Danfoss GLT80TDC Application Manuallines page 11

Setting up the speed
Table 4. External
selection of the velocity
0=Open connection
1=Shortened
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 the manufacturer with standard
running mode and external control of the
speed, with minimum speed of 2,000 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 FxC programming
package provided by the manufacturer upon
request. Running modes and options are:
• Standard mode:
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.
Connection to COM
IN1w
0
1
0
1
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.
When setting up a fixed speed, maximum speed
can be limited by the available battery voltage in
the following way, maximum speed would be:
· 2,000 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 connector
terminals IN1 and IN2 to COM for minimum,
maximum speeds, and two intermediate
velocities according to Table 4:
Speed of the motors (rpm)
IN2
0
0 Smin+1/3 (Smax-Smin)
1 Smin+2/3 (Smax-Smin)
1
• Smart Speed® mode:
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.
Smin
Smax
11
FRCC.PC.041.A1.02