AK-PC 530 Instructions RI8LZ452 © Danfoss 05/2010 3
Compressor connections
Coupling
mode
Relay no.
Set
"C08"
to
Set
"C16"
to
Capacity step
All capacity steps are presumed to be
identical. The only exception is the set-
tings 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)
Compressor configuration when o61 =1 or 2 (This is where you can choose between the options shown.)
Setting "c16" will define the configuration.
Setting "c08" will define coupling mode.
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 configuration when o61 = 3 or 4 (This is where you must define 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 set-
ting 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 defined.
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.)
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