High Country Tek DRF Series - Manual (Page 22)

021-DRF Rev A DRF User Manual 22
Copyright © High Country Tek, Inc. – 2013
DRF
Closed-loop Valve Controller
Closed Loop Velocity Mode (DRF2-Vxx)
The DRF can drive a single solenoid valve in closed
loop velocity mode.
Set the input ranges to match the desired command
and feedback range.
NOTE: The feedback (C2 input) setting should be
inverted for reverse-logic valves. The minimum must
be greater than the maximum.
Set the dither and output settings according to the
valve specifications.
Schematic:
FUSE
+V Power Input
9 - 32VDC
+V = Enabled
PWR J1-1
DRF2
Electronic Valve
Controller
Enable J1-3
GND J1-2
-10V Ref. Out J4-1
+10VDC @ 20mA
0 to 10VDC
+10V Ref. Out J4-3
Ch. 1 I/P J5-1
Sig GND J4-2
J5-2
V
D
C
I/
P
m
A
I/
P
Supply Voltage
4-20mA
Ch. 2 I/P J5-3
Prop. PWM (Sourcing)
Sig GND J2-2
Ch. 1 Out J2-1
Ch. 2 Out J2-3
Prop. PWM (Sourcing)
Feedback
Process
Example Settings
Command/Feedback Transfer Diagram
Parameter Value
C1 Mode 4 VEL USE ENBL
C1 Min input 0.2 V
C1 Max input 10.0 V
C1 Min output 5 mA
C1 Max output 600 mA
C2 Mode 2 IN2 USE ENBL
C2 Min input 0.2 V
C2 Max input 10.0 V
C2 Min output 5 mA
C2 Max output 600 mA
Dither frequency 150 Hz.
Command (C1)
Feedback (C2)
+10V -10V 0.2V
0.2V
+10V