start stop night signal general alarm Relay outputs max 5 pcs Connection of compressors condenser fans alarm relay Solid state outputs max 1 pcs Control of bypass on a digital scroll or for controlling unloader on a stream compressor If the output is not used for this func tion it can be used as ordinary relay output Analogue outputs max 2 pcs Speed contr...

Page 3: ...aintain the pressure within the neutral zone only where the compressor has variable capacity When the pressure is higher than the reference a half neutral zone cut in of the next compressor arrow up is permitted When the pressure is lower than the reference a half neutral zone cut out of a compressor arrow down is permitted When the pressure is within the neutral zone the process will continue wit...

Page 4: ...ed reference Variable reference which follows the outdoor temperature When the outdoor temperature drops the reference will drop by a corresponding amount This variable reference requires the installation of an Sc3 outdoor temperature sensor The sensor must be positioned so that it registers the correct outdoor temperature In other words it must be shielded from direct sunlight and located near th...

Page 5: ...an AI input A signal can be received from a Pt 1000 Ohm sensor on the pres sure pipe If the temperature nears the set max temperature the capacity of the compressor will be increased so that the compressor can cool down itself The compressors will be stopped if the temperature reaches up to the set max temperature value Sensor failure If lack of signal from one of the connected temperature sensors...

Page 6: ...examples below 1 condenser group 1 suction groupe 1 suction group and 1 condenser group When an alarm is sent from the controller you must advance to this display to see the alarm text Status either 1 suction group or 1 condenser group or Both suction group and condenser group Parameters Access to the menus requires pass word Level 1 Only view 100 Level 2 Change values 200 Level 3 Change configura...

Page 7: ...be led through a series of settings after which the controller will be ready for start Image 1 of 22 is displayed here The following options are available here Comp Cond suction group and condenser Condenser ondenser only Compressor suction group only None Main Menu The first setting is the Plant type When the Plant type has been selected it will al low several settings to be made For example Cont...

Page 8: ...al set up and must not be subsequently changed Temp press Fac Saturated Mains frequency Frequency Set the net frequency 50 Hz 60 Hz Fac 50 Hz Alarm output Alarm relay Define an alarm relay here that will be activated in the event of an alarm 1 Select the alarm priority that will activate the relay No relay Critical alarms Critical and serious alarms All alarms Select whether the relay will be acti...

Page 9: ...ax 80 C 50 0 bar Fac 80 C 40 0 bar Min Reference Set the lowest permissible regulation reference here Min 80 C 1 0 bar Max 25 C 40 0 bar Fac 80 C 1 0 bar PI control selection Set how quickly the PI regulation must react here 1 slowly 10 very quickly For Custom setting 0 the special settings options will open i e Kp Tn and time settings around the neutral zone These options are only for trained sta...

Page 10: ...r capacity for the first compressor it is defined under Compressor mode That is the capacity of either a Digital scroll Stream Variable speed Min 1 kW Max 100 kW Fac 1 kW Comp size Set the nominal compressor capacity of the other compressors For single step only All are of the same size including the first For unloader all All are of the same size including the first Min 1 kW Max 100 kW Fac 1 kW V...

Page 11: ...rect operation Min 0 min Max 60 min Fac 0 min Comp Min OFF Min Off time for remaining compressors Set the forced Off time during which the compressor must be off before it can be switched on again The setting is to prevent incorrect operation Min 0 min Max 30 min Fac 0 min Comp Restart Min period of time for restarting remaining compressors Set the forced Off time during which the compressor must ...

Page 12: ...d set in MAN OFF AUTO Fac AUTO Min 0 Max 100 Setpoint Enter the set point for the condenser regulation here Also set a value if regulating with a fluid reference set point value used in the event of an outside temperature sensor error Min 25 C 1 0 bar Max 90 C 159 bar Fac 35 C 15 0 bar Sc3 offset Temperature offset for regulation with fluid reference Regulation reference Sc3 measurement Sc3 offset...

Page 13: ...0 bar Max 30 C 159 bar Fac 40 C 0 5 bar Po S4 Max alarm Alarm limit for high Po If a high value is registered an alarm will be generated Min 30 C 1 0 bar Max 100 C 159 bar Fac 100 C 5 0 bar Po S4 Max delay Delay time for issuing a Po max alarm Min 0 min Max 240 min Fac 5 min Pc max limit Safety limit for max Pc If Pc exceeds the value set here minus 3 K the entire condenser capacity will cut in an...

Page 14: ...unit All pressure readings and settings are in relative pressure Select bar or PSIG Bar PSIG Fac bar Temperature units Temperature unit Select C or F C F Fac C Screen saver time Screen saver time If no buttons have been pushed for a specific period of time the light in the display will be minimised The light level will be restored upon renewed activity Min 1 min Max 60 min Fac 1 min User logout ti...

Page 15: ...the sensor s upper pressure A type AKS 2050 pressure transmitter for high pressure emits a signal as an AKS 32R All measurements can be calibrated if necessary I O Status Digital outputs 1 6 Status of on off outputs Here you can see if the function is on or off PWM for a digital scroll must be connected to DO6 The pulsing signal will be able to be seen as an alternating on off signal Digital input...

Page 16: ...been selected Refrigerant not set Normal Output in manual mode An output is set in manual mode Output in MAN mode Normal IO configuration error Not all inputs and outout functions have been assigned to hardware Inputs or outputs can not be set Normal GA Alarm text Alarm on general alarm input DI 8 DI input Gen Alarm alarm text depend upon configured text General alarm Normal Suction alarms Po S4 L...

Page 17: ...ts DO6 Compressor start and unloaders Fans Alarm Digital inputs DI1 DI8 are estab lished on the following inputs DI1 4 Compressor safety input DI5 Fan safety input DI6 External Main switch Start Stop DI7 LP safety switch or Night status DI8 HP safety switch or General alarm input Analog outputs AO1 AO2 are es tablished on the following outputs AO1 Compressor speed control AO2 Condenser speed contr...

Page 18: ...sor S7 Pt 1000 ohm Pressure transmitters Ratiometric 10 90 of supply AKS 32R AKS 2050 Signal 1 5 V AKS 32 Current 0 20 mA 4 20 mA AKS 33 supply 12 V DI Digital switch inputs 8 pcs DI1 DI8 The connection may be a shut down or interruption function Select what is to be activated during configuration DI1 4 Safety circuits compressor 1 2 3 and 4 DI5 Safety circuits condenser fans DI6 External Main Swi...

Page 19: ...is max capacity Sd monitoring When regulating with Sd monitoring the controller will increase capacity if the temperature nears the Sd limit This will result in better cooling of the digital scroll compressor The capacity from the digital scroll compressor Only DO6 Refrigeration No refrigeration Stream compressor The PWM signal can also be used to control one stream compressor with one unloader va...

Page 20: ...cs Solid State PWM for scroll unload Imax 0 5A Imin 50 mA Leak 1 5 mA 2 Voltage outputs 0 10 V d c Ri 1kohm Data communication Modbus for AK SM 800 Environments 20 60 C During operations 40 70 C During transport 20 80 Rh not condensed No shock influence vibrations Density IP 20 Weight 0 2 kg Mounting DIN rail Connection terminals max 2 5 mm2 multi core Approvals EU Low Voltage Directive and EMC de...

Page 21: ...AK PC 351 User Guide RS8GZ302 Danfoss 2015 06 21 Ordering Type Function Operation Supply voltage Code no AK PC 351 Capacity controller With buttons and display 24 V 080G0289 ...

Page 22: ...marks of Danfoss A S All rights reserved Installation considerations Accidental damage poor installation or site conditions can give rise to malfunctions of the control system and ultimately lead to a plant breakdown Every possible safeguard is incorporated into our products to prevent this However a wrong installation for example could still present problems Electronic controls are no substitute ...

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