Each of the 99 steps between corresponds to 100Ohm. As an example, if the input is connected to 0V via a 4.7KOhm resistor,
then the input is considered to be at 47%.
Dependent on the state of an input, it is in one of four bands. The size of these bands is programmable via the parameters
Lower Level Threshold, Middle Level Threshold and Upper Level Threshold. These are shown in the following diagram.
Each of the Threshold Level parameters can be set between 0% and 100% in steps of 1%.
After the input bands have been defined, then each input can be linked to a speed limit or full drive inhibit via the parameters:
Assign, Speed Limit in Band 0, Speed Limit in Band 1, Speed Limit in Band 2 and Speed Limit in Band 3.
Assign, Speed Limit in Bands 0, 1, 2 and 3 as Operation.
Each input can also be linked to an actuator function via the parameters: Assign, Channel x Up: Inhibit in Bands and Channel x
Down: Inhibit in Bands.
SPEED INHIBIT EXAMPLE
Application: A wheelchair with an elevating seat, whereby, when the seat is lowered, full speed drive is permitted. Then as the
seat raises, 3 switches are operated, thereby changing the resistance connected to the input and giving, say, 50% speed limit to
25% speed limit to full drive inhibit.
In this example the Inhibit is connected to Inhibit 18 input that is sited on the ISM-8.
A circuit such as follows is used.
The Inhibit input must be assigned to a specific software Inhibit. As this is a speed inhibit, the parameter Drive Inhibi ts Assign
should be used. Inhibit 18 input is therefore assigned to Drive Inhibit A.
When the seat is in the fully lowered position, all switches are closed and the electrical resistance is a short-circuit or 0 Ohms.
As the seat raises, SW1 opens giving 2.2KOhms, then SW2 opens giving 4.4KOhms and at full height SW3 opens giving a
complete open-circuit
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