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Annex
48
Connection of the compressor line pressure sensor
Example of a compressor with a passive 4..20mA line pressure sensor
Danger
For compressors that are not equipped with independent over-pressure detection it is recommended that a
pressure switch be incorporated in the compressor fault circuit(s) such that any local over-pressure condition
will stop the compressor independently from the GD Connect 12.
Compressor module (VSD)
Analog input AI-1
Analog output AO-1
Compressor control
Analog input
Line pressure sensor
Compressor
Line pressure sensor
Type adjustment AI-1 / AO-1:
4-20mA: Jumper 21-22
0-10V: Jumper
22-23
0-5V:
Jumper 24-23
Internal relay AI-1 with AO-1
short circuits terminals 25-28
Compressor module (VSD)
28 (IN) AI-1
25 (OUT) AO-1
26 (GND)
21
22
Compressor
Line pressure sensor
+
-
Compressor control
Analog input
Line pressure sensor
+U
B Sensor
GND IN