Bosch BDU3740 Supplement Manual page 10

Drive unit, epac
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Product description and
specifications
Intended use
The drive unit is intended exclusively for driving your eBike
and must not be used for any other purpose.
In addition to the functions shown here, changes to software
relating to troubleshooting and functional modifications may
be introduced at any time.
Product features
Individual illustrations in these operating instructions may
differ slightly from the actual conditions depending on the
equipment of your eBike.
The numbering of the components shown refers to the illus-
trations on the graphics pages at the beginning of the
manual.
(1) Drive unit
(2) Speed sensor
a)
(3) Spoke magnet
(4) CenterLock magnet
b)
(5) Rim magnet
a) different sensor type and installation position is possible
b) different installation position is possible
Technical data
Drive unit
Product code
Continuous rated power
Torque at drive, max.
Rated voltage
Operating temperature
Storage temperature
Protection rating
Weight, approx.
The Bosch eBike system uses FreeRTOS
(see http://www.freertos.org).
Bicycle lights
A)
B)
Voltage approx.
Maximum power
– Front light
0 275 007 3D1 | (14.03.2022)
Bicycle lights
– Tail light
A) Depends on legal regulations, not possible in all country-specific
B) When changing the bulbs, ensure that they are compatible with
Inserting a bulb incorrectly can cause it to blow.
Information on the noise emissions of the drive
unit
Typically, the A-weighted noise emission level of the eBike
system is < 70 dB(A). A key feature of the 
service is that the drive unit will emit an alarm tone in re-
sponse to unauthorised movement of the eBike. This alarm
tone can exceed a noise emission level of 70 dB(A) and
measures 80 dB(A) at a 2 m distance from the drive unit.
The alarm tone is only available once the 
service has been activated and can be deactivated via the
app eBike Flow.
Assembly
Checking the speed sensor (see figure A)
Speedsensor (slim)
The speed sensor (2) and its CenterLock magnet (4) or
spoke magnet (3) are mounted ex works in such a manner
that the magnet, after a turn of the wheel, moves past the
Drive Unit
speed sensor with a clearance of at least 2 mm, yet no more
Performance Line
than 15 mm.
CX/Cargo/
CX Race Edition/
If any structural changes are made, the correct distance
Speed
between the magnet and the sensor must be complied with
(see figure A).
BDU3740
Note: Make sure you do not damage the sensor or the sensor
BDU3741
holder when fitting or removing the rear wheel.
BDU3760
When changing a wheel, make sure that the sensor cable is
BDU3761
routed so that it is not under tension and has no kinks.
BDU3780
The CenterLock magnet (4) can only be removed and rein-
BDU3781
serted up to five times.
W
250
Rim magnet
Nm
85
When installing a rim magnet, no sensor is required to detect
V=
36
a wheel turn. The drive unit itself detects when the magnet is
°C
−5 to +40
close to it and calculates the speed and any other data re-
°C
+10 to +40
quired from the frequency of the emergence of the magnet
field.
IP54
Since the drive unit is sensitive to magnetic fields, avoid
kg
3
other magnetic fields in the vicinity of the drive unit (e.g.
magnetic clipless pedals, magnetic cadence sensors, etc.) in
order to prevent disruption to the drive unit.
Operation
V=
12
A control unit is required for the starting operation of the
W
17.4
eBike system. Observe the starting operation for the eBike
A)
models via the eBike battery
the Bosch eBike system (ask your bicycle dealer) and are suit-
able for the specified voltage. Bulbs must only be replaced with
bulbs of the same voltage.
W
0.6
Bosch eBike Systems
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This manual is also suitable for:

Bdu3741Bdu3760Bdu3761Bdu3780Bdu3781