Bitzer VARIPACK FMY+6-4 User Manual

CB-110-418
5.8 Operating modes
The VARIPACK frequency inverter can be operated in
two different operating modes:
• Capacity control of the compressor depending on an
external setpoint signal (see chapter Setpoint input
selection, page 18).
• Capacity control of the compressor depending on the
evaporation pressure, which will require the optional
extension module for pressure control (see chapter
Capacity control of the compressor as a function of
the evaporation pressure, page 19).
In addition to direct evaporation pressure control, the
condenser fan can also be controlled via a 0..10V
output signal and a second compressor can be con-
nected.
5.8.1 Setpoint input selection
The VARIPACK frequency inverters can be controlled
via parameter change (P1-13) with a 0...10V (factory
setting) or 4...20mA signal.
5.8.2 Capacity control of the compressor
depending on an external setpoint signal
(P2-27)
• With the "Min...Max" control characteristic, the com-
pressor starts up when the DI1 start-up command is
given. The setpoint signal provides linear frequency
control between the minimum and maximum fre-
quency of the compressor.
– If a 0..10V signal is used, it must be connected
to the input AI1 (6).
– If a 4..20mA signal is used, it must be connec-
ted to the input AI2 (10).
Graphical explanation of the "Min..Max" control char-
acteristic, see figure 9, page 18.
0
f [Hz]
I [mA]
4 8 12 16 20
4 .. 20 mA
f [Hz]
0 2 4 6 8 10 12
0
U [V]
0 .. 10 V
f
max
f
min
f
max
f
min
Fig.9: "Min..Max" control characteristic
Control characteristic "0..Max"
Alternatively, the control characteristic can be changed
by changing the parameter to "0..Max".
• With the "0..Max" control characteristic, in addition
to the DI1 (2) start-up command, a setpoint signal of
>1% (0.1V) is required for starting the compressor.
The setpoint signal presets the frequency to a value
between 0Hz and the maximum frequency. If the
signal is >1% but lower than the minimum frequency
of the compressor, the compressor will run at the
minimum frequency.
Graphical explanation of the "0..Max" control charac-
teristic, see figure 10, page 19.

Bitzer VARIPACK FMY+6-4 Specifications

General

Brand	Bitzer
Model	VARIPACK FMY+6-4
Category	Inverter
Language	English