Curtis 1298 Manual, OS 11
91
7 — VCL
Note that the Setup_Pot() function will only work (and is only needed) if the
corresponding Type is set to 5 (Throttle Type = 5 or Hyd Throttle Type = 5).
Setup_Pot(THROTTLE_POT,THREE_WIRE)
will set up the throttle pot input for wiring using all three connections (pins
15, 16, 18).
To set up the hydraulic throttle pot input for use in VCL, use the Brake_Pot
constant in place of the Thottle_Pot constant in the Setup_Pot function.
Setup_Pot(BRAKE_POT,TWO_WIRE)
will set up the hydraulic throttle pot input for wiring using two connections
(pins 17, 18).
The 0–100% position of the potentiometer is represented by a value from
0–32767 in VCL. Once set up (through the VCL Setup_Pot() function) the
potentiometer value is automatically and continuously loaded into the variable
Throttle_Pot_Output or Brake_Pot_Output. It is important to use the correct
setup (ONE_WIRE, TWO_WIRE, or THREE_WIRE) since the input is automatically
re-scaled for 0–100% based on the wiring used; for example, the voltage at the
Pot Low pin is automatically subtracted and re-scaled on a
THREE_WIRE pot.
Another effect of setting Throttle Type = 5 is that the signal chain for the
throttle now gets its input from a different source. The input to the throttle
chain is now a VCL variable called VCL_Throttle instead of the throttle pot.
Similarly, Hyd Throttle Type = 5 means that the hydraulic throttle signal chain
will get its input from a VCL variable called VCL_Hyd_Throttle rather than
from the hydraulic throttle pot. The VCL_Throttle and VCL_Hyd_Throttle
variables will need to be controlled in the VCL program.
One of the unique features of the potentiometer inputs (as opposed to the
analog inputs) is that they have automatic pot fault detection functions run-
ning in the motor controller OS. The VCL programmer has access to the pot
detection functions with the Setup_Pot_Faults() function. With this function,
VCL can set the high and low threshold at which a fault occurs. This function
also forces the pot value to a definable level if a fault occurs. Note that the
Setup_Pot_Faults() function will work for all throttle Types (1–5). See page 111
for more detail on this function.
Analog Inputs
These controllers have two generic analog inputs (pins 24 and 8). These are
shared as switch inputs 1 and 2 (Sw_1, Sw_2). The values of the analog inputs
are automatically placed in VCL variables Analog1_Input and Analog2_Input
every 1 millisecond. Scaling is 0–10V = 0–1023.
User2 = Analog2_Input
will fill the User2 RAM variable with the value of the voltage at pin 8.
The filtered values of the analog inputs are also available and are auto-
matically placed in VCL variables Analog1_Filtered and Analog2_Filtered.
Scaling is 0–10V = 0–1023. The default filter value is 328 (10 Hz) and can be
changed in VCL by changing the Analog1_Filter and Analog2_Filter values.
Scaling is 0–999Hz = 0–32767.
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