NEWVSI TECHNICAL MANUAL – PROGRAMMING PG DRIVES TECHNOLOGY
44 SK80151-1
This parameter should only ever be set to off if there are no electrical brakes fitted to the wheelchair.
6.9 Joystick Stationary Time
If the joystick is held in a deflected position i.e. away from center for a period of time exceeding this value, it is assumed the
deflection is accidental and drive to the motors will be cut. The programmable range is 0-60 minutes in steps of 1 minute. A
value of 0 disables this function.
It is not normally necessary to adjust this parameter.
The value of Joystick Stationary Time has been selected by the wheelchair manufacturer in order
to minimize the risk of motor damage. Do not adjust these values without consulting the
wheelchair manufacturer. PGDT accept no liability for losses of any kind resulting from the
adjustment of these parameters.
6.10 Joystick Stationary Range
This sets the window within the joystick is considered to be stationary. It the joystick moves by more than this value, the timer is
reset.
It is not normally necessary to adjust this parameter.
The value of Joystick Stationary Range has been selected by the wheelchair manufacturer in
order to minimize the risk of motor damage. Do not adjust these values without consulting the
wheelchair manufacturer. PGDT accept no liability for losses of any kind resulting from the
adjustment of these parameters.
7 Motor Parameters
7.1 Current Limit Max.
This parameter sets the long term current output of the newVSI it is programmable between 20-50A in steps of 1Amp.
7.2 Current Foldback Threshold, Current Foldback Time and Current Foldback Level
These parameters can be used to protect the wheelchair motors from overheating. These parameters are closely related so are
dealt with in one section.
Current Foldback Time sets the period of time, which if exceeded will initiate a reduction in the maximum current output. This
parameter is programmable between 1-250 seconds in steps of 1 second.
Current Foldback Level sets the level of current reduction as a percentage of the Maximum Current Limit. This parameter is
programmable between 25%-100% in steps of 1%.
Current Foldback Threshold sets the current threshold at which the timer starts to run. This parameter is programmable between
20A and Current Limit Max. in steps of 1A
Example:
The parameters Time and Level can be used to protect the motors from overheating. If the motor current exceeds the value set
by Threshold for a period set by Time, then the newVSI’s current output will be reduced to a value set by Level.
After a fixed reset period of 5 x Current Foldback Time, the current output will be allowed to return to the full current, if demanded.
This reset period is to allow the motor(s) sufficient time to cool.
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