Danfoss AK-PC 560, User Manual, Page: 5 / 24

AK-PC 560 Manual RS8GE202 © Danfoss 01-2016 5
Set point limitation
With these settings the set point can only be set between the two values.
(This also applies to regulations where the Xp band lies above the reference).
Max. permissible set point value.
r30 PcRefMax °C / PcRefMax b
Min. permissible set point value. r31 PcRefMin °C / PcRefMin b
Correction of pressure measurement
An offset adjustment of the registered pressure can be made.
r32 AdjustPcSens
Dimensioning temperature Dim tm
The mean temperature difference across the condenser at maximum load (tm differ-
ence at max. load). This is the temperature difference between the air and condensing
temperature.
r35 Dim tm K
Dimensioning temperature Min tm
The mean temperature difference across the condenser at the lowest relevant
compressor capacity (tm difference at min. load). This is the temperature difference
between the air and condensing temperature.
r56 Min tm K
Compressor capacity Compressor pack config.
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. c01 Min.ON time
Min. time period between cutin of same relay. c07 Recycle time
Pump down limit
The factory setting for this function is OFF.
Activate by setting a value corresponding to pressure under the regulation area 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 configuration
Here you set the of number of compressors
1=
One compressor,
2
= two compressors
3=
3,
4=
4,
5=
5,
6=
6,
7
=7.
See survey on page 11
c16 Compr mode
Selection of coupling mode
(See also the overview page 11)
1. S. Sequential: First relay 1 cuts in, then relay 3, etc. Cutout takes place in the oppo-
site sequence. (”First in, last out”).
2. Cyclic: An automatic operating time equalisation is arranged between the remain-
ing compressors.
c08 Step mode
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
Time delay for incorrect cut-out
Applies to compressor 1
c77 C1 fault del
Time delay for incorrect cut-out
Applies to the other compressors
c78 Cx fault del
Pulse width period for the capacity modulation
The digital scroll compressor's by-pass valve can be turned on and off during this
period, but only one sequence.
This is where you set how often the by-pass valve is to be activated
c79 DS PWM per
Max. capacity in the pulse width period
It is possible to limit the capacity for the period here. If the setting is 100%, then there
is no limit.
c80 PWM Max cap
Min. capacity in the pulse width period
A minimum capacity for the period must be set here. Without this minimum capacity
the compressor will not be cooled.
c81 PWM Min cap
Kp factor
For PI regulation of the digital scroll
c82 DS Kp
Tn factor
For PI regulation of the digital scroll
c83 DS Tn
Compressor conditions
This is where the size of the digital compressor's capacity is set in relation to the
capacity of one of the other compressors. Setting range = 100 to 200%.
c84 DS Size
- - - Comp. Cap %
Read cut-in compressor capacity