Curtis 1238E - Page 116

112
Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE Manual, os 30
24 NOVEMBER 2015
8 — VCL
e 0–100% position of the potentiometer is represented by a value from
0–32767 in VCL, and is set up through the VCL Setup_Pot() function. 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 eect of setting the rottle Type = 5 is that the signal chain
for the throttle now gets its input from a dierent source. e input to the
throttle chain is now a VCL variable called VCL_rottle instead of the throttle
pot. Similarly, Brake Type = 5 means the brake signal chain will get its input
from a VCL variable called VCL_Brake rather than from the brake pot. e
VCL_rottle and VCL_Brake 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
running in the motor controller OS. e 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. is function
also forces the pot value to a definable level if a fault occurs. Note that the Set-
up_Pot_Faults() function will work for all throttle Types (1–5). See page 131
for more detail on this function.
Analog Inputs
ese controllers have two generic analog inputs (pins 24 and 8). ese are
shared as switch inputs 1 and 2 (Sw_1, Sw_2). e 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.
e ltered 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. e default lter value is 328 (10 Hz) and can be
changed in VCL by changing the Analog1_Filter and Analog2_Filter values.
Scaling is 0–999 Hz = 0–32767.
Analog Output
e 1234E/36E/38E and 1234SE/36SE controllers have one analog output
(pin30); the 1232E/SE has no analog output. is output is a special driver
output. e switching stage is filtered to provide a smooth average voltage, in-
stead of the actual PWM waveform seen on Drivers 1–5. However, AnalogOut