Set Control Of Compressors - Danfoss ADAP-KOOL AK-HP 780 Design Manual

Configuration - continued

Set control of compressors

1. Go to Configuration menu
2. Select Suction group
3. Set values for the reference
Press the +-button to go on to the
next page
4. Set values for capacity control
Press the +-button to go on to the
next page
50
The configuration menu in the Service Tool
has changed now. It shows the possible set-
tings for the selected plant type.
In our example we select the settings:
- Set point = 60°C
- Night setback value = 5 K.
The settings are shown here in the display.
There are several pages, one after the other.
The black bar in this field tells you which of
the pages is currently displayed.
Move between the pages using the + and -
buttons.
In our example we select:
- 4 compressors
- Refrigerant = R744
- Best fit
Heat pump controller RS8GF202 © Danfoss 2015-08
f you want to know more about the different configu-
ration options, they are listed below.
The number refers to the number and picture in the
column on the left.
The screen only shows the settings and readings that
are required for a given set-up.
3 - Reference
Reference = set reference + night offset + offset
from external 0-10 V signal
Setting ( -80 to +120°C)
Setting of required Sctrl temperature in °C.
Offset via Ext. Ref
Select whether a 0-10V external reference override
signal is required
Offset at max input (-100 to +100 °C)
Displacement value at max. signal (10)
Offset at min input (-100 to +100 °C)
Displacement value at min. signal (0 V)
Offset filter (10 - 1800 Sec)
Here you can set how quickly the reference must
become effective.
Night Offset via DI
Select whether a digital input is required for activa-
tion of night operation. Night operation can alterna-
tively be controlled via internal weekly schedule or
via a network signal
Night Offset (-25 to +25 K)
Displacement value for suction pressure in con-
nection with an active night setback signal (set in
Kelvin)
Max reference (-50 to +80 °C)
Max. permissible suction pressure reference
Min reference (-80 to +25 °C)
Min. permissible suction pressure reference
4 - Compressor application
Select the compressor application required
No. of compressors
Set number of compressors
No. of unloaders
Set number of unloader valves
Control sensor
= Sctrl
P0 refrigerant type
Select refrigerant type
P0 refrigerant factors K1, K2, K3
Only used if "Po refrigerant type" is set to custom
(contact Danfoss for information)
Step control mode
Select coupling pattern for compressors
Sequential: Compressors are cut in/out in strict ac-
cordance with compressor number (FILO)
Cyclic: Runtime equalisation between compressors
(FIFO)
Best fit: Compressors are cut in/out in order to
make the best possible fit to actual load
Injection heat exchanger
Selects whether an output signal is to be sent for
start/stop of liquid injection in a cascade heat
exchanger
VSD min speed (0.5 – 60.0 Hz)
Min. speed where the compressor must cutout
VSD start speed (20.0 – 60.0 Hz)
Minimum speed for start of Variable speed drive
(Must be set higher than "VSD Min. Speed Hz")
VSD max speed (40.0 – 120.0 Hz)
Highest permissible speed for the compressor
motor
VSD safety monitoring
Select this if input for monitoring of the frequency
converter is required
Load shed limits
Select how many load shedding inputs are required
Load shed limit 1
Set max capacity limit for load shed input 1
Load shed limit 2
Set max capacity limit for load shed input 2
AK-HP 780