MK5
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NX
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- 80 ELECTRONICS 8-22 Part No. 1122140
How to solve it?
Electronic Adjustments:
1) Load the standard proportional performance or learner indoor program. These
have moderate torque levels that should provide adequate power on a well-
balanced chair.
2) Be certain the user is selecting an appropriate drive mode for the intended
environment. In other words, Learner Indoor programs - unmodified - are not
intended to be used over rough outdoor terrain.
3) If the chair feels like it needs more power, then FIRST check the power level
setting in EACH drive. Most are set at 80% or lower. Simply increase this param-
eter and re-save. If more power is still needed, then the torque parameter can
be increased. Torque should never need to be maxed out. If it is then there is
another problem (i.e. front loading or a drive motor that is not powerful enough
for the task).
4) With power level at 100% a very high Torque setting and fast speeds, you could
be going into current rollback more quickly because of the amount of current
being allowed into the system.
Drive Motors:
The standard 4 pole is rated for loads up to 300 lbs. and the heavy duty 4 pole and
gearless/brushless motors are rated for loads up to 400 lbs. If the standard 4 pole is not
providing enough power once the above has been done, then the user would be a
candidate for the heavy duty 4 pole or gearless/brushless motor. Remember heavy duty
drives are not just for users over 300 lbs., but also for users who are very ACTIVE. If
the provider knows that the user is a very hard user, then they are better served going
to the heavy duty 4 pole or gearless/brushless from the start.
COMMON Mistakes:
The most common mistake and aggravation to current rollback is that the user or
provider turns the chair off to cool down. The controller has a counter in it that begins
to count up when the current reaches a high or extremely high level. Once the chair
current is normal again, then it needs to count down. It can only do this with the chair
turned ON.
If the user claims to be in a state of constant current rollback, then chances are that
they are turning their chair off and the counter is remaining high, so that it only takes a
little bit of driving to go back into rollback. Good advice is to ask the user to recharge
the batteries with the chair electronics turned on. This ensures the “Internal Timer” in
the controller is zeroed and the batteries are full.
NOTE: Use the charger that is supplied with the Invacare wheelchair.
SERVICE SECTION IX CURRENT ROLLBACK
CUURENT ROLLBACK
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