Access Flow2A Manual page 26

The drive unit
• An emergency stop at the ends of the rail
This is an extra safety mechanism that prevents the stairlift being able to ride of the rail. The mechanical
end stop will trigger the emergency limit switch opto coupler which is also used for the OSD. If triggered it
signals the electronics to perform an emergency stop.
Figure 4-11: Mechanical end stop triggers the OSD opto coupler sensor for an emergency stop
Position counter and rail data
The exact position of the lift is registered using an electronic pulse counter which counts the pulses coming from the
encoder on the shaft of the motor. The encoder generates pulses when the lift is moving along the rail. These pulses
are given to the electronics. When the lift moves up the pulse count increases. Each position on the rail corresponds
with a pulse counter value. The electronics uses the pulse counter as a table pointer. It points to a table that is
stored on the control board. This table is the rail data. This way the electronics can carry out the pre-programmed
actions at the right moment.
An action element consists of three fields:
• rail position
•
type of action
•
associated value
The following actions can be programmed:
•
Speed:
•
Angle:
• Halt locations:
• Park locations:
•
Rotation:
The size of the rail data table can vary and depends on the complexity and shape of the rail. This rail specific table is
stored in flash memory and delivered with the drive on a micro SDcard.
In case the rail data has to be modified it is also possible to enter the associated values at the customers home via
the service menu.
from 5 to 100 in steps of 5 (100 corresponds with 100mm/s)
swivel angle during movement of the lift from -110
from 0 to 9, H0 is always the charging contact
from 0 to 9, P0 is always the charging contact
from -110 to 110 in steps of 5 , can only be programmed at stop positions, the
rotation is only carried out when the driving control is active.
to 110 in steps of 5
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