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4. Sensor control board and sensors
The Sensor Control Board is the board which is more or less ‘responsible’ for keeping the chair frame
level.
Information to keep the chair frame horizontal is gathered out of 2 sensors.
The first sensor is the Drive Rotation Sensor.
The Drive Rotation Sensor is mounted at the Sensor Control Board, which is mounted at the side the
drive unit.
This sensor is a gyro and gives information about the rotation of the drive unit.
When rotation of the drive unit is measured the Sensor Control Board commands the level board to
run the level motor.
Depending of the speed of this rotation the Sensor Control Board can command the Main board to
slow down the Main motor.
The second sensor is the Chair sensor.
This is a level sensor or angle sensor and is mounted on the chair frame.
This sensor is used as the reference for level and measures the actual angle of the chair frame.
The signal is used to compensate the fault angle of the chair frame. (feedback)
Sensor Control Board Chair Sensor Tilt Sensor
300902 300904 300903
To be able to use the information of the sensors, you need to calibrate this sensors first.
Calibration needs to be done when the lift is standing still and when the chair frame is level
Cause every sensor has its own offset, you always need to do this at a new lift, or when you have
exchanged the Sensor Control Board or when you have exchanged the Chair sensor.
This ‘calibration’ is described in chapter 5.4 of this document.
In case of a system fault it is possible that the system does not respond correctly to input signals.
Therefore we have mounted a Tilt sensor in the system.
This Tilt sensor breaks the power supply to the motor drivers when chair frame reaches the fault
angle of 5 degrees.
Attachment ‘300_schematic’ shows in detail how safety-lines are interconnected in the system.
It is also possible to change the dynamics of the complete leveling system.
See chapter 5.6 of this document
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