8510223 P01-A © Danfoss Commercial Compressors March 2006
Instructions
Example of control cables connection
Modifications to move from open loop control to process loop:
Bus
Start
Process Control via an AKS32
Inc
orp
ora
te
se
cu
rity
de
vic
es
on
27
in
pu
t
12 13 16 17 18 19 20 27 29 32 33
39
37
42 45 50 53
4
5
54 55 60 61
1
2
3
CO
M
+1
0 V
0/4
-20
m
A
0/4
-20
m
A
CO
M
68 69
RS
48
5
Frequency converter CD302 Compressor Drive
TM
Analogue
output
Analogue
input
Digital
output
to external
fault relay
0 ±
10
V
0 ±
10
V
0/4
-20
m
A
Bus
Start
Process Control via an AKS33
to external
fault relay
0/4
-20
m
A
0 ± 10 V or
4-
20
mA
1
2
3
CO
M
+1
0 V
0/4
-20
m
A
0/4
-20
m
A
CO
M
68 69
RS
48
5
Frequency converter CD302 Compressor Drive
TM
Analog
output
Analog
input
Digital
output
4
5
54 55 60 61
42 45 50 53
29 32 33
39
37
18 19 20 27
12 13 16 17
Inc
orp
ora
te
se
cu
rity
de
vic
es
on
27
in
pu
t
Note: CD compressor Drive frequency converters are delivered with a factory preset “open loop control” for compressor speed magement.
To switch from open loop to process loop cable
signal connections have to be done has shown
below.
The only parameters modifications are:
Load / motor
Parameter 1.00
Configuration mode: Process
Reference / Ramps
Parameter 3.01
bar
Parameter 3.02
-1 bar
Parameter 3.03
+12 bar
Parameter 3.10
suction pressure adjus-
tement required as a percentage of the sensor
pressure range (28% for 3.4 bar
-10°C R404A)
Parameter 3.15
Reference ressource 1
no
function
Control: Analog signal 4-20 mA for -1 / 12 bar
is connectected on input 54
Control Input 54: switch it on I position
(switch located back to the local control panel)
Fig 10
Fig 11
Fig 12
Bus
Start
between 13 55
Inc
or
po
ra
te
se
cu
rity
de
vic
es
on
27
in
pu
t
12 13 16 17 18 19 20 27 29 32 33
39
37
42 45 50 53
4
5
54 55 60 61
RS
48
5
Frequency converter Compressor Drive
®
Analog
output
Analog
input
Digital
output
1
2
3
CO
M
+1
0 V
0/4
-2
0 m
A
0/4
-2
0 m
A
CO
M
68 69
to external
fault relay
0/4
-2
0 m
A
0 ± 10 V or
4-
20
mA
Open Loop input 0-10V
