Invacare Motion Concepts Ultra Low Maxx, Service Manual Supplement, Page: 30 / 100

Invacare® Ultra Low Maxx by Motion Concepts
Trigger parameter in the wheelchair setup. See Modifying
Seating Parameters with PC tool or iOs tool in the LiNX
service manual.
After the angle has been set, ensure the drive lockout is
tested. Readjustment may be required.
The DLO limit should always be set to the angle
that best meets the individual needs of the user
and overall stability of the wheelchair. However,
the DLO angle should not exceed the maximum 60°
(TDX SP2)/50° (Storm
4 ) backrest angle.
Speed Reduction Microswitch for Power Elevating Seats
All PPS with power elevating seats (PES) are fitted with
a microswitch for the speed reduction. This microswitch
reduces the speed by 30 % when the seat actuator is
elevated beyond a recommended 100 mm (4 in, TDX
SP2)/10 mm (3/8 in, Storm
4 ) limit, measured from the
home (lowest) position. The speed reduction microswitch
functions as a ‘normally closed’ circuit. This provides fail
safe operation. As soon as the seat is elevated over the
100 mm (4 in, TDX SP2)/10 mm (3/8 in, Storm
4 ) limit, the
switch is opened and the speed reduction is engaged.
Ensure the speed reduction microswitch is tested after
installation. Readjustments may be required.
Fig. 5-4
The speed reduction microswitch is located in the lower
left corner at the rear of the lifter module
A .
Setting Max. Back Angle Limit Switch
All PPS are available with a max. back angle limit function.
This function prevents the back angle from extending
beyond a pre-set angle. The correct max. back angle limit
differs for each installation. The limit switch should be set
so that with any combination of tilt and recline, there is
no chance of interference between the backrest of the PPS
and the wheelchair base or any accessories located at the
back. The recline angle should never extend beyond the
recommended minimum gap of 10° from the horizontal
(see graphic below).
Fig. 5-5
The max. back limit switch will need to be set to
best meet the needs of the user. However, the
recline angle should not be permitted to extend
beyond the recommended minimum gap of 10°.
– Ensure base is on a level surface when
adjusting limits.
After the back angle has been set, ensure the max. back
angle limit is tested. Readjustments may be required.
Fig. 5-6
For a tilt/recline seating system, the switch A is typically
mounted to the side of the actuator module mounting
bracket on the back of the system.
5.3 Center of gravity (CG) adjustments
(forward and aft)
The Ultra Low Maxx power positioning system may be
adjusted in the forward and aft direction when being
mounted onto a power base. Several factors must be
considered when determining the correct position for the
user, including the clients weight distribution and body
type. It is very important to ensure adequate stability is
maintained during driving, and in the various powered
seating positions. When determining a suitable system for
a client, it is equally important to ensure that the user’s
weight does not exceed (the lesser of) the calculated
wheelchair weight capacity or the designated power
positioning system (PPS) weight capacity.
Important information (for dealers and users)
The Ultra Low Maxx power positioning system is designed
to accommodate a wide range of user needs. Only the
dealer and the healthcare professional can ensure that
the system meets the user’s individual requirements. It is
the dealer’s responsibility to ensure that the wheelchair
and the power positioning system are set up properly and
safely for the end user’s specific needs.
Stability
By changing the seating position (tilting, reclining, or
elevating), the user is changing the stability characteristics
of the wheelchair. It is very important that the system is
set up so that it is stable in all seating positions. When
evaluating stability, remember the following:
• The Ultra Low Maxx system can be mounted onto the
power base in various fore and aft positions. Make
certain that the position selected provides the user
with maximum stability over the full range of seating
positions.
• Consider all personal gear and accessories (backpacks,
vent systems, extra batteries, etc.) that will be
carried on the wheelchair. For example, a loaded
backpack, attached to the back of the seating system,
can significantly reduce the rearward stability of the
wheelchair. Consider the backrest being used. For
example, a recessed backrest can shift the user’s
center of gravity back and significantly reduce the
rearward stability of the wheelchair. Conversely, a
thick back cushion will shift the user forward and
reduce the wheelchairs forward stability.
• Consider the seat cushion being used. A thick seat
cushion will raise the user’s center of gravity and
reduce the wheelchair’s stability in all directions.
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