Invacare Hydra C650PW, Owner'S Manual, Page: 100 / 126

Chapter 5 : Diagnostics
13
3.2.6 Drive Control Input (DCI) Connections
SHARK provides support for an On-board Battery
Charger (OBC), an ‘inhibit’, a ‘speed limit’ and a ‘swivel’
function through the Drive Control Input (DCI) socket as
shown below.
It is recommended that the largest gauge wire
supported by the Shark contacts (16 AWG/1.3 mm
2
) be
used.
Drive Control Input (DCI)
The DCI allows the powerchair speed and configuration
to be adjusted depending on the resistance of the DCI “Loop”. The loop can
be set to be ‘Off’, ‘Normally Open’ or Normally Closed’.
•
Inhibit - Prevents the powerchair from driving, typically when the chair
is being charged, or when a seat is raised or tilted.
•
Speed Limit - Automatically limits the drive speed to a pre-
programmed value, typically when a seat is raised or tilted and driving
too fast may be dangerous. The value to which it slows down is
programmable.
•
Swivel – Automatically swaps the drive motor polarities when the
powerchair swaps (or swivels) between front and rear wheel drive.
When the ‘Active Drive Program’ is set to ‘DCI Input 1+2’, Swivel will
change into a ‘Drive Program Swap’ mode and will automatically swap
from Drive Program 1 to Drive Program 2 whenever the DCI “Swivel” is
active. In this case, the motor polarities will not reverse, unless
specified within the set up of the Drive Program.
To determine the function, an appropriate resistance must be placed across
the DCI Input pin (
I ) and the DCI ground ( - ) pin. Depending on the
resistance value, SHARK will inhibit, limit or swivel driving.
Normal Speed Limit Swivel
Speed Limit
Inhibit
Nominal DCI Loop Resistance ( ± 5% )
Resistance
(
Ω
)
0 (>560)* 120 330
120 + 330
(450 nominal)
>560 ( 0 )*
SHARK
Information
Gauge
-
Right GREEN
indicator will
flash
-
Right GREEN
indicator will
flash
Right to left chase
followed by
steady display