16
13. Options
The stairlift can be extended with extra powered options:
• Powered swivel chair
• Powered footrest raiser
• Foldable hinge
Logic
The grey communication loom provides a link between the MS125 pcb
and the 126 pcb.
The 126 connection on the MS125 pcb output is between 8-12
volts. Each time a 126 pcb is connected, the reading will drop by
approximately 0.8 volts as communication between the two pcb’s is
established.
The 126 pcb dip switch settings tell the MS125 pcb what powered
option is connected. Each dip switch setting is looking for different
parameters to determine when and where power should be applied to
the attached motor.
When the parameters are met, the MS125 pcb passes the battery
voltage through the communication loom to the 126 pcb. The 126 pcb
then reduces the output to the correct voltage for the attached motor
to power the option. Depending on which option is attached, voltage
would be applied to the motor for a set time or until the motor has hit a
stop, the 126 pcb has a stall current.
In case of a failure on the communication circuit, the lift runs, but the
options don’t function.
Powered swivel chair
The powered swivel chair swivels at the top and is operated from the
toggle. The lift shall be on the upper end limit switch and the board
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