Danfoss AK-PC 560 User Manual page 4

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
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.
Compressor regulation reference
P0 setpoint
Regulation is based on the set value plus an offset, if applicable. An offset can be cre-
ated from night setback r13 and/or from a system units override function.
Offset
The set reference may be displaced with a fixed value when a signal is received at the
DI4 input or from the function "Night setback" (r27).
(Cf. also Definition of DI4 input).
Night setback
OFF: No change of the reference
ON: Offset value forms part of the reference
Reference
The regulation reference is shown here
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 set point value.
Min. permissible set point value.
Neutral zone
There is a neutral zone around the reference. See also page 3.
Correction of pressure measurement
An offset adjustment of the registered pressure can be made.
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)
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).
Condenser regulation reference
Pc set point
Regulation is based on the set value plus an offset, if applicable. An offset can be cre-
ated via the "r34" function and/or from a system units override function.
Offset
The set reference may be displaced with a fixed value when a signal is received at the
DI5 input. (Cf. also Definition of DI5 input).
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-offset at max. compres-
sor capacity can be accepted).
1: No change of the reference. Regulation based on set set point. And offset 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 offset with the DI5 function not allowed. At DI5 signal the reference will
change to the set set point.
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)
Condenser reference
The regulation reference is shown here.
4 Manual RS8GE202 © Danfoss 01-2016
Para- Parameter by operation via
meter data communication
P0 °C or P0 b
Pc °C or Pc b
Compressor control
r23 P0Set Point °C / P0Set Point b
r13 Night offset
r27 NightSetBack
r24 P0 ref. °C / P0 ref. b
r25 P0RefMax °C / P0RefMax b
r26 P0RefMin °C / P0RefMin b
r01 Neutral zone
r04 AdjustP0Sens
r05 Unit
(In AKM only SI (bar and °C) is used,
whatever the setting)
r12 Main Switch
Condenser control
r28 PcSet Point °C / PcSet Point b
r34 PcRefOffset
r33 Pc mode
r29 Pc ref. °C / Pc ref. b
AK-PC 560