2.3.1
DCI – Analog Mode
When the Digital Input setting is set to ‘No’, the DCI will limit the drive speed of the
chair to a value proportional (linear) to the resistance of the DCI Loop, typically
through use of an analog potentiometer. A loop resistance of 220 ohms will have no
effect on the chair speed, while a value of 56 ohms will cause the chair to slow down
to the value set in Reduced Speed.
Normal
Speed Limit
Inhibit
Speed Limit
Inhibit
Nominal DCI Loop Resistance ( ± 5%)
Resistance (
Ω
)
0 (>560)* 56 - 220
330
(56 – 220) + 330
(450 nominal)
>560 (0)*
* When Standard/Fail-safe is set to ‘Safe’, Normal and Inhibit functions will be swapped.
2.3.2
DCI – Digital Mode
When the Digital Input setting is set to ‘Yes’, the DCI will limit the drive speed of the
chair to the value set in Reduced Speed. This will typically be implemented through
the use of an actuator-out-of-position switch.
Normal
Speed Limit
Inhibit
Speed Limit
Inhibit
Nominal DCI Loop Resistance ( ± 5%)
Resistance (
Ω
)
0 (>560)* 120
330
(120 + 330
(450 nominal)
>560 (0)*
* When Standard/Fail-safe is set to ‘Safe’, Normal and Inhibit functions will be swapped.
2.3.3
DCI Examples
Example 1
A powerchair has a seat raise
function and an On-board Battery
Charger (OBC).
The DX-GB will automatically limit the
speed to 60% when the seat is raised
(S1), and inhibit drive when the OBC is
plugged in.
When plugged in, an internal switch in
the OBC will activate causing an
open circuit (>560 ohms).
Digital Input
Yes
Standard/Fail-safe
Safe
Swivel Enable
Off
Ext. Speed Pot Min
25%
Enable DCI Speed Limit
Yes
Reduced Speed
60%
GBK64048
: Issue 1 – June 2007
16
