NCTE S-BB-RT User manual

BOTTOM BRACKET SENSORS
FOR E-BIKES
S-BB-RT
S-BB-R
S-BB-RP
NCTE AG
Raiffeisenallee 3, 82041 Oberhaching
28.01.2022
Revision 4.0

Bottom bracket sensors for E-Bikes
NCTE
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Technical data
▪Rated torque 200 Nm, unidirectional and bidirectional (S-
BB-RT only)
▪Service temperature: -20 °C to +70 °C
▪Protection class according to EN 60653: IP64
▪Output signal torque: 0-5 V
▪Integrated angle sensor for detecting speed and direction
of rotation
▪Suitable for frames with BSA 68 and BSA 73 (other
options on request)
▪Compliant with DIN EN 15194:2018-11 for city and
trekking bike applications
The bottom bracket sensors S-BB-R, S-BB-RP and S-BB-RT are bottom brackets with integrated sensor
technology. The sensors are our long-standing and successful solution for detecting speed and direction of
rotation. The S-BB-RT sensor can additionally measure the torque on the crankshaft.
The measuring principle for torque measurement is based on magnetostriction and is completely without
contact. The robust design of all sensor types is specially developed for demanding use in e-bikes. Our many
years of experience show that our sensors are up to any requirements and do not need to be recalibrated
even after years of use. Our sensors have also proven their performance and durability in the laboratory.
They meet the requirements of DIN EN 15194:2018-11 for the city and trekking sector, as well as the 96-hour
salt-water spray test according to DIN EN 60068-2-252:2018.
Our torque sensor ensures that your e-bike rides the way your customers expect it to: dynamic, harmonious
and easy on the battery.
We are happy to supply our sensors for your small, medium and large series. Corresponding samples are
shortly available at any time.
Your benefits at a glance:
▪Completely non-contact measuring system
▪No recalibration necessary
▪Easy and intuitive mounting
▪Made in Germany
Short description

Bottom bracket sensors for E-Bikes
NCTE
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Sensor version
S-BB-RT
S-BB-R
S-BB-RP
Pulse generator (impulse/revolution)
32
32
72
Torque signal output bandwidth
250 Hz
-
-
Measuring range: Torque
±200 Nm
-
-
Signal quality: Torque
±2,5% FS bezogen auf Linearität
-
-
Torque error signal output
Dauerhaft ca. 2,5 V1
-
-
Characteristic value of the signal output
10 mV/Nm (+/- 2,5%FS)
-
-
Supply voltage
+7 …16 V DC
+3 … 18
V DC
+4,8 … 16
V DC
Signal output bandwidth angle sensor
4 kHz
Power consumption in operation
20 mA
Bearing
2x 61902-16-2RS
Shaft surface
Zinc-plated
Certification according to DIN ISO
15194:2017
Yes2
Sleeve
TECHNOMELT®
Thread
BSA 1,375x24
Protection class
IP 643
Salt water spray test according to
DIN EN 60068-2-252:2018
Test duration 96 hours passed4
Dynamic test according to
DIN EN 15194:2018-11
Test for city and trekking passed
Do not use magnets or magnetized tools during assembly, as this may change the
magnetic field of the shaft.
In this case, the bottom bracket can become permanently non-functional!
Any changes to the product will void the warranty.
1
With constant signal output during operation
2
The configuration of the test setup for product release can be obtained from NCTE on request.
3
In installed condition
4
In installed condition
Technical characteristics –S-BB-RT/S-BB-R/S-BB-RP

Bottom bracket sensors for E-Bikes
NCTE
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Housing width
Version
L2
±0,5 mm
Ltotal
±1,0 mm
68 mm
120 K
24,20
120,00
68 mm
120 L
26,20
120,00
68 mm /73 mm
128 K
28,20
128,00
68 mm /73 mm
128 L
30,20
128,00
68 mm /73 mm
133,6 K
29,20
133,60
68 mm /73 mm
133,6 L
34,85
133,60
68 mm /73 mm
136 K
28,20
136,00
68 mm /73 mm
136 L
38,20
136,00
For further information on other variants or dimensions, please contact our customer support:
[email protected].
Dimensions
Ltotal
L2
Housing width
square - SW
12,73 mm

Bottom bracket sensors for E-Bikes
NCTE
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Description
Signal
Cable color
Note
Supply voltage
+7 … 16 V DC
White
-
GND
0 V
Black
-
Chanel A
0 V / Open collector
Blue
16 CPR
Chanel B
0 V / Open collector
Brown
16 CPR
Torque
Offset 2,5 V at 0 Nm
Grey
10 mV/Nm
Output for hall sensors: Open collector with internal pull-up resistor 37 kOhm to +5 V.
Signal output and connection diagram for S-BB-RT

Bottom bracket sensors for E-Bikes
NCTE
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Description
Signal
Cable color
Note
Supply voltage
+3 … 18 V DC
White
-
GND
0 V
Black
-
Chanel A
0 V / Open collector
Blue
16 CPR
Chanel B
0 V / Open collector
Brown
16 CPR
No output
No signal
Grey
-
Output for hall sensors: Open collector without pull-up resistor
Signal output and connection diagram for S-BB-R

Bottom bracket sensors for E-Bikes
NCTE
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Describtion
Signal
Cable color
Note
Supply voltage
+4,8 … 16 V DC
White
-
GND
0 V
Black
-
Chanel A
0 V / Open collector
Blue
36 CPR
Chanel B
0 V / Open collector
Brown
36 CPR
No output
No signal
Grey
Output for hall sensors: Open collector with internal pull-up resistor 2.7 kOhm to +5 V.
Signal output and connection diagram for S-BB-RP

Bottom bracket sensors for E-Bikes
NCTE
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Angle sensor with 32 (72 for S-BB-RP) pulses for precise determination of speed and direction of rotation.
Angle sensor

Bottom bracket sensors for E-Bikes
NCTE
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Torque curve
0°
90°
180°
270°
360°
Torque
Rotation in degree
Output signal in V
Theoretical torque curve

Bottom bracket sensors for E-Bikes
NCTE
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Application
The bottom bracket sensors are used in all types of e-bikes. From city- to trekking- and cargo bikes. They
provide the necessary signals for a harmonious and individual riding experience with battery-saving motor
support. S-pedelecs can also be equipped with these sensors.
General
Please read this data sheet including the assembly instructions (at the end of this document) carefully before
first use and only use the product accordingly. Keep this for future reference to avoid any misuse. For correct
installation, please proceed according to the installation instructions. For more information, please contact
our customer service at [email protected].
Explanation and operating instructions refer only to the sensor in the condition in which it was placed on the
market. Parts subsequently attached by the end user and/or interventions subsequently made are not taken
into account.
Manufacturer
The manufacturer of the S-BB-R, S-BB-RP and S-BB-RT series sensors is:
NCTE AG
Raiffeisenallee 3
82041 Oberhaching
Germany
Phone: + 49 (0) 89 665 619-0
Intended use and installation range
The sensor is intended for use in bicycles with electric drive (pedelec, e-bike and electric bicycle) within the
meaning of Section 39 (7) of the German toad traffic regulations. Use the product only in bicycle frames with
a BSA threaded bottom bracket and a frame width of 68 mm or 73 mm. Crank arms must be mounted on the
square shaft ends. The sensor S-BB-RT measures the torque applied by pedal and crankshaft at the left crank.
All sensors record speed and direction of rotation. For safety reasons, the motor support may only be
activated if both speed outputs provide several correct and plausible signal sequences.
For this purpose, the direction of rotation and the speed must be determined from both signals and checked
for sensible limit values.
Any other use is considered improper and may result in property damage or even personal injury. The
manufacturer accepts no liability for damage resulting from improper or incorrect use.
Instruction manual

Bottom bracket sensors for E-Bikes
NCTE
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Possible error cases
In case of an unexpected defect of the electronics, it outputs a constant value of approx. 2.5 V, the value
corresponds to a torque of 0 Nm.
If the sensor is blocked, please contact the manufacturer immediately and do not continue to use the
product.
Scope of delivery
The sensor system consists of a calibrated sensor, including a connection cable (corresponding to the
configuration) and a loose adapter. In case of the BSA 73 mm variant, an additional spacer is included in the
right bearing shell. The signal recording and processing is integrated in the housing.
Handling and transport
During handling, storage and transport make sure the sensor is not exposed to magnetic fields (e.g.
demagnetizing coils or permanent magnets). It must also be ensured that no magnetic tools are used during
mounting.
Important technical safety instructions
▪Opening the sensor is not permitted.
▪The sensor must not be subjected to any mechanical loads when not installed (drops, knocks,
vibrations, etc.).
▪To prevent damage caused by a short circuit on the connecting cable, a suitable back-up fuse (approx.
1 A nominal current) must limit the current supply to the sensor.
▪The sensor may only be operated within the permitted load limits. These can be found accordingly
in the standard DIN 15194:2018-11 and ISO 4210:2018. Cycles Safety requirements for bicycles part
2: Requirements for city bicycles chapter 4.13: Pedals and pedal/crank drive system
▪Reverse polarity or overvoltage on the connecting leads can damage the sensor.
▪Routing the wires outside the bike frame can cause interference with the sensor. NCTE recommends
routing the connection and data lines inside the frame. If internal routing is not possible for technical
reasons, the irradiance sensitivity must be re-evaluated accordingly by the EPAC manufacturer.
Disposal
Dispose of the article and all associated components via an authorized disposal company. Observe the
currently applicable regulations. If in doubt, contact your waste disposal facility to find out about
environmentally compatible disposal.
Service
Contact
Phone: [phone]
E-Mail: [email protected]

Bottom bracket sensors for E-Bikes
NCTE
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Cleaning
The sensor can be wiped with a dry cloth. In case of heavy soiling, the sensor can alternatively be wiped damp
with a solution of lukewarm water with a little dishwashing detergent.
Cleaning with a high-pressure cleaner can damage the ball bearings.
Contact or cleaning of the sensor with liquids containing solvents is not permitted
EC conformity
The product meets the requirements of the European Union and has a corresponding CE certificate. For
further information, please contact our customer support: [email protected]e
1. The threads of the adapter shells and the frame must be clean before
mounting. Possible dirt and burrs must be removed before mounting. The
threads must not be greased. The left adapter shell is tightened with a
bottom bracket tool with a torque of 30 Nm. For a bottom bracket width
of 73 mm, it must be ensured that the spacer ring is located in the adapter
shell.
2. The sensor cable is fed through the bottom bracket into the frame. When
inserting the sensor, the cable must not be kinked or pinched. The sensor
is secured against rotation by inserting it into the left adapter shell. The
right adapter shell is then also tightened with the bottom bracket tool to
a torque of 30 Nm.
NCTE AG
Raiffeisenallee 3
D-82041 Oberhaching
Germany
Internet www.ncte.de
Phone: [phone]
E-Mail: [email protected]
Montage