72 CompTrol Interface V4.0.x | Issue 21-05-2021 | 1000932
Program 8 – direct frequency request
14.4 Analog input
Note
●
When running program 8, also set DIP switch SW4-3 on the outdoor unit PCB of the FDC out-
door unit to ON (see FDC series Technical Manual).
●
If there is no input voltage, e.g. due to a broken wire or open input, a frequency of 0 Hz is
transferred. The input must remain permanently active.
●
Analog input X3-S is only evaluated if a signal is applied to digital input X2b-D4 (see “5.1
Functions of analog input X3” on page 23).
●
Analog signal conguration must always begin at 0 V DC or 0 mA, to prevent signal distortion
due to electrical induction.
Schematicdiagram:Compressorfrequencycontrolviaananalogsignal
The diagram below charts the control behavior of one CompTrol Interface expansion module for
actuating an outdoor unit with a maximum frequency fmax Heating of 75 Hz. The compressor fre-
quency is controlled by the analog signal and depends on the outdoor unit model set via DIP
switches S1-5 and S1-8. The compressor frequencies fmin, fmax Heating, and fmax Cooling are
permanently set for the outdoor unit in question.
0
10
20
f
min
f
max
Heating
f
max
Cooling
50
60
70
0 1 1,4 1,8 2,2 2,6 3,0 3,4 3,8 4,2 4,6 5,0 5,4 5,8 6,2 6,6 7,0 7,4 7,8 8,2 8,6 9,0 9,4 9,8 10
Compressor frequency
[Hz]
Voltage [V DC]
Heating
Cooling
Legend
0 0,5 0,7 0,9 1,1 1,3 1,5 1,7 1,9 2,1 2,3 2,5 2,7 2,9 3,1 3,3 3,5 3,7 3,9 4,1 4,3 4,5 4,7 4,9 5
0 2 2,8 3,6 4,4 5,2 6,0 6,8 7,6 8,4 9,2 10 10,8 11,6 12,4 13,2 14 14,8 15,6 16,4 17,2 18 18,8 19,6 20
0 5,6 6,2 6,9 7,5 8,2 8,8 9,4 10,1 10,7 11,4 12 12,6 13,3 13,9 14,6 15,2 15,8 16,5 17,1 17,8 18,4 19 19,7 20
Voltage [V DC]
Current [mA]
Current [mA]
Type of input signal 0-5 V DC
Type of input signal0-20 mA
Type of input signal 4-20 mA
Type of input signal 0-10 V DC
40
30
Figure 15: Analog signal and compressor frequency on a direct frequency request
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