7
Adjustment Guide:
Positive Logic
Positive Logic
operation.
operation.
( Default setting )
( Default setting )
.
.
• Plug driver unit onto valve coil to be driven.
• Remove ‘DFC-3’ securing screw
• Remove ‘DFC-3’ opaque lid to reveal internal adjustments.
•
Ensure command PWM signal is set to zero.
• Ensure that all connections are correct and secure.
• Turn I Min potentiometer 1 turn Anti-Clockwise ( Minimum ).
• Turn I Max potentiometer 20 turns Clockwise ( Maximum ).
• Turn ‘Dither frequency’ potentiometer to approx. mid position.
• Apply 24VDC ( +18 - +32VDC absolute Maximum ) to the driver plug.
• Slowly increase command to approx 10% of maximum PWM.
• Use the I Min adjustment to give minimum motor speed required.
• Slowly Increase command signal to 100% of maximum setting.
• Adjust I Max until desired motor maximum speed is achieved.
• Check that ‘Output ON’ led is functioning proportionally by varying the
command signal.
• DFC-3 Plug top controller700-00027-0 is now set.
• Replace opaque lid carefully ensuring that seal is maintained.
• Replace securing screw and tighten
• Do not overtighten or lid damage is seen.
• Unit is now ready for continuous application use.
• Adjust Dither frequency to suit valve product being driven.
• Fully Anti-clockwise = approx. 100Hz
• Fully Clockwise = Approx.... 250Hz.
• Suggested setting is MID position.
• Set command to minimum PWM %
• Isolate plug from +24VDC supply.
700-00027-0, DFC-3 Plug Top Driver Unit.
Positive Logic operation
means that the output
current follows the input
command signal.
i.e. 0% PWM = Min O/P
100% PWM = Max O/P
This option is intended for
use when the input PWM
signal is conforming to
positive logic as above.
In this configuration, if the
power supply fails, the fan
unit will default to the
Maximum speed ( see note
below ).
For this option to be
activated, the user must
leave
link A fitted, the
location of which is shown
on page 4 of this manual.
NOTE:-
At all times during the set-
up procedure, it is
assumed that a reverse
acting pressure control
valve is being used.
For other logic or valve
types, please ensure the
input output logic is
correct before connection
and operation.
