Danfoss AK-PC 520 User manual

Principle
Dimensions
Instructions
AK-PC 520
RI8NM252 12-2009
Identication
084B8012
Danfoss 84B2330.11
NZ control PI or P control

2 Instructions RI8NM252 © Danfoss 12/2009 AK-PC 520
ENGLISH
Necessary connections
Terminals:
1-2 Supply voltage 24 V a.c.
4- 19 Relay outputs for either compressors, unloaders or fan mo-
tors
22-24 Alarm relay
There is connection between 22 and 24 in alarm situations
and when the controller is dead
27-28 24 V signal to start / stop of regulation
27-29 24 V signal from the safety circuit DO 1
27-30 24 V signal from the safety circuit DO 2
27-31 24 V signal from the safety circuit DO 3
27-32 24 V signal from the safety circuit DO 4
57-59 Suction pressure. Voltage signal from AKS 32R **
60-62 Condenser pressure. Voltage signal from AKS 32R **
Connections
Application dependent connections
20-21 AKD start/stop *
The relay cutin when the frequency converter have to
start.
37-38 Voltage signal to external condenser control
39-41 Possibility of connecting an external display type EKA 163
or display of Pc
42-44 Possibility of connecting an external display type EKA 163
for display of P0, or EKA 165 for operation and display of
P0
45-46 DI1 - Contact function for alarm signal
45-47 DI2 - Contact function for alarm signal
48-49 DI3 - Contact function for alarm signal
48-50 DI4 - Contact function for displacement of the suction
pressure reference or for alarm signal.
51-52 DI5 - Contact function for displacement of the condenser
pressure reference or for alarm signal.
51-53 Separate sensor Saux1. Sensor signal fra AKS 11, AKS 12 or
EKS 111
54-55 Out temperature (Sc3). Sensor signal from AKS 11, AKS 12
or EKS 111 (mounted if r33 =2 or 4)
54-56 Air temperature at condenser outlet. Sensor signal from
AKS 11, AKS 12 or EKS 111
Data communication
25-26 Mount only, if a data communication module has been
mounted.
For ethernet communication the plug connection RJ45
must be used. (LON FTT10 can also be connected in this
way.
It is important that the installation of the data communi-
cation cable be done correctly. Cf. separate literature No.
RC8AC.
All inputs are low-voltage.
All relay outputs may be
high-voltage.
If an output is used for an unloader it is
not neccessary to wire the belonging
safety circuit.
Ex. with an unloader on DO2 a connec-
tion on terminal 30 can be left out
*)
Relay DO9 may in special cases be recongurated.
Unloader
**)
• If the controller has to control only the comrpessor or the fans, respectively Pc and
P0 sensor can be dispensed
• In brine systems temperature measurement at terminals 57-58 and 60-61 may be
used instead of pressure measurement with AKS 32R. See also o06.
P0/Pc: AKS 32R:
1 = Black = +
2 = Blue = -
3 = Brown = s
Danfoss 84B2869.10
Compressor control
with temperature
o06 = 0
o81 = 1

AK-PC 520 Instructions RI8NM252 © Danfoss 12/2009 3
Capacity step
All capacity steps are presumed to be identical.
Coupling mode
Coupling mode 1 = sequential operation.
Coupling mode 2 = cyclic operation.
Couplings
When there is cyclic operation and connections with unloaders there
will in some capacity cutins and cutouts be overlappings where the
unloaders from either one compressor or another may be active.
In such cases the unloaders on the compressor with the lowest number
of hours will be cut in, and the others cut out.
The changeover will take place at 6-second intervals.
Compressor conguration when o61 =1 or 2 (This is where you can choose between the options shown.)
Setting "c16" will dene the conguration.
Setting "c08" will dene coupling mode.
Compressor connections Coupling
mode
Relay no. Set
"c08"
to
Set
"c16"
to
If the entire condenser capacity is to be controlled by
a frequency converter, AK-PC 520 must send an analog
signal about the required capacity (“c29”= 9).
The signal varies from 0 to 10 V. Signal and capacity
have the following context.
Condenser couplings
When the compressor relays have been established the turn
comes to the fan relays.
The rst vacant relay (DO1-DO5) will become the rst fan relay. It
will be followed by the subsequent relays.
Danfoss 84B2870.10

4 Instructions RI8NM252 © Danfoss 12/2009 AK-PC 520
Operation
The buttons on the display
When you want to change a setting, the upper and the lower
buttons will give you a higher or lower value depending on the
button you are pushing. But before you change the value, you
must have access to the menu. You obtain this by pushing the
upper button for a couple of seconds - you will then enter the
column with parameter codes. Find the parameter code you want
to change and push the middle button. When you have changed
the value, save the new value by once more pushing the middle
button.
EKA 165
To operate the controller and view the evaporation pressure.
If the lowermost key is pressed, the condensation pressure will
be shown briey in the display. (If regulation is based only on the
condensation pressure, the display will always show Pc).
During normal operation the light-emitting diodes in the display
will indicate where regulation is taking place.
Highest + second highest : ++Zone
Second highest : +Zone
"None" : Neutral zone
Second lowest : -Zone
Lowest+ second lowest : - - Zone
The other LEDs on the display will show the functions that are
active:
• Relays for compressors
• Relays for fans
• Input signals for the digital inputs
• The optimisation LED will light up when the reference is 2 K or
more over the set point.
EKA 163
If the condensation pressure is to be shown constantly, a display
without operating keys can be connected.
EKA 164
To operate the controller and view the evaporation pressure.
If the lowermost key is pressed, the condensation pressure will be
shown briey in the display.
Like the EKA 165, the LEDs in the display will show where the
regulation is located.
EKA 165
Data communication
If the controller is extended with data communication, the opera-
tion can be performed from a system unit.
The importance of the alarms that are sent can be dened with
the setting: 1 (High), 2 (Medium), 3 (Low) or 0 (No alarm).
Operation via external display
The values will be shown with three digits, and with a setting you
can determine whether the pressures are to be shown in SI units
(°C / bar) or US units (°F / psig.).
There are three options for the display.
Or short:
1. Push the upper button (long push) until a parameter is shown
2. Push one of the buttons and nd the parameter you want to
change
3. Push the middle button until the setting value is shown
4. Push one of the buttons and select the new value
5. Push the middle button again to conclude the setting
( A brief pushing wil show the active alarm codes.)
EKA 163
EKA 164

AK-PC 520 Instructions RI8NM252 © Danfoss 12/2009 5
Menu survey
To be continued
SW: 1.0x
Sequence
1. o61 must be set as the rst parameter. This parameter determines which of the two operating interfaces (application mode) are
activated. This must be set via the display keys. It cannot be set via data communication. (Active functions are shown below in shaded
elds.)
2. Quick- start
To get the system up and running quickly so that cooling can be commenced, start it by setting the following parameters (these pa-
rameters can only be set when the regulation is stopped, r12=0):
r23, r28 c08, c09, c16, c29, o06, o30, o75, o76, o81 and nally r12=1.
3. Once the regulation is under way, you can go through the other parameters and adjust them in situ.
Function Para-
meter
o61 = Min. Max. Factory
setting
1 2
Normal display
Shows P0 in EKA 165 (display with buttons) - °C P °C / bar
Shows Pc in EKA 163 - °C P °C / bar
P0 reference
Neutral zone r01 0.1°C / 0.1 bar 20°C /5.0 bar 4.0°C / 0.4 bar
Correction of signal from P0 sensor r04 -50°C /-5.0 bar 50°C / 5.0 bar 0.0
Select view; SI or US. 0=SI (bar /°C), 1=US (Psig /°F) r05 0 1 0
Start/Stop of regulation r12 OFF ON OFF
Reference oset for P0 (see also r27) r13 -50°C / -5.0 bar 50°C / 5.0 bar 0.0
Set regulation setpoint for P0 r23 -99°C / -1 bar 30°C / 60.0 bar 0.0°C / 3.5 bar
Shows total P0 reference
( r23 + various displacements) r24 °C / bar
Limitation: P0 reference max. value
(also applies to regulation with reference displacement) r25 -99°C / -1.0 bar 30°C / 60.0 bar 30.0°C / 40.0 bar
Limitation: P0 referencen min. value
(also applies to regulation with reference displacement) r26 -99°C / -1.0 bar 30°C / 40.0 bar -99.9°C / -1.0 bar
Displacement of P0 (ON=active“r13”) r27 OFF ON OFF
Pc reference
Set regulation setpoint for Pc r28 -25°C / 0.0 bar 75°C / 110.0 bar 35°C / 15.0 bar
Shows total Pc reference r29 °C / bar
Limitation: Pc referencen max. value r30 -99.9°C / -0.0 bar 99.9°C/130.0bar 55.0°C / 60.0 bar
Limitation: Pc referencen min. value r31 -99.9°C / 0.0 bar 99.9°C / 60.0 bar -99.9°C / 0.0 bar
Correction of signal from Pc sensor r32 -50°C / -5.0 bar 50°C / 5.0 bar 0.0
Pc reference variation.1 and 2 are PI-regulation
1: Fixed reference. “r28” is used
2: Variable reference. Outdoor temperature (Sc3) included in the refer-
ence
3: As 1, but with P-regulation (Xp-band)
4: As 2, but with P-regulation (Xp-band)
r33 1 4 1
Reference oset for Pc r34 -50°C / -5.0 bar 50°C / 5.0 bar 0.0
The mean temperature dierence across the condenser at maximum load
(dim tm K) r35 3.0 50.0 10.0
The mean temperature dierence across the condenser at the lowest
relevant compressor capacity (min tm K) r56 3.0 50.0 8.0
This is where you can see the actual pressure (P0) that is being measured
by the pressure transmitter. r57 °C / bar
This is where you can see the actual pressure (T0) that is part of the regu-
lation. From the sensor which is dened in “o81” r58 °C
Capacity
Min. ON time for relays c01 0 min 30 min. 0
Min. time period between cutins of same relay c07 0 min. 60 min 4
Denition of regulation mode
1: Sequential (step mode / FILO)
2: Cyclic (step mode / FIFO)
c08 1 2 1
If a regulation mode with unloaders is selected, the relay must be dened
to:
0: Cut in when more capacity is required
1: Cut out when more capacity is required
c09 0 1 0
Regulation parameter for + Zone c10 0.1 K / 0.1 bar 20 K / 2.0 bar 4.0 / 0.4 bar
Regulation parameter for + Zone c11 0.1 min 60 min 4.0

6 Instructions RI8NM252 © Danfoss 12/2009 AK-PC 520
To be continued
Regulation parameter for ++ Zone c12 0.1 min. 20 min 2.0
Regulation parameter for - Zone c13 0.1 K / 0.1 bar 20 K / 2.0 bar 4.0 / 0.3 bar
Regulation parameter for - Zone c14 0.1 min. 60 min 1.0
Regulation parameter for - - Zone c15 0.02 min. 20 min 0.5
Denition of compressor connections.
See options on page 3 c16 1 8 0
Denition of condenser:
1-4: Total number of fan relay
5-8: Not used
9: Only via analog output and start of frequency converter
10: Not used
11- 14: Total number of fan relays (1-4) which are to be connected with
alternating start-up.
c29 0/OFF 14 0
Cut in compressor capacity with manual control. See also “c32” c31 0% 100% 0
Manual control of compressor capacity (when ON, the value in“c31” will
be used) c32 OFF ON OFF
Pump down limit. Limit value where the last compressor is cut out. c33 -99.9°C / -1.0 bar 100°C / 60 bar 100°C / 60 bar
Proportinal band Xp for (P= 100/Xp) condenser regulation n04 0.2 K / 0.2 bar 40.0 K / 10.0 bar 10.0 K / 3.0 bar
I: Integration time Tn for condenser regulation n05 30 s 600 s 150
Cutin condenser capacity with manual control. See also “n53” n52 0% 100% 0
Manual control of condenser capacity (when ON, the value in“n52”will
be used) n53 OFF ON OFF
Start speed The voltage for the speed regulation is kept at 0V until the
regulation requires a higher value than the value set here. n54 0% 75% 20%
Min. speed. The voltage for the speed regulation switches to 0V when the
regulation requires a lower value than the value set here. n55 0% 50% 10%
Alarm
Delay time for a A32 alarm A03 0 min. 90 min. 0 min.
Low alarm and safety limit for P0 A11 -99°C / -1.0 bar 30°C / 40 bar -40°C / 0.5 bar
Delay time for a DI1 alarm A27 0 min. (-1=OFF) 999 min. OFF
Delay time for a DI2 alarm A28 0 min. (-1=OFF) 999 min. OFF
Delay time for a DI3 alarm A29 0 min. (-1=OFF) 999 min. OFF
Upper alarm and safety limit for Pc A30 -10 °C / 0.0 bar 200°C/200.0 bar 60.0°C / 60.0 bar
Upper alarm limit for sensor "Saux1" A32 1°C (0=OFF) 140°C OFF
Delay time for a P0 alarm A44 0 min. (-1=OFF) 999 min. 0 min.
Delay time for a Pc alarm A45 0 min. (-1=OFF) 999 min. 0 min.
Miscellaneous
Controllers address o03* 1 990
On/o switch (service-pin message) o04* - -
Access code o05 1 (0=OFF) 100 OFF
Used sensor type for Sc3, Sc4 and "Saux1"
0=PT1000, 1=PTC1000
2-7=variations with temperature sensor on P0 and Pc. See manual.
o06 0 7 (1) 0
Set supply voltage frequency o12 50 Hz 60 H 0
Manual control of outputs:
0: No override
1-10: 1 will cut in relay 1, 2 relay 2, etc.
11-18: Gives voltage signal on the analog output. (11 gives 1.25 V, and so
on in steps of 1.25 V
o18 0 18 0
P0 pressure transmitter’s working range - min. value o20 -1 bar 0 bar -1.0
P0 pressure transmitter’s working range - max. value o21 1 bar 200 bar 12.0
Use of DI4-input
0=not used. 1=P0 displacement. 2=alarm function. Alarm="A31" o22 0 2 0
Operating hours of relay 1 (value time 1000) o23 0.0 h 99.9 h 0.0
Operating hours of relay 2 (value time 1000) o24 0.0 h 99.9 h 0.0
Operating hours of relay 3 (value time 1000 o25 0.0 h 99.9 h 0.0
Operating hours of relay 4 (value time 1000) o26 0.0 h 99.9 h 0.0
Setting of refrigerant
1=R12. 2=R22. 3=R134a. 4=R502. 5=R717. 6=R13. 7=R13b1. 8=R23.
9=R500. 10=R503. 11=R114. 12=R142b. 13=User dened. 14=R32.
15=R227. 16=R401A. 17=R507. 18=R402A. 19=R404A. 20=R407C.
21=R407A. 22=R407B. 23=R410A. 24=R170. 25=R290. 26=R600.
27=R600a. 28=R744. 29=R1270. 30=R417A. 31=R422A.
o30 0 31 0
* this setting is only possible if data communication module is mounted in the controller

AK-PC 520 Instructions RI8NM252 © Danfoss 12/2009 7
Messages can be brought up on the display by briey pressing the
uppermost key. If there is more than one alarm, they can be scrolled
through
Factory setting
If you need to return to the factory-set values, it can be done in this way:
- Cut out the supply voltage to the controller
- Keep the upper and the lower button depressed at the same time as
you reconnect the supply voltage
Use of DI5-input
0=not used. 1=Pc displacment. 2=alarm function. Alarm="A32" o37 0 2 0
Pc pressure transmitter’s working range - min. value o47 -1 bar 0 bar -1.0
Pc pressure transmitter’s working range - max. value o48 1 bar 200 bar 34.0
Read temperature at sensor "Saux1" o49 °C
Operating hours of relay 5 (value time 1000) o50 0.0 h 99.9 h 0.0
Operating hours of relay 6 (value time 1000) o51 0.0 h 99.9 h 0.0
Operating hours of relay 7 (value time 1000) o52 0.0 h 99.9 h 0.0
Operating hours of relay 8 (value time 1000) o53 0.0 h 99.9 h 0.0
Selection of application
1. Show temperature in display
2: Show pressure in display
o61 1 2 1 2 1
Function for relay output DO9:
0. Start / stop of speed regulation
1. Inject on signal for evaporator control
2. Boost ready (at least one compressor is on)
3. Start /stop of condenser fan
o75 0 3 0
Function for relay output DO10:
0. Alarm relay
1. Start / stop of condenser fan
o76 0 1 0
Denition of alarm message at DI1 signal:
0. Not used
1. Fan failure (A34)
2. DI1 alarm (A28)
o78 0 2 0
Settings at water cooler application
Denition of signal input to the compressor regulation when regulation
with temperature signal:
0. Temperature sensor on 57-58
1. Temperature sensor on Saux
2. Temperature sensor on Sc4
If frost protection is required, the setting must be 1 or 2.
o81 0 2 0
Display connection
O: EKA 164
On: EKA 165 (extended display with light-emitting diodes)
o82 O On O
Service
Status on DI1 input u10
Status on DI2 input u37
Read temperature at sensor "Sc3" u44 °C
Read temperature at sensor "Sc4" u45 °C
Status on DI3 input u87
Status on DI4 input u88
Status on DI5 input u89

8 Instructions RI8NM252 © Danfoss 12/2009 AK-PC 520
The controller can give the following messages
E1 Error
message
Fault in controller
E2 Regulation is outside the range, or the control
signal is defective
A2 Alarm
message
Low P0
A11 Refrigerant not selected
A17 High Pc
A19 Compressor 1 error The actual compressors
safety circuit is
interrupted.
That is to say the signal
is missing on one of the
terminals 29-32
A20 Compressor 2 error
A21 Compressor 3 error
A22 Compressor 4 error
A27 Room temperature alarm (Saux1 temp.)
A28 DI 1 alarm. Terminal 46 interrupted
A29 DI 2 alarm. Terminal 47 interrupted
A30 DI 3 alarm. Terminal 49 interrupted
A31 DI 4 alarm. Terminal 50 interrupted
A32 DI 5 alarm. Terminal 52 interrupted
A34 Fan alarm. There is no signal on DI1 input
A45 Regulation stopped
S0 Status
message
Regulation
S2 Wait for “c01”
S5 Wait for “c07”
S8 Wait for “c11” or “c12”
S9 Wait for “c14” or “c15”
S10 Refrigeration stopped by the internal or external
start/stop function
S25 Manual control of outputs
S34 Safety cutout. Setting A30 is exceeded or all
safety inputs (29-32) are open
PS Info Access code is required before you have access to
the settings

AK-PC 520 Instructions RI8NM252 © Danfoss 12/2009 9
Nødvendige tilslutninger
Klemme:
1-2 Forsyningsspænding 24 V a.c.
4- 19 Relæudgange til enten kompressorer, aastninger eller
ventilatormotorer
22-24 Alarmrelæet
Der er forbindelse imellem 22 og 24 i alarmsituationer, og
når regulatoren er spændingsløs.
27-28 24 V signal til start / stop af reguleringen
27-29 24 V signal fra sikkerhedskredsen DO 1
27-30 24 V signal fra sikkerhedskredsen DO 2
27-31 24 V signal fra sikkerhedskredsen DO 3
27-32 24 V signal fra sikkerhedskredsen DO 4
57-59 Sugetryk. Spændingssignal fra AKS 32R **
60-62 Kondensatortryk. Spændingssignal fra AKS 32R **
Tilslutninger
Applicationbestemte tilslutninger
20-21 AKD start/stop *
Relæet slutter når frekvensomformeren skal starte.
37-38 Spændingssignal til ekstern kondensatorstyring
39-41 Mulighed for at tilslutte et eksternt display type EKA 163
(Pc-visning)
42-44 Mulighed for at tilslutte et eksternt display type EKA 163
til P0-visning, eller EKA 165 til betjening og P0-visning
45-46 DI1 - Kontaktfunktion til alarmsignal
45-47 DI2 - Kontaktfunktion til alarmsignal
48-49 DI3 - Kontaktfunktion til alarmsignal
48-50 DI4 - Kontaktfunktion til forskydning af sugetryksreferen-
cen eller til alarmsignal.
51-52 DI5 - Kontaktfunktion til forskydning af kondensatortryks-
referencen eller til alarmsignal.
51-53 Separat føler Saux1. Følersignal fra AKS 11, AKS 12 eller EKS
111
54-55 Udetemperatur (Sc3). Følersignal fra AKS 11, AKS 12 eller
EKS 111 (monteres hvis r33 = 2 eller 4).
54-56 Lufttemperatur ved kondensatorens afgang. Følersignal fra
AKS 11, AKS 12 eller EKS 111
Datakommunikation
25-26 Monteres kun, hvis der også er monteret et datakommuni-
kationsmodul.
Hvis det er en ethernetkommunikation skal stiktilslut-
ningen RJ45 anvendes. (LON FTT10 kan også tilsluttes på
denne måde.)
Det er vigtigt, at installationen af datakommunikations-
kablet udføres korrekt.
Se separat litteratur nr. RC8AC..
Alle indgange er lavvolt.
Alle relæudgange kan
være højvolt.
Hvis en udgang anvendes til en aast-
ning, er det ikke nødvendigt, at fortråde
den tilhørende sikkerhedskreds.
Fx. ved en aastning på DO2 kan en
tilslutning på klemme 30 udelades
**)
• Hvis regulatoren kun skal styre kompressorer eller kun skal styre ventilatorer, kan Pc
henholdsvis P0 føleren undværes.
• På brineanlæg kan der i stedet for trykmåling med AKS 32R anvendes temperatur-
måling på klemme 57-58 og 60-61. Se også o06.
Aastning
*)
DO9 kan i specialtilfælde omkongureres.
P0/Pc: AKS 32R:
1 = Sort = +
2 = Blå = -
3 = Brun = s
Danfoss 84B2869.10
Kompressorregulering
efter temperatur
o06 = 0
o81 = 1
DANSK

10 Instructions RI8NM252 © Danfoss 12/2009 AK-PC 520
Kompressortilslutninger Koblings-
måde
Relæ nr. Indstil
"c08"
til
Indstil
"c16"
til
Kapacitetstrin
Alle kapacitetstrin forudsættes at være lige store.
Koblingsmåde
Koblingsmåde 1 er sekventiel drift.
Koblingsmåde 2 er cyklisk drift.
Omkoblinger
Ved cyklisk drift og tilslutninger med aastninger, vil der ved
nogle kapacitetsindkoblinger være overlapninger, hvor aastnin-
gerne fra enten den ene eller den anden kompressor kunne være
aktiv.
I disse tilfælde vil aastningerne på kompressoren med det lave-
ste timetal blive koblet ind, og de andre blive koblet ud. Omkob-
lingen vil ske med et interval på 6 sekunder.
Kompressorkonguration når o61 = 1 eller 2 (Her kan du vælge imellem de viste muligheder.)
Indstilling "c16" vil denere kongurationen.
Indstilling "c08" vil denere koblingsmåden.
Hvis hele kondensatorkapaciteten skal styres af en frekvensom-
former, skal AK-PC 520 afgive et analogt signal om den ønskede
kapacitet ("c29"=9).
Signalet varierer fra 0 til 10 V. Signal og kapacitet har følgende sam-
menhæng.
Kondensatorkoblinger
Når kompressorrelæerne er lagt fast, kommer turen til ventilator-
relæerne.
Det første ledige relæ (DO1-DO5) bliver det første ventilatorrelæ.
Derefter kommer de efterfølgende.
Danfoss
84B2870.10