Danfoss AK-PC 530 User manual

Capacity controller
AK-PC 530
User Guide
ADAP-KOOL®Refrigeration control systems

2 Manual RS8EJ302 © Danfoss 05-2010 AK-PC 530
Introduction
Application
The controller is used for capacity regulation of compressors or
condensers in small refrigerating systems.
Numbers of compressors and condensers can be connected, as
required.
There are eight outputs and more can be added via an external
relay module.
Advantages
• Patented neutral zone regulation
• Many possible combinations for compressor constellations
• Sequential or cyclic operation
• Possibility of suction pressure optimisation via the data commu-
nication
Regulation
Regulation is based on signals from one pressure transmitter for
the compressor regulation and one pressure transmitter for the
condenser regulation plus one temperature sensor for the air
temperature before the condenser.
The two pressure transmitters can be replaced by two
temperature sensors when regulation has to be carried out on
brine systems.
• Pressure regulation P0 (pack)
• Temperature regulation Sx (chiller)
• Pressure regulation Pc (pack / chiller)
• Pressure regulation with variable reference (Sc3)
Functions
• Relays for compressor and condenser regulation
• Voltage output for capacity regulation of condenser
• Status inputs. An interrupted signal indicates that the safety
circuit has been activated and the respective circuit stopped
• Contact inputs for indication of alarms
• Contact inputs for displacement of references or for indication of
alarms
• Alarm relay
• External start/stop of regulation
• Possibility of data communication
Operation
All operation takes place either via data communication or via
connection of a display type EKA 164 or EKA 165.
Combinations
The controller has ten relay outputs two of which have been
reserved for the alarm function and for the ”VLT start/stop”
function.
For a start relays are reserved for compressor capacities starting
from DO1, DO2, etc.
The remaining relays up to and including DO8 will then be
available for fans. If more are required, one or more relay modules
type EKC 331 with max. eight steps can be connected. The signals
to these modules are to be taken from the controller’s analog
output. Another solution could be that the fan speed is controlled
via the analog output and a frequency converter.
If the alarm function and the ”AKD start/stop” function are left out,
all ten relay outputs may be used for compressors and fans (but
max. eight for compressors and max. eight fans).
Compressors and unloaders can
be combined in various ways. Cf.
survey on page 11.

AK-PC 530 Manual RS8EJ302 © Danfoss 05-2010 3
Sequential (rst in - last out)
The relays are here cut in in sequence – rst relay number 1, then
2, etc.
Cutout takes place in the opposite sequence, i.e. the last cut-in
relay will be cut out rst.
Cyclic (rst in - rst out)
The relays are coupled here so that the operating time of the
individual relays will become equalised.
At each cutin the regulation scans the individual relays’timer,
cutting in the relay with least time on it.
At each cutout a similar thing happens. Here the relay is cut out
that has most hours on the timer.
If capacity regulation is carried out on two compressors with one
unloader each, the following function can be used:
Relays 1 and 3 are connected to the compressor motor.
Relays 2 and 4 are connected to the unloaders.
Relays 1 and 3 will operate in such a way that the operating time
for the two relays will become equalised.
Rx = random relay
h = number of hours
C = compressor, L = Unloader
Function
Capacity regulation
The cut-in capacity is controlled by signals from the connected
pressure transmitter/temperature sensor and the set reference.
Outside the reference a neutral zone is set where the capacity will
neither be cut in nor out.
Outside the neutral zone (in the hatched areas named +zone and
-zone) the capacity will be cut in or out if the regulation registers a
change of pressure“away” from the neutral zone. Cutin and cutout
will take place with the set time delays.
If the pressure however “approaches”the neutral zone, the con-
troller will make no changes of the cut-in capacity.
If regulation takes place outside the hatched area (named ++zone
and --zone), changes of the cut-in capacity will occur somewhat
faster than if it were in the hatched area.
Cutin of steps can be dened for either sequential, cyclic, binary or
"mix & match" operation.

4 Manual RS8EJ302 © Danfoss 05-2010 AK-PC 530
Suvey of functions
The total function content is shown below – not all functions are present at the same
time. The setting of o61 determines which functions are present.
The menu overview on page 14 shows the various functions and settings.
Function
Para-
meter
Parameter by operation via
data communication
Normal display
If the two displays are mounted:
P0 will be shown on EKA 165 (the one with buttons)
Pc will be shown on EKA 163. Both readouts will be in temperature or in bar.
P0 °C or P0 b
Pc °C or Pc b
Compressor regulation reference Compressor control
P0 setpoint
Regulation is based on the set value plus an oset, if applicable. An oset can be cre-
ated from night setback r13 and/or from a system units override function.
r23 P0Set Point °C / P0Set Point b
Oset
The set reference may be displaced with a xed value when a signal is received at the
DI4 input or from the function "Night setback" (r27).
(Cf. also Denition of DI4 input).
r13 Night oset
Night setback
OFF: No change of the reference
ON: Oset value forms part of the reference
r27 NightSetBack
Reference
The regulation reference is shown here
r24 P0 ref. °C / P0 ref. b
Set point limitation
With these settings the setpoint can only be set between the two values.
(This also apply if regulation with displacements of the reference).
Max. permissible setpoint value. r25 P0RefMax °C / P0RefMax b
Min. permissible setpoint value. r26 P0RefMin °C / P0RefMin b
Neutral zone
There is a neutral zone around the reference. See also page 3.
r01 Neutral zone
Correction of pressure measurement
An oset adjustment of the registered pressure can be made.
r04 AdjustSensor
Unit
Here you can select whether the display is to indicate in SI units or US units.
0: SI (°C / bar)
1: US (°F / psig)
r05
(In AKM onlySI (bar and °C) is used,
whatever the setting)
Start/stop of refrigeration
With this setting the refrigeration can be started and stopped. Start/stop of refrigera-
tion may also be performed with an external contact function connected to the input
named “ON input”. (The input must be wired).
r12 Main Switch
Condenser regulation reference Condenser control
Pc setpoint
Regulation is based on the set value plus an oset, if applicable. An oset can be cre-
ated via the “r34”function and/or from a system units override function.
r28 PcSet Point °C / PcSet Point b
Oset
The set reference may be displaced with a xed value when a signal is received at the
DI5 input. (Cf. also Denition of DI5 input).
r34 PcRefOset
Pc reference variation. See also page 22
Regulation with setting 1 (or 2 if the reference is to vary with the outdoor tempera-
ture) will give the best regulation if the system is in balance. But if a lot of condenser
steps are cut in and out and the compressor capacity often becomes low, it will be
necessary to select setting 3 instead (or 4, if there is regulation with the outdoor tem-
perature). (Settings 3 and 4 will generally be preferable if a Pc-oset at max. compres-
sor capacity can be accepted).
1: No change of the reference. Regulation based on set setpoint. And oset with the
DI5 function is allowed.
2: Outdoor temperature forms part of the reference. The outdoor temperature is
measured with Sc3. When the outdoor temperature drops one degree, the reference
is lowered one degree.
Here is oset with the DI5 function not allowed. At DI5 signal the reference will
change to the set setpoint.
Setting 1 and 2 operate with a PI regulation, but if the system is unstable and the PI
regulation not satisfactory the I element may be left out, so that the controller will be
with P regulation only.
3: As 1, but with P regulation (xp-band)
4: As 2, but with P regulation (xp-band)
r33 Pc mode

AK-PC 530 Manual RS8EJ302 © Danfoss 05-2010 5
Condenser reference
The regulation reference is shown here.
r29 Pc ref. °C / Pc ref. b
Set point limitation
With these settings the setpoint can only be set between the two values.
(This also applies to regulations where the Xp band lies above the reference).
Max. permissible setpoint value. r30 PcRefMax °C / PcRefMax b
Min. permissible setpoint value. r31 PcRefMin °C / PcRefMin b
Correction of pressure measurement
An oset adjustment of the registered pressure can be made.
r32 AdjustSensor
Dimensioning temperature Dim tm
The mean temperature dierence across the condenser at maximum load (tm dier-
ence at max. load). This is the temperature dierence between the air and condensing
temperature.
r35 Dim tm K
Dimensioning temperature Min tm
The mean temperature dierence across the condenser at the lowest relevant
compressor capacity (tm dierence at min. load). This is the temperature dierence
between the air and condensing temperature.
r56 Min tm K
Reading your P0
This is where you can see the actual pressure that is being measured by the pressure
transmitter.
The value is part of the regulation, since the regulation signal for capacity regulation
originates from the pressure transmitter.
The value is part of the frost protection regulation, since the regulation signal for
capacity regulation originates from the temperature sensor.
r57 P0°C / P0 b
Reading your T0
This is where you can see the actual pressure being measured by the sensor chosen
for capacity regulation (the sensor is dened in o81). The value is displayed in °C.
r58 Cmp.CtrlSens
Compressor capacity Compressor pack cong.
Running time
To prevent frequent start/stop, values have to be set for how the relays are to cut in
and out.
Min. ON time for relays.
(The time is not used if the relay cuts an unloader in or out).
c01 Min.ON time
Min. time period between cutin of same relay.
(The time is not used if the relay cuts an unloader in or out).
c07 MinRecyTime
Setting for neutral zone regulation
Regulation band over the neutral zonen c10 + Zone k / + Zone b
Time delay between step cut-ins in the regulation band over the neutral zone c11 + Zone m
Time delay between step cut-ins in the regulation band over the "+Zone band". c12 + + Zone m
Regulation band under the neutral zone c13 - Zone k / - Zone b
Time delay between step cut-outs in the regulation band under the neutral zone c14 - Zone m
Time delay between step cut-outs in the regulation band under the "-Zone band" c15 - - Zone m
Pump down limit
The factory setting for this function is OFF.
Activate by setting a value corresponding to pressure under the zone and over the P0
min. limit.
The function keeps the last capacity step going until the pressure comes down to the
pump down limit. When this value is reached the last compressor will cut out.
Do not reconnect capacity until the pressure is once more above the neutral zone.
c33 PumpDownLim.
Compressor conguration
This setting only applies if “061” is set to “1” or “2”.
Here you set the predened combination of number of compressors and any unload-
ers.
1= One compressor, 2= two compressors, 3= three, 4= four.
5= One compressor + one unloader. 6= One compressor + two unloaders.
For 7to 26: See survey on page 11
If the compressors are of dierent sizes the setting must be selected to either 4 or 0.
At pos. 0 it is up to you to determine which relays have to be drawn on at each of the
required capacity steps.
c16 Compr mode
Selection of coupling mode (See also the overview page 11)
1. Sequential: First relay 1 cuts in, then relay 2, etc. Cutout takes place in the opposite
sequence. (”First in, last out”).
2. Cyclic: An automatic operating time equalisation is arranged here, so that all steps
with motor connection will have the same operating time
3. Binary and cyclic (only for four compressors with "c16" set to 4.
c08 Step mode
Unloaders’ cutin and cutout mode
The relays for unloaders can be set to switch on when more capacity is required (set-
ting = 0), or they can switch o when more capacity is called for (setting = 1).
c09 Unloader
(switch on = 0)
(switch o = 1)

6 Manual RS8EJ302 © Danfoss 05-2010 AK-PC 530
Mix and Match step 1.
This function cuts the relay in and out depending on the denitions in "c17" to"c28".
(“c17” to “c28” only used, if “o61” selected to “3” or "4"). (In Mix and Match couplings the
settings “c08” and c09" are not used).
Step 1
Here in c17 set the relays to be ON at step 1.
Setting takes place with a numerical value representing the combination of relays. See
the survey page 11. Proceed by dening steps two, three, etc.
The denition ends at the rst c18 - c28 which is set to“0”.
The time delays“c01” and “c07” belong to the individual relay outputs. If a relay output
is captured by the time delay, a changeover from one step to another will only take
place when all the relay outputs concerned have been released. The time delay will
not interfere with a relay which is ON in two successive couplings. If a compressor
drops out there will be an alarm. The regulation will continue as emergency operation,
as if the compressor were present.
c17 M&M Step 1
Step 2. Here you also set a value between 1 and 15. Here in c18 the value will indicate
which relays have to be ON at step 2.
c18 M&M Step 2
Step 3. etc. c19 M&M Step 3
4. Etc. c20 M&M Step 4
5. c21 M&M Step 5
6. c22 M&M Step 6
7. c23 M&M Step 7
8. c24 M&M Step 8
9. c25 M&M Step 9
10. c26 M&M Step 10
11. c27 M&M Step 11
12. c28 M&M Step 12
Manual control of compressor capacity
This sets the capacity that is to be cut in when switching to manual control.
(c01 and c07 will still apply)
c31 CmpManCap%
Manual control
Manual control of the compressor capacity is enabled here.
When set to ON, the capacity that is set in “c31” is cut in.
c32 CmpManCap
- - - - Comp. Cap %
Read cut-in compressor capacity
Actuel zone state:
0=o. 1= --zone. 2=-zone. 3=Neutral-
zone. 4=+zone. 5=++zone
Condenser capacity
Denition of condenser and number of fans
Here you set the number of fan steps with which regulation has to be carried out (but
max. eight).
1-8: All fans are cut in and out with relays. The rst vacant relay number is assigned to
fan 1, the next to number 2, etc. Steps after DO8 must be executed through connec-
tion of a relay module type EKC 331 to the analog output. Cf. drawing on page 12.
9: All fans controlled via the analog output and a frequency converter.
10: Not used
11-18: Total number of fan relays (as 1-8), but here the starting sequence is altered
after each time all fans are stopped.
c29 Fan mode
Read temperature at sensor Sc3 u44 Sc3 temp
Read temperature at sensor Sc4 (sensor is only used for monitoring) u45 Sc4 temp
- - - - Fan Cap %
Read cut-in condenser capacity
Regulation parameters for the condenser regulation
Proportional band xp (P = 100/Xp)
If the Xp value is increased, the regulation becomes steadier
n04 Xp K
I: Integration time Tn
If the Tn value is increased, the regulation becomes steadier
n05 Tn s
Manual control of condenser capacity
This sets the capacity that is to be cut in when switching to manual control.
n52 FanManCap%
Manual control
Manual control of the condenser capacity is enabled here.
When set to ON, the capacity that is specied in “n52”is cut in.
n53 FanManCap
Speed control start value
Speed control will only be activated when the capacity requirement reaches this
value.
n54 StartSpeed
Speed control stop value
Speed control will be stopped when the capacity requirement falls below this value.
n55 MinSpeed

AK-PC 530 Manual RS8EJ302 © Danfoss 05-2010 7
Miscellaneous Miscellaneous
Choice of application
The regulator can be congured in various ways. The use that is required out of the
four uses available is set here. The functions for the four uses can be viewed on page
14. This menu must be set as the rst of all menus, as it enables the associated settings to
be set.
1. Show temperature and "c16" mode
2: Show pressure and "c16" mode
3. Show temperature and M&M mode
4. Show pressure and M&M mode
o61 This setting cannot be made via data
communication. It must be set directly
on the controller.
Sensor type (Sc3, Sc4 and "Saux1") (see also overview page 21)
Normally a Pt1000 sensor with great signal accuracy is used for temperature measure-
ment and AKS 32R for pressure measurement. But a PTC sensor may also be used (r25
= 1000) in special situations.
All temperature sensors must be of the same kind.
In brine cooling the pressure measurements are replaced by temperature measure-
ments.
The following settings are possible:
0=PT1000. 1=PTC1000. 2=PT1000 on sensors and on Po. 3=PTC1000 on sensors and
on Po. 4=PT1000 on sensors and on Pc. 5=PTC1000 on sensors and on Pc. 6=PT1000
on sensors, on Po and on Pc. 7=PTC1000 on sensors, on Po and on Pc.
(If a temperature sensor is mounted on P0 or Pc, the respective settings in o20, 21, 47
and 48 will not be required).
o06 Sensor type
Settings at water cooler application
Denition of the signal inlet when compressor regulation is controlled with signal
from a temperature sensor:
0. Temperature signal on terminal 57-58 (P0 inlet)
1. Temperature signal on Saux inlet
2. Temperature signal on Sc4 inlet
(P0 min. function (A11) will not be aected by the denition)
If frost protection is required, you must connect a pressure transmitter on P0 and the
temperature sensor must be connected to the Saux or Sc4 input.
Select 1 or 2 at plants where there is no need for frost protection, the alarm "E2" can
be suppressed by connecting the signal from the PC (terminal 61) to P0 (terminal 58).
o81 Ctrl.Sensor
Alarm Alarm settings
The controller can give alarm in dierent situations. When there is an alarm the light-
emitting diodes (LED) will ash on the display and the alarm relay will cut in.
(In AK-PC 530 the alarm relay may be used for a fan, if required).
P0 min. (Alarm and safety function, see also page 20.)
Here you set when the alarm at too low suction pressure is to enter into eect. The
value is set as an absolute value.
A11 Min. P0. b
Alarm delay P0 alarm
The time delay is set in minutes. At min. setting the alarm is cancelled.
A44 P0AlrmDelay
Pc max. (Alarm and safety function, see also page 20.)
Here you set when the alarm at too high condensing pressure is to enter into eect.
The value is set as an absolute value.
A30 Max. Pc. b
Alarm delay Pc alarm
The time delay is set in minutes. At min. setting the alarm is cancelled.
A45 PcAlrmDelay
Alarm delay DI1 (an interrupted input will give alarm).
The time delay is set in minutes. At max. setting the alarm is cancelled.
A27 DI1AlrmDelay
Alarm delay DI2 (an interrupted input will give alarm).
The time delay is set in minutes. At max. setting the alarm is cancelled.
A28 DI2AlrmDelay
Alarm delay DI3 (an interrupted input will give alarm).
The time delay is set in minutes. At max. setting the alarm is cancelled.
A29 DI3AlrmDelay
Alarm limit for high temperature of the“Saux1” sensor
With setting = O the alarm has been opted out.
A32 Saux1 high
Alarm delay from "Saux1" (A32)
If the limit value is exceeded, a timer function will commence. The alarm will not be-
come active until the set time delay has been passed. The time delay is set in minutes.
A03 Alarm delay
Give the top button a brief push to zeroset the alarm and to have the message shown
on the display.
Reset alarm
The function zerosets all alarms when
set in pos. ON.
With data communication the impor-
tance of the individual alarms can be
dened. Setting is carried out in the
“Alarm destinations” menu.

8 Manual RS8EJ302 © Danfoss 05-2010 AK-PC 530
Display connection
This is where you dene the type of display that is connected to the controller
O: EKA 164
On: EKA 165. The extended display with LEDs.
o82
Read temperature at sensor "Saux1" o49 Saux1 temp
Pressure transmitter’s working range
Depending on the pressure, a pressure transmitter with a given working range is
used. This working range must be set in the controller (e.g.: -1 to 12 bar
The values 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.
P0-Min. value o20 P0MinTrsPres
P0-Max. value o21 P0MaxTrsPres
Pc-Min. value o47 PcMinTrsPres
Pc-Max. value o48 PcMaxTrsPres
Use of DI1 input
The digital input can be connected to a contact function, and the contact can now be
used for one of the following functions:
Setting / function:
0: DI input not used
1: Fan alarm when contact cuts out. Alarm "A34" is given.
2: Alarm function when the contact cuts out. Alarm “A28” is given.
There is time delay for the alarm. Setting in "A27".
o78 Di1 control
Use of DI4 input
The digital input can be connected to a contact function, and the contact can now be
used for one of the following functions:
Setting / function:
0: DI input not used
1: Regulation reference P0 displaced when contact is cut in
2: Alarm function when the contact cuts out. Alarm “A31” is given. There is no time
delay.
o22 Di4 control
Use of DI5 input
The digital input can be connected to a contact function, and the contact can now be
used for one of the following functions:
Setting / function:
0: DI input not used
1: Regulation reference Pc displaced when contact is cut in
2: Alarm function when the contact cuts out. Alarm “A32” is given. There is no time
delay
o37 Di5 control
Operating hours
The operating hours for the compressor relays can be read and set in the follow-
ing menus. The read value is multiplied by 1000 to obtain the number of hours (f.ex.
shows 2.1 for 2100 hours). On reaching 99.9 hours the counter stops and must now be
reset to, say, 0. There will be no alarm or error message for counter overow.
(In the AKM display the hour number
has not been multiplied)
Value for relay number 1 to 4 o23-
o26
DO1 run hour.....
DO4 run hour
Value for relay number 5 to 8 o50-
o53
DO5 run hour ......
DO8 run hour
Refrigerant setting
Before refrigeration is started, the refrigeration must be dened. You may choose
between the following refrigerants:
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, 32=R413A. 33=R422D. 34=R427A. 35=R438A.
Warning: Wrong selection of refrigerant may cause damage to the compressor.
Other refrigerants: Select setting 13 here, and subsequently three factors have to be
set – fac1, fac2 and fac3 – via AKM.
o30 Refrigerant
Manual control (stopped regulation only)
From this menu the relays can be cut in and out manually. 0gives no override, but a
number between 1 and 10 will cut in a belonging relay. 1will cut in relay number 1, 2
relay 2, etc.
11-18 will produce voltage on the analog output. In this way the relays on the exter-
nal relay module can be activated. Setting 11 will give a voltage of 1.25 V, setting 12
will give 2.5 V, etc.
o18 - - -
Frequency
Set the net frequency.
o12 50 / 60 Hz
(50=0, 60=1)

AK-PC 530 Manual RS8EJ302 © Danfoss 05-2010 9
Address
If the controller is built into a network with data communication, it must have an
address, and the master gateway of the data communication must then know this
address.
These settings can only be made when a data communication module has been
mounted in the controller and the installation of the data communication cable has
been completed.
This installation is mentioned in a separate document “RC8AC”.
Following installation of a data com-
munication module, the controller can
be operated on a par with the other
controllers in ADAP-KOOL® refrigera-
tion controls.
The address is set between 1 and 240 (gateway determined) o03
The address 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 not, you can cancel the function with setting
OFF.
o05
Special settings
Outputs DO9 and DO10 are normally used for the ”AKD start/stop”function and for the alarm
function, but they may be redened in special cases.
DO9 function:
0: AKD Start/stop
1: Inject-on function (see drawing below)
2: Boost ready function (see drawing below)
3: Fan relay
(If "c16" is set to 18, "o75" will automatically be set to unloader relay for compressor 3)
o75 DO9 function
DO10 function:
0: Alarm relay
1: Fan relay
o76 DO10 function
Status on the digital inputs
The signal on the DI inputs can be read in the following menus:
Status on DI 1 u10 DI 1 Status
Status on DI 2 u37 DI 2 Status
Status on DI 3 u87 DI 3 Status
Status on DI 4 u88 DI 4 Status
Status on DI 5 u89 DI 5 Status
Conguration settings (compressor and fan denitions, coupling mode and refrigerant) can only take place when regulation is stopped.
Warning ! Direct start of compressors *
To prevent compressor breakdown parameter c01 and c07 should be set according to suppliers requirements or in general :
Hermetic Compressors c07 min. 5 minutes
Semihermetic Compressors c07 min. 8 minutes and c01 min. 2 to 5 minutes ( Motor from 5 to 15 KW )
* ) Direct activating of solenoid valves does not require settings dierent from factory (0)
Inject-on function
DO9 is here used for the Inject ON function. Here all the electronic expansion valves are closed when all the compressors are stopped
and P0 > +Zone.
Wiring is carried out as shown below.
The function may however also be generated via data communication. In this way the relay output is made available for other
applications.
Boost ready function
If two controllers are to capacity regulate the high-temperature part and the low-temperature part, respectively, they must be
connected in such a way that low-temperature regulation cannot be started until the high-temperature part is operating. The signal
can be taken from DO9 of one controller and received on the ON input of the other controller.
Example:
DO9 function:

10 Manual RS8EJ302 © Danfoss 05-2010 AK-PC 530
Operating status
The controller goes through some regulating situations where it is just waiting for the next
point of the regulation. To make these “why is nothing happening” situations visible, you can
see an operating status on the display. Push briey (1s) the upper button. If there is a status
code, it will be shown on the display. The individual status codes have the following meanings
EKC state
S0: Regulation 0
S2: When the relay is operated, it must be activated for min. x minutes (cf. c01) 2
S5: Renewed cutin of the same relay must not take place more often than every x minutes (cf.
c07)
5
S8: The next relay must not cut in until x minutes have elapsed (cf.c11-c12) 8
S9: The next relay must not cut out until x minutes have elapsed (cf. c14-c15) 9
S10: Regulation stopped with the internal og external start/stop 10
S25: Manual regulation of outputs 25
S34: Safety cutout. Setting A30 is exceeded 34
Alarm messages Alarms "Destinations"
A2: Low P0 A02 Low P0 alarm
A11: No refrigerant has been selected (cf. o30) A11 No RFG Sel
A17: High Pc A17 Hi Pc alarm
A19 ....A26: Compr. fault. Interupted signal on actual input (terminal 29-36) A19..... A26 Comp._fault
A27: High temperature alarm for sensor "Saux1" A27 Saux1 high
A28 .... A32: External alarm. Interrupted signal on input "DI1" /2/3/4/5 A28..... A32 DI_ Alarm
A34: Fan alarm. There is signal on DI1 input A34 Fan fault
A45: Regulation stopped with setting or with external switch A45 Stand by
E1: Error in the controller E1 Ctrl. fault
E2: Control signal outside the range (short-circuited/interrupted)
At water cooler management without frost protection may alarm from a not mounted P0
input suppressed by connecting the signal from the PC (terminal 61) to P0 (terminal 58).
E2 Out of range

AK-PC 530 Manual RS8EJ302 © Danfoss 05-2010 11
Compressor connections Coupling
mode
Relay no. Set
"C08"
to
Set
"C16"
to
Capacity step
All capacity steps are presumed to be identi-
cal. The only exception is the settings c16 = 4
and 21 to 26.
Coupling mode
Coupling mode 1 = sequential operation.
Coupling mode 2 = cyclic operation.
Coupling mode 3 = cyclic and binary
operation where the compressor capacities
are, as follows:
1: 9%
2: 18%
3: 36%
4: 36%
There is cyclic coupling at 3 and 4, and binary
on 1, 2 and 3/4.
(for c16=4 only)
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.
Equalised operation
When c16 = 21 to 26, compressor 1 +
belonging unloader must have the same
capacity as each of the subsequent
compressors. The unloading function will
equalise the cut-in capacity when the
subsequent compressors are cut in and out.
Compressor 1 will always be operating.
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 conguration when o61 = 3 or 4 (This is where you must dene yourself how the relays are to be activated.)
Survey of relays in Mix and Match operation
Relay no. Calculation
value Combination of relays that must be cut in
1 1 1 1 1 1 1 1 1 1
2 2 2 2 2 2 2 2 2 2
3 4 4 4 4 4 4 4 4 4
4 8 8 8 8 8 8 8 8 8
The sum of 1-8 is the
setting value for each step 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Example 2
If capacity step 1 has to cut in relay number 3 only, you must set c17 to 4.
If capacity step 2 has to cut in relay number 4 only, you must set c18 to 8.
If capacity step 3 has to cut in relay numbers 3 and 4, you must set c19 to 12.
Continue with a setting for c20 etc. until all capacity steps have been dened.
Capacity steps
Example 1
Settings:
c17 to 1
c18 to 2
c19 to 3
c20 to 4
c21 to 5
c22 to 6
c23 to 7
(Mix and Match used only on plants with up to 4 compressors.)

12 Manual RS8EJ302 © Danfoss 05-2010 AK-PC 530
Output signal from AK-PC 530
In EKC 331 the voltage range must be set to 0-5 V (“o10” = 6).
In EKC 331 the number of steps must be set to 4 (“o19” = 4) (also when
fewer fans are connected).
Output signal from AK-PC 530
In the rst EKC 331, set 0-5 V (“o10” = 6).
In the second EKC 331, set 5-10 V (“o10” = 7).
In both EKC’s the number of steps must be set to 4 (“o19” = 4) (also when
fewer fans are connected to the second EKC).
If the entire condenser capacity is to be controlled by
a frequency converter, AK-PC 530 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-DO8) will become the rst fan relay.
It will be followed by the subsequent relays. If more relays are
required than the vacant DO relays, a relay module can be
connected to the analog output. The function is, as follows:
If there are up to four external fans on an EKC 331:
1. 2.
If there are more than four external fans on two EKC 331 units:
Connection Connection
Alternating start-up of fans (only if c29 is 11 to 18)
The fans can be dened to start alternately when they have all
been stopped.
The rst time regulation is started, fan 1 will be started rst – the
regulation determines whether additional fans will be started.
After the next time all fans are stopped, fan 2 will be the rst to be
started, and so on.
Fan 1 will again be the rst fan to be started when the rotation has
been through the total number of fans.
If there is more than one fan on an EKC 331, it will not be possible
to start the other fans rst. Here, the fan with the lowest voltage
step will always be the one which is started rst.

AK-PC 530 Manual RS8EJ302 © Danfoss 05-2010 13
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 mittle button. When you have changed
the value, save the new value by once more pushing the mittle
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 optimization 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 parameter names
for the functions can be viewed in the right-hand column on
pages 4–10.
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 will show the active alarm codes. See page 17.)
EKA 163
EKA 164

14 Manual RS8EJ302 © Danfoss 05-2010 AK-PC 530
Menu survey
To be continued
SW: 1.3x
Sequence
1. o61 must be set as the rst parameter. This parameter determines which of the four 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 and then either (c08, c09 and c16) or (c17 to 28) – continue with 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
1234
Normal display
Shows P0 in EKA 165 (display with buttons) - °C P °C P °C / bar
Shows Pc in EKA 163 - °C P °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/ 60.0bar -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 reference
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 regulation. 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)
3: Binary and cyclic
c08 1 3 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

AK-PC 530 Manual RS8EJ302 © Danfoss 05-2010 15
Regulation parameter for + Zone c11 0.1 min 60 min 4.0
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 11. c16 1 26 0
Following "c17" to "c28" is another way to dene compres-
sorw than with "c16".. A code will then have to be set for
the relays that are to be ON at the dierent steps:
Step 1 (M&M operation)
c17 0 15 0
Step 2 (M&M operation) c18 0 15 0
Step 3 (M&M operation) c19 0 15 0
Step 4 (M&M operation) c20 0 15 0
Step 5 (M&M operation) c21 0 15 0
Step 6 (M&M operation) c22 0 15 0
Step 7 (M&M operation) c23 0 15 0
Step 8 (M&M operation) c24 0 15 0
Step 9 (M&M operation) c25 0 15 0
Step 10 (M&M operation) c26 0 15 0
Step 11 (M&M operation) c27 0 15 0
Step 12 (M&M operation) c28 0 15 0
Denition of condenser:
1-8: Total number of fan relays or voltage step on the
voltage output
9: Only via analog output and start of frequency con-
verter
10: Not used
11- 18: Total number of fan relays which are to be con-
nected with alternating start-up.
c29 0/OFF 18 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 /200.0bar 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
* this setting is only possible if data communication module is mounted in the controller

16 Manual RS8EJ302 © Danfoss 05-2010 AK-PC 530
Used sensor type for Sc3, Sc4 and "Saux1"
0=PT1000, 1=PTC1000
2-7=variations with temperature sensor on P0 and Pc. See
earlier in the manual and page 21.
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, 32=R413A. 33=R422D. 34=R427A. 35=R438A.
o30 0 35 0
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 and "c16" mode
2: Show pressure and "c16" mode
3. Show temperature and M&M mode
4. Show pressure and M&M mode
o61 1 2 3 4 1 4 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
and a pressure transmitter has to be mounted on P0
o81 0 2 0
Display connection
O: EKA 164
On: EKA 165 (extended display with light-emitting diodes)
o82 O On O

AK-PC 530 Manual RS8EJ302 © Danfoss 05-2010 17
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 29-36
A20 Compressor 2 error
A21 Compressor 3 error
A22 Compressor 4 error
A23 Compressor 5 error
A24 Compressor 6 error
A25 Compressor 7 error
A26 Compressor 8 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 (29-36) are open
PS Info Access code is required before you have access to
the settings
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 middle button pressed at the same time as you recon-
nect the supply voltage
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
* At water cooler management without frost protection may alarm from a not
mounted P0 input suppressed by connecting the signal from the PC (terminal 61) to
P0 (terminal 58).

18 Manual RS8EJ302 © Danfoss 05-2010 AK-PC 530
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
27-33 24 V signal from the safety circuit DO 5
27-34 24 V signal from the safety circuit DO 6
27-35 24 V signal from the safety circuit DO 7
27-36 24 V signal from the safety circuit DO 8
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
(see settings page 12)
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 from 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 necessary to wire the belonging
safety circuit.
Ex. with an unloader on DO2 a connec-
tion on terminal 30 can be left out
*)
Relays DO9 and DO10 may in special cases be recongurated so that they can be
used as fan relays. See also page 9.
Unloader
**)
• If the controller has to control only the compressor 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
Compressor control
with temperature
o06 = 0
o81 = 1
Other combinations: see page 21

AK-PC 530 Manual RS8EJ302 © Danfoss 05-2010 19
Data Ordering
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 for normal,
good engineering practice.
Danfoss wil not be responsible for any goods, or plant compo-
nents, damaged as a result of the above defects. It is the installer's
responsibility to check the installation thoroughly, and to t the
necessary safety devices.
Special reference is made to the necessity of signals to the
controller when the compressor is stopped and to the need of
liquid receivers before the compressors.
Your local Danfoss agent will be pleased to assist with further
advice, etc.
Montage
Supply voltage 24 V a.c. +/-15% 50/60 Hz, 5 VA
Input signal
2 pcs. Pressure transmitters type AKS 32R
(temperature sensor in brine systems)
3 pcs. temperature sensor input for PT 1000
ohm/0°C or PTC 1000 ohm/25°C
Digitale input from
contact function.
1 pcs. for Start/stop of regulation
8 pcs. for monitoring of safety circuits
3 pcs. for alarm function
2 pcs. for alarm function or for displacement of
references
Relay output for
capacity regulation 8 pcs. SPST AC-1: 3 A (ohmic)
AC-15: 2 A (inductive)
"AKD start/stop" relay 1 pcs. SPST
Alarm relay 1 pcs. SPDT AC-1: 6 A (ohmic)
AC-15: 3 (inductive)
Voltage output 0-10 V d.c. Max. 5 mA, Ri min. 2.2 kohm
Display outputs
EKA 163 Pc display
EKA 165(164) Operation, P0 display and
LED
Data communication 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 inuence / vibrations
Enclosure IP 20
Weight 0.4 kg
Mounting DIN rail or on wall
Terminals max. 2.5 mm2multicore
Approvals
EU Low voltage Directive and EMC demands re
CE-marking complied with.
LVD-tested acc. to EN 60730-1 and EN 60730-2-9
EMC-tested acc. to EN61000-6-2 and 3
Pressure transmitter / temperature sensor
Please refer to catalogue RK0YG...
Type Function Code no.
AK-PC 530 Capacity controller 084B8007
EKA 163B Display unit 084B8574
EKA 164B Display unit with operation buttons 084B8575
EKA 165
Display unit with operation buttons
and light-emitting diodes for input and
output
084B8573
Cable for display unit 2 m, 1 pcs. 084B7298
Cable for display unit 6 m, 1 pcs. 084B7299
EKA 175 Data communication module, RS 485 084B8579
EKA 178B Data communication module, MOD-bus 084B8571
EKA 174
Data communication module, LON RS
485, with galvanic separation (recom-
mended when output 0-10 V is used)
084B7124
Danfoss 84B2330.11
Display type EKA 163 / EKA 164
AK-PC 530
Display type EKA 165
Only for front mounting (IP 40)
Only connection via plugs

20 Manual RS8EJ302 © Danfoss 05-2010 AK-PC 530
Safety function
Criterion Compressor control Condenser control
P0 < P0 min (A11) 0% capacity. (Min ON time (c01) overrid-
den)
No change
P0 signal failure (P0 reading < 5%) Calculated average capacity No change.
Pc > Pc max. minus 3 K
(The "HP" LED on EKA 165 lights up)
The capacity changes to 2/3 of the actual
capacity. After 30 seconds it changes to
half capacity.
After a further 30 seconds there is a full
cut-out.
100% capacity
Pc > Pc max. (A30) 0% capacity 100% capacity
Pc signal failure (Pc reading < 5%) No change 100% capacity
Sc3 signal failure (Variable reference (r33) is
set to 2 or 4)
No change The variable part is omitted.
Reference (r29) = Setting (r28)
Signal failure on the regulation sensor
(Saux or S4. (o81))
The P0 reference lowers by 5 K. At the same
time, the P0 signal becomes the regulation
sensor
No change
Exercising fans
On the setting c29 = 1-8 the last fans will hardly be activated during the winter.
To ensure that the fans are‘exercised’ a test will be carried out every 24 hours to check whether all relays have been in operation.
The relays that have not been used will now be activated for 30 seconds, but with a pause of one hour between individual relays.