Danfoss AK-PC 530 - System Configuration; Compressor Configuration (Modes 1 & 2)

AK-PC 530 Manual RS8EJ302 © Danfoss 05-2010 11
Compressor connections
Coupling
mode
Relay no.
Set
"C08"
to
Set
"C16"
to
Capacity step
All capacity steps are presumed to be identi-
cal. The only exception is the settings c16 = 4
and 21 to 26.
Coupling mode
Coupling mode 1 = sequential operation.
Coupling mode 2 = cyclic operation.
Coupling mode 3 = cyclic and binary
operation where the compressor capacities
are, as follows:
1: 9%
2: 18%
3: 36%
4: 36%
There is cyclic coupling at 3 and 4, and binary
on 1, 2 and 3/4.
(for c16=4 only)
Couplings
When there is cyclic operation and
connections with unloaders there will in some
capacity cutins and cutouts be overlappings
where the unloaders from either one
compressor or another may be active.
In such cases the unloaders on the compressor
with the lowest number of hours will be cut in,
and the others cut out.
The changeover will take place at 6-second
intervals.
Equalised operation
When c16 = 21 to 26, compressor 1 +
belonging unloader must have the same
capacity as each of the subsequent
compressors. The unloading function will
equalise the cut-in capacity when the
subsequent compressors are cut in and out.
Compressor 1 will always be operating.
Compressor conguration when o61 =1 or 2 (This is where you can choose between the options shown.)
Setting "c16" will dene the conguration.
Setting "c08" will dene coupling mode.
Compressor conguration when o61 = 3 or 4 (This is where you must dene yourself how the relays are to be activated.)
Survey of relays in Mix and Match operation
Relay no.
Calculation
value
Combination of relays that must be cut in
1 1 1 1 1 1 1 1 1 1
2 2 2 2 2 2 2 2 2 2
3 4 4 4 4 4 4 4 4 4
4 8 8 8 8 8 8 8 8 8
The sum of 1-8 is the
setting value for each step
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Example 2
If capacity step 1 has to cut in relay number 3 only, you must set c17 to 4.
If capacity step 2 has to cut in relay number 4 only, you must set c18 to 8.
If capacity step 3 has to cut in relay numbers 3 and 4, you must set c19 to 12.
Continue with a setting for c20 etc. until all capacity steps have been dened.
Capacity steps
Example 1
Settings:
c17 to 1
c18 to 2
c19 to 3
c20 to 4
c21 to 5
c22 to 6
c23 to 7
(Mix and Match used only on plants with up to 4 compressors.)