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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.
Compressor connections
Relay no.
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
Calculation
Relay no.
Combination of relays that must be cut in
value
1
1
1
2
2
2
3
4
4
8
The sum of 1-8 is the set-
1
2
ting value for each step
Example 1
EKC 531D1
Coupling
mode
Set
Set
"C16"
"C08"
to
to
1
1
1
1
1
2
2
2
2
2
4
4
4
4
4
8
8
8
8
8
3
4
5
6
7
8
9 10 11 12 13 14 15
Settings:
c17 to 1
c18 to 2
c19 to 3
c20 to 4
c21 to 5
c22 to 6
c23 to 7
Instructions RI8HU452 © Danfoss 10/2006
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)
1
1
2
2
4
4
4
8
8
8
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.
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.
3
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