Assembly; Operation - Bosch BDU3741 Owner's Manual
Drive system drive unit
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Also See for BDU3741:
- Operating instructions manual (57 pages) ,
- Original operating instructions (53 pages) ,
- Supplement manual (48 pages)
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Checking the speed sensor (see figure A)
A
(3)
(1)
a)
(1) Speed sensor
(2) Spoke magnet
(3) CenterLock magnet
(4) Rim magnet
a) Different sensor shape and installation position possible
b) a different installation position is possible
Speed Sensor (slim)
The speed sensor (1) and its CenterLock magnet (3)
or spoke magnet (2) are mounted ex works in such a
manner that the magnet, after a turn of the wheel,
An operating unit is required for the starting opera-
tion of the eBike system. Observe the starting opera-
tion for the eBike system and drive unit control in the
operating unit operating instructions.
Notes on cycling with the eBike system
Note: The eBike system always starts in OFF mode
for drive units with a maximum speed of more than
20 mph.
When does the eBike drive work?
The eBike drive assists your cycling only when you are
pedaling. If you do not pedal, the assistance will not
work. The motor output always depends on the pedal-
ing force you apply.
Bosch eBike Systems
(2)
(4)
b)
Assembly
moves past the speed sensor with a clearance of at
least 2 mm, yet no more than 15 mm.
The correct distance between the magnet and sensor
must be maintained (see figure A) if design changes
are made.
(1)
Notes: Ensure that you do not damage the sensor or
sensor bracket when fitting or removing the rear
wheel.
When changing a wheel, make sure that the sensor
cable is routed so that it is not under tension and has
no kinks.
The CenterLock magnet (3) can only be removed and
reinserted up to five times.
Rim magnet
When installing a rim magnet, no sensor is required to
detect a wheel turn. The drive unit itself detects when
the magnet is close to it and calculates the speed and
any other data required from the frequency of the
emergence of the magnet field.
Since the drive unit is sensitive to magnetic fields,
avoid 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
If you apply less force, you will receive less assistance
than if you apply a lot of force. This applies irrespec-
tive of the assistance level.
The eBike drive automatically switches off at speeds
over 20/28 mph. When the speed falls below
20/28 mph, the drive automatically becomes avail-
able again.
An exception applies to the push assistance function,
in which the eBike can be pushed at low speed with-
out pedaling. The pedals may rotate when the push
assistance is in use.
You can also use the eBike as a normal bicycle with-
out assistance at any time, either by switching off the
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0 275 U07 3D1 | (23.03.2022)
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