Set Point Limitation; Compressor Configuration; Manual Control - Danfoss AK-PC 560 User Manual

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.
Min. permissible set point value.
Correction of pressure measurement
An offset adjustment of the registered pressure can be made.
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.
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.
Compressor capacity
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.
Min. time period between cutin of same relay.
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.

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
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.
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)

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.
Time delay for incorrect cut-out
Applies to compressor 1
Time delay for incorrect cut-out
Applies to the other compressors
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
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.
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.
Kp factor
For PI regulation of the digital scroll
Tn factor
For PI regulation of the digital scroll
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%.
AK-PC 560 Manual RS8GE202 © Danfoss 01-2016
r30 PcRefMax °C / PcRefMax b
r31 PcRefMin °C / PcRefMin b
r32 AdjustPcSens
r35 Dim tm K
r56 Min tm K
Compressor pack config.
c01 Min.ON time
c07 Recycle time
c33 PumpDownLim.
c16 Compr mode
c08 Step mode
c31 CmpManCap%
c32 CmpManCap
c77 C1 fault del
c78 Cx fault del
c79 DS PWM per
c80 PWM Max cap
c81 PWM Min cap
c82 DS Kp
c83 DS Tn
c84 DS Size
- - - Comp. Cap %
Read cut-in compressor capacity
5