COMPRESSORS
COMPRESSORS
It is possible to operate the compressor at fixed or variable speed under different running
modes, options and parameters. The electronic driver is supplied by ACC with standard running
mode and external control of the speed, with minimum speed of 1,500 rpm and maximum
speed 3,500 rpm. Default running mode, options and parameters can be changed to optimize
compressor performance for a given appliance, by programming, connecting a PC to the SPI by
means of the FDC programming package provided by ACC under request. Running modes and
options are:
Standard mode:
6.
SETTING UP THE SPEED
Compressor speed is a fixed programmed value or switched externally from programmed
minimum and maximum value in four steps. The switch should be connected to the SPI and
should remain plugged during compressor operation.
When setting up a fixed speed, maximum speed can be limited by the available battery voltage
in the following way, maximum speed would be:
.
1,500 rpm when the battery voltage is equal to the cut-in voltage.
.
Programmed fixed speed when the battery voltage is equal to or greater than the maximum
nominal voltage (14V, 28V and 42V for 12V, 24V and 42V systems respectively).
.
A linear function of the battery voltage in the range between the cut-in and the maximum
nominal voltages.
This option is particularly useful for eutectic plates systems.
If external switching is programmed, the speed is set up by the connection of the SPI terminals
IN1 and IN2 to COM for minimum and maximum speeds, and two intermediate velocities
according to Table 4:
External speed set up option must be previously programmed for external adjustment of its
minimum (Smin) and maximum (Smax) limits.
External switching prevents from the possibility of setting up the battery protection externally
using COM, IN1 and IN2 of SPI as defined in point 5.
Compressor will run at variable speed at its highest performance depending of the current
thermal load. The speed can be limited by a fixed programmed value and even more by the
available battery voltage as described in standard mode. The speed can also be limited by
external switching in the same way as described in standard mode.
IN1
IN2
0
0
0
1
1
1
Smin
Smin + 1/3(Smax-Smin)
Smin + 2/3(Smax-Smin)
Smax
0
1
Table 4. External selection of the velocity
0=Open connection 1=Shortened
Speed of the motors (rpm)
Connection to COM
❖
Smart Speed® mode:
❖
September 2006
7
GD30FDC User Manual
DISTRIBUTED by PROCOLD S.r.l. - Italy - Tel: (+39) 0161 42 44 52 - [email protected]
