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l
oad regulatIon and InterfaCe
lIu - l
oad regulatIon and InterfaCe Board
The electronics of the LIU-PCB stabilizes the actual load of
the eddy current brake with given accuracy.
The signal of the rpm sensor (non-contact hall sensor)
and the feedback signal of the strain gauge module are
analyzed and the actual brake force adjusted.
In addition, the processor of the LIU board generates the
interface signals (RS-232 and USB) to external devices (e.g.
PC-ECG or ECG recorders).
Both signals (RS-232 and USB) are galvanically isolated
(opto couplers).
The LIU board is mounted directly on the electronic carrier
plate in the bottom of the ergometer.
The power supply (24 Volt) is connected to the LIU and fed
into the bus system.
The connection between DTU (control unit M) and LIU is
made by a patch cable (RJ-45 jacks); the other boards are
connected to the LIU by direct connectors.
1
2018111-336 Rev. B
2
3
9
eBike III basic / comfort
liu
board
1
direct connector for internal BUS system
2
connector to eddy current brake
3
RJ-45 connector for internal BUS system (DTU)
4
jumper for connecting the external COM module
5
RS-232 interface connector (galv isolated)
6
USB interface connector (galv isolated)
7
connector rpm sensor
8
connector DMS module (torque sensor)
9
connector power supply 24 V (from main switch)
4
8
7
5
6
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