January 2003
CI.46.C4.62
1
8238-15
The fan output can supply a continous current
of 0.5A
avg
. A higher current draw is allowed for 2
seconds during start.
LED (optional, Fig. 1)
A 10mA light emitting diode (LED) (6) can be
connected between the terminals + and D.
In case the electronic unit records an operational
error, the diode will flash a number of times. The
number of flashes depends on what kind of
operational error was recorded. Each flash will
last ¼ second. After the actual number of flashes
there will be a delay with no flashes, so that the
sequence for each error recording is repeated
every 4 seconds.
-
+
+
-
+
-
+
F
D
C
P
T
3
5
4
7
2
8
6
9
1
8380
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CI.46.C4.02 12-02
The electronic unit is a dual voltage device. This
means that the same unit can be used in both
12V and 24V power supply systems. Maximum
voltage is 17V for a 12V system and 31.5V for a
24V power supply system. Max. ambient tem-
perature is 55°C. The electronic unit has a built-
in thermal protection which is actuated and stops
compressor operation if the electronic unit tem-
perature gets too high.
Installation (Fig. 1)
Connect the terminal plug from the electronic unit
to the compressor terminal. Mount the electronic
unit on the compressor by snapping the cover
over the screw head (1).
Power supply (Fig. 1)
The electronic unit must always be connected
directly to the battery poles (2). Connect the plus
to + and the minus to -, otherwise the electronic
unit will not work. The electronic unit is protected
against reverse battery connection.
For protection of the installation, a fuse (3) must
be mounted in the + cable as close to the battery
as possible. 15A fuse for 12V and 7.5A fuse for
24V circuits are recommended.
If a main switch (4) is used, it should be rated to
a current of min. 20A.
The wire dimensions in Fig. 2 must be observed.
Avoid extra junctions in the power supply system
to prevent voltage drop from affecting the battery
protection setting.
Battery protection (Fig. 1)
The compressor is stopped and re-started again
according to the decided voltage limits measured
on the + and - terminals of the electronic unit.
The standard settings for 12V and 24V power
supply systems appear from Fig. 3.
Other settings (Fig. 4) are optional if a connection
which includes a resistor (9) is established
between terminals C and P.
In solar applications without a battery a 220 k
Ω
resistor is recommended. In AEO (Adaptive Ener-
gy Optimizing) speed mode the BD compressor
will always adapt its speed to the actual cooling
demand within a random operation voltage of
9.6 to 31.5V.
Thermostat (Fig. 1)
The thermostat (7) is connected between the
terminals C and T. Without any resistor in the
control circuit, the compressor with electronic unit
101N0210 or 101N0220 will run with a fixed speed
of 2,000 rpm when the thermostat is switched
on.
With the thermostat directly connected to
terminal C the electronic unit 101N0300 will adjust
its speed to the actual cooling demand.
Other fixed compressor speeds in the range
between 2,000 and 3,500 rpm can be obtained
when a resistor (8) is installed to adjust the
current (mA) of the control circuit. Resistor
values for various motor speeds appear from
Fig. 5.
Fan (optional, Fig. 1)
A fan (5) can be connected between the
terminals + and F. Connect the plus to + and the
minus to F. Since the output voltage between the
terminals + and F is always regulated to 12V,
a 12V fan must be used for both 12V and 24V
power supply systems.
Fig. 1
Optional battery
protection settings
24V max.
Voltage
31.5
31.5
31.5
31.5
31.5
31.5
31.5
31.5
31.5
31.5
31.5
31.5
31.5
31.5
31.5
24V cut-in
V
22.7
22.9
23.2
23.4
23.7
23.9
24.2
24.5
24.7
25.0
25.2
25.5
25.7
26.0
24V cut-out
V
21.3
21.5
21.8
22.0
22.3
22.5
22.8
23.0
23.3
23.6
23.8
24.1
24.3
24.6
12V max.
Voltage
17.0
17.0
17.0
17.0
17.0
17.0
17.0
17.0
17.0
17.0
17.0
17.0
17.0
17.0
12V cut-in
V
10.9
11.0
11.1
11.3
11.4
11.5
11.7
11.8
11.9
12.0
12.2
12.3
12.4
12.5
10.9
12V cut-out
V
9.6
9.7
9.9
10.0
10.1
10.2
10.4
10.5
10.6
10.8
10.9
11.0
11.1
11.3
9.6
Resistor
(9) k
Ω
0
1.6
2.4
3.6
4.7
6.2
8.2
11
14
18
24
33
47
82
220
Fig. 4
ENGLISH
Max length*
m
24V
operation
5
8
12
20
Cross
section
mm
2
2.5
4
6
10
Max length*
m
12V
operation
2.5
4
6
10
Wire dimensions
Fig. 2
*Length between battery
and electronic unit
Fig. 3
24V cut-out
V
22.8
12V cut-in
V
11.7
24V cut - in
V
24.2
12V cut-out
V
10.4
Standard battery protection settings
Number
of
flashes
Error type
Thermal cut-out of electronic unit
(If the refrigeration system has been too
heavily loaded, or if the ambient temperature
is high, the electronic unit
will run too hot).
5
Minimum motor speed error
(If the refrigeration system is too heavily
loaded, the motor cannot maintain minimum
speed 1,850 rpm).
4
Motor start error
3
(The rotor is blocked or the differential
pressure in the refrigeration system is too
high (>5 bar)).
Fan over-current cut-out
2
(The fan loads the electronic unit with more
than 1A
peak
).
1
Battery protection cut-out
(The voltage is outside the cut-out setting).
Instructions
Electronic Unit for BD35/50F Compressors,
101N0210, 101N0220 and 101N0300, 12-24V
Fig. 5
Motor
speed
rpm
2,000
2,500
3,000
3,500
AEO
2,000
2,500
3,000
3,500
Resistor
(8)
Ω
0
277
692
1523
0
173
450
865
1696
Contr.circ.
current
mA
5
4
3
2
6
5
4
3
2
Compressor speed
Electronic
unit
101N0210
101N0220
101N0300
with AEO
