Rockwell Automation Liqui-Flo AC GP Vector Drive Version 6.4 - Manual (Page 203)

Using the Terminal Strip Analog Input F-1
A
PPENDIX
F
Using the Terminal Strip Analog Input
An analog reference input is provided at terminals 12 through 15 on the drive’s
Regulator board. This input accepts either a +/-10 VDC or 0 to 20 mA signal. The
analog-to-digital conversion provides 10-bit plus sign resolution and a digital range of
+/-1023.
The analog input can be used as a reference for:
• Speed reference (P.000, P.007/P.008)
• Trim reference (P.014)
• Torque reference (vector control only) (U.000)
• Outer control loop feedback (U.040)
Parameters P.009 (Terminal Strip Analog Input Offset) and P.010 (Terminal Strip
Analog Input Gain) are used to adjust the converted value for any external signal
errors. Parameter P.011 (Terminal Strip Analog Input Configure) is used to specify the
type of signal used and to invert the converted value, if required.
Three quantities are calculated from the analog input value: scaled, speed
normalized, and torque reference. The scaled value is used for the outer control loop
(OCL). The speed normalized value is used for either speed or trim reference. The
torque reference value is used for torque reference for vector control. Figure F.1
shows the relationship between the input and the calculated values:
Figure F.1 – Terminal Strip Analog Input
Analog Input Scaled
4095 @ 10V (20 mA)
Analog Input
(+/- 1023)
G
G
Analog Input Torque
Reference
150% iq @ 10V (20 mA)
+
+
+
+
P.009
P.003
P.010
P.004
P.011
Analog Input
Normalized to Speed
P.004 @ 10V (20 mA)
x4
x4