TECHNICAL MANUAL
CVM 3000
C 5030 CV/04-99 GB
9
1.2
Pressure probes
The 16 4-2 mA type pressure transducers have a different meaning depending on the
software configuration given to the machine’s configuration parameters.
Number 16 pressure probes 4-20 mA 0-30 bar.
Terminals 17 to 32: signal inputs 4-20 mA.
Terminals 17-bis to 32-bis probe power supply 12 Vdc.
STANDARD UNITS AND
HEAT PUMPS WITH
TOTAL RECOVERY
UNITS WITH SCREW
COMPRESSORS
Terminals 17 18 19 20
High pressure per circuit
High pressure per circuit
Terminals 21-22-23-24
High pressure per circuit
High pressure per circuit
Terminals 25 26 27 28 29 30 31
32
Compressor oil pressures
Low pressure per circuit
Pressure [Bar]
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Current [mA]
4.00
4.27
4.54
4.80
5.07
5.34
5.61
5.87
Pressure [Bar]
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
Current [mA]
6.14
6.41
6.68
6.94
7.21
7.48
7.75
8.01
Pressure [Bar]
8.0
8.5
9.0
9.5
10.0
10.5
11.0
11.5
Current [mA]
8.28
8.55
8.82
9.08
9.35
9.62
9.89 10.15
Pressure [Bar]
12.0
12.5
13.0
13.5
14.0
14.5
15.0
15.5
Current [mA]
11.43 10.69 10.96 11.23 11.49 11.76 12.03 12.30
Pressure [Bar]
16.0
16.5
17.0
17.5
18.0
18.5
19.0
19.5
Current [mA]
12.56 12.83 13.10 13.37 13.63 13.90 14.17 14.44
Pressure [Bar]
20.0
20.5
21.0
21.5
22.0
22.5
23.0
23.5
Current [mA]
14.70 14.97 15.24 15.51 15.77 16.04 16.31 16.58
Pressure [Bar]
24.0
24.5
25.0
25.5
26.0
26.5
27.0
27.5
Current [mA]
16.84 17.11 17.38 17.65 17.92 18.18 18.45 18.72
Transducer checking procedure:
•
disable the compressors and leave the unit with only the “ON/OFF switch” ON;
•
disconnect the cable from the “bis” terminal;
•
place a tester between the “bis” terminal and the disconnected cable and read the
current value using a milliammeter (20mA bottom of scale);
•
read the pressure with a gauge placed near the pressure transducer;
•
compare the readings with the values shown in the table.
