Danfoss GD30FDC Application guide
Application guidelines
Danfoss Light Commercial
Refrigeration Compressors
GD30FDC
Direct Current, 12-42 V, Mobile Applications
http://cc.danfoss.com
Content
About the product ................................................................................................................4
Wiring and Connections ......................................................................................................5
The serial port interface (SPI) ..............................................................................................7
Operating voltage ................................................................................................................8
Battery protection system ..................................................................................................9
Setting up the speed ..........................................................................................................10
Programming the electronic driver ..................................................................................12
Protections and alarms ...................................................................................................... 13
Compressor Cooling ...........................................................................................................14
Supply .................................................................................................................................14
Dimensions .........................................................................................................................15
Technical Data ....................................................................................................................16
3FRCC.PC.040.A1.02
About the product
Many vehicles for transportation of goods or
recreation, such as trucks, caravans, boats, cars,
etc. are often equipped with cooling appliances.
The compressors for such mobile applications
must be designed to operate from a low voltage
DC power supply. These compressors must also
be compact in their dimensions, highly reliable
and yield high performances.
GD30FDC is an answer to the needs of users
requiring comfort and reliability in their
travelling, either on holidays, at work or in
any other circumstance where a DC powered
refrigerator is utilised. The GD30FDC is designed
to operate silently, eciently and reliably even up
to angles of tilt of 30º, working with refrigerant
R134a. Its design is based on the “D” series, which
has been successfully present in the market since
1984, and has had sales of 15 million units.
GD30FDC compressor is not designed for oroad mobile applications. If you are interested
in this type of mobile applications, it has to be
specically approved by the manufacturer.
GD30FDC can be powered at any voltage within
the 12 to 42V DC range, and is designed for
capillary tube expansion. Each unit is supplied
with a dedicated electronic driver (FDC1), which
features all the protections for both the battery
and the driver itself, including the compressor
motor. The driver automatically adjusts itself to
the voltage of the power supply.
Evaporation temperature range: -30ºC to +10ºC.
Condensation temperature range: up to 65ºC.
Pull-down peak: 70ºC.
Ambient temperature range: -10 to 55ºC (65ºC at
starting).
In case of ambient temperature lower than 0ºC,
an oil heater will be needed.
FDC1 electronic driver includes Smart Speed® as
programming option, which is a plug-in system
for automatically self adapting compressor speed
to current thermal load.
Smart Speed® reduces the number of thermostat
cycles by minimizing compressor speed,
enlarging on-time at every thermostat cycle,
so that start/stop energy loses are substantially
reduced. Lowest speed yields also highest
evaporating temperature, and so highest C.O.P
and lowest energy consumption. Pull-down is
done at maximum programmed speed, so pulldown time is very short with respect to xed
speed systems. No design parameters neither of
the compressor nor the appliance are required to
be programmed, so Smart Speed® can be easily
used in all appliances with no design eorts.
FDC1 electronic driver includes also Sleep and
Sleep Energy Saving as programming option,
which is a plug-in system specially conceived
for mobile air conditioners avoiding any other
electronic device. Sleep and Sleep Energy Saving
makes the air conditioner work for four hours
since start-up. Sleep Energy Saving makes the
compressor run at maximum programmed speed
during the rst hour, when highest cooling
capacity is needed, and lowers compressor speed
progressively to minimum velocity three hours
later. Maximum comfort and minimum energy
consumption is thus achieved.
GD30FDC starting capability is as low as 10V
under any balanced pressure. It also admits a
certain remaining dierential pressure when
thermostat o-time is abnormally short. For
improving even more the starting capability,
FDC1 electronic driver is supplied with a 3
minutes minimum thermostat o-time. The delay
is a programming option which can be easily
removed if no delay is preferred for any reason.
4 FRCC.PC.040.A1.02
The electronic control unit FDC1 is supplied with
the exclusive Serial Port Interface (SPI), featuring
a RJ11 telephone type connector. SPI allows the
electronic driver to be connected to a computer
for programming purposes using the FxC
programming package (hardware and software,
provided by the manufacturer upon request),
and allows the communication with an Electronic
Integral Manager of the appliance (EIM), and
making the compressor work in slave mode.
FDC1 also includes a 1 second lter at the
thermostat input to prevent the appliance from
wrong operation due to typical micro switching
produced by vibrations in those appliances that
t tilt switches at the thermostat circuit. So,
analogical ltering is not needed.
Wiring and Connections
General rules
GD30FDC must always be powered through
the dedicated electronic driver FDC1, which
is supplied with the compressor as a separate
device.
NEVER CONNECT THE COMPRESSOR’S HERMETIC
PINS (FUSITE) TO THE TERMINALS OF A BATTERY
OR ANY OTHER DC OR AC SOURCE DIRECTLY.
DO NOT TRY TO FIT AN ELECTRONIC DRIVER
OTHER THAN THE FDC1. THE COMPRESSOR WILL
NOT OPERATE AND IRREVERSIBLE DAMAGE MAY
OCCUR.
The FDC1 driver is directly connected to the
battery poles as well as to the compressor pins.
It checks battery voltage and adjusts itself to the
voltage value for proper compressor operation,
or switches itself o if the battery voltage is not
adequate. The driver also controls the compressor
speed.
ALWAYS RESPECT THE POLARITY OF THE BATTERY
WITH THE POWER INPUT TERMINALS OF THE
ELECTRONIC DRIVER.
The unit is protected against damage caused by
wrong polarity of the supply, The compressor will
not run correctly if it’s wrongly connected.
“-“ POWER INPUT TERMINAL OF THE ELECTRONIC
DRIVER SHOULD BE REFERRED TO THE CHASSIS
OF THE VEHICLE AS WELL AS THE APPLIANCE
FRAME*
A FUSE MUST BE PLACED BETWEEN THE “+” POLE
OF THE BATTERY OR DC POWER SUPPLY AND THE
“+” POWER INPUT TERMINAL OF THE ELECTRONIC
DRIVER*
12V SYSTEMS: 30A FUSE
24V SYSTEMS: 15A FUSE
42V SYSTEMS: 10A FUSE
In some special vehicles chassis is connected to
“+” terminal of the battery instead of “-“ terminal
(positive reference systems). In such cases “+”
should be understood as “-“ and vice-versa.
In systems powered by a variable DC source, the
fuse should be selected following the rules above
mentioned, considering the maximum voltage at
the variable DC Source.
Voltage drop in the
power leads
Table 1: Maximum length
of leads (m)
To avoid excessive voltage drop in the leads, their
length and cross section must be related to the
voltage supply as indicated in Table 1.
Cross section mm
2.5 1.5 3 4.5
4 2.5 5 7.5
6 4 8 12
10 6 12 18
2
12 - 14 V 24 - 28 V 36 - 42 V
If any kind of connector or switch is placed
between the battery poles and the power
terminals of the electronic driver, its resistance
should be less than 10mΩ. If the resistance is
Rated Operating Range
higher than 5mΩ, the maximum length of the
wires indicated in Table 1 should be halved or the
cross section doubled.
5FRCC.PC.040.A1.02
Wiring and Connections
Wiring Diagram
Fig 1. FDC1 Wiring
scheme
The FDC1 electronic driver features a terminal
board where all connections are made. The
terminal lay out is described in Figure 1:
Fig 2. Connection of the
FDC1 electronic driver to
the compressor
When connecting the electronic driver to the
compressor, any position of the connector
is possible under an electrical point of view.
However, in practice, the vertical position is not
possible because the electronic box cannot be
assembled. The connector should be rotated 120º
clockwise or counter clockwise with respect to
the vertical position as shown below.
6 FRCC.PC.040.A1.02
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