Catalogue GD 30 FDC Compressor 12-24-42 Volt D.C.
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COMPRESSORS
5. BATTERY PROTECTION SYSTEM
There is a protection system for the battery that prevents the compressor from operating if the available voltage becomes too low. The battery protection level should be set up as following:
❖ By programming:
Voltage limits for battery protection can be freely set, by the customer for every system (12-14V, 24-28V, 36-42V or special) by means of the serial port of a PC connected to the SPI of the electronic driver using the FDC programming package provided by ACC under request. In that option cut-out and cut-in values must respect the rule defined by Table 2.
Rated voltage range (V)
Cut-out (V)
AV
min
max
min
max
12 - 14
9.0
12.0
1.0
1.5
24 - 28
20.0
26.0
2.0
3.0
36 - 42
34.0
40.0
2.0
3.0
Special
9.0
40.0
1.0
3.0
Table 2. Limits of battery protection parameters
In Table 2, AV is the difference between cut-out and cut-in, that is, the cut-in value is the result of adding AV to the cut-out value.
❖ Externally, using COM, IN1 and IN2 of SPI:
This option prevents from the possibility of setting up the speed externally using COM, INI and IN2 of SPI as defined in point 6.
The external battery protection set up option must be previously programmed for external adjustment of the protection limits.
Voltage limits are set up by means of a PC through its serial port connected to the electronic driver's SPI. It can be done by ACC or by the customer itself using the FDC programming package.
The cut-out (battery voltage at which the driver stops operating) and the cut-in (battery voltage at which driver re-starts operation after a cut-off) values are set up by connecting the SPI connector terminals INI and IN2 to COM. According to the connection made, four protection levels can be selected as shown in Table 3.
Protection limits (V)
Rated operating voltage range
Protection level
Connection to COM
12 -14 V
24 - 28V
36 - 42 V
IN1
IN2
cut-out
cut-in
cut-out
cut-in
cut-out
cut-in
Standard
0
0
10.0
11.5
22.0
24.5
36.0
38.5
Low
1
0
9.0
10.5
20.0
22.5
34.0
36.5
High
0
1
11.0
12.5
24.0
26.5
38.0
40.5
Very high
1
1
12.0
13.5
26.0
28.5
40.0
42.5
Table 3. IN1, IN2 and COM connection for battery protection set up
0=open connection; 1=shortened
GD30FDC User Manual September 2006
DISTRIBUTED by PROCOLD S.r.l. -Italy- (+39) 011 917 22 02 info@procold.it
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