Flowserve DFC17 - Manual (Page 9)

WCAIM2026 DataFlo Digital Electronic Controller DFC17 Installation, Operation and Maintenance Instructions 9
3.2 Input Signal Connections
NOTES: The Digital Controller setpoint input signal circuit is
protected by
1 /
16
amp fuse, F1 (See Figure 1 and Paragraph A of
Part 1.1).
A label on the circuit board indicates the controllers setpoint and
process signal configurations. See Section 5.2 for input signal
specifications.
After input signal connections have been made, securely tighten
all terminal screws. Keep wiring away from all rotating parts and
ensure it will not be pinched when the actuator cover is installed.
3.2.1 Milliamp
DFC17-1, DFC17-4, DFC17-10 (Milliamp Setpoint Input
Signal for Digital Controller)
For a milliamp setpoint signal input, the more positive or
“High” signal lead should connect to actuator terminal 11.
The less positive or “Common” lead should connect to
actuator terminal 10. [Terminal 10 is (), Terminal 11
is (+).]
The Controller is available for use with the following
signals: 1 to 5, 4 to 20, and 10 to 50 milliamps. The
Controller board is factory calibrated for one of the three
milliamp signal ranges and field changes are not advised.
Part 5.4 gives the nominal resistance load, which the
Controller presents to the control circuit for the three
signal ranges.
Comparison of resistance measurements made at
terminals 10 and 11 (on the yellow and blue wires from
the circuit board) against the resistances shown in Part
5.4 provides a quick way to determine the milliamp range
for which a particular board is calibrated. If fuse F1 is
blown, an open circuit will be indicated.
NOTE: If the circuit board has an orange wire (See
Figure 1) attached to it, the board is set up for a
Potentiometer Setpoint Input. See paragraph 3.2.2.
3.2.2 Resistive
DFC17-13, DFC17-1K (Potentiometer Setpoint Input for
Digital Controller)
NOTE: The Setpoint Input Potentiometer is not the
Feedback Potentiometer, but is an additional
Potentiometer provided with the Controller, and externally
located by the end user. The acceptable potentiometer
values are 135 ohm for the DFC17-13 board and 1000
ohms for the DFC17-1K board.
For a potentiometer setpoint input signal, the usual
connections will be as shown in Figures 2 through 5 with
a “Low” setpoint command being generated when the
potentiometer is rotated to its full CCW position and a
“High” setpoint command when it is in the full CW
position.
If the setpoint command signal is derived from other than
a rotary potentiometer, it is only necessary to keep in
mind that a “Low” (full CCW) setpoint signal is called for
when the command potentiometer presents the least
resistance between terminals 10 and 11 and the most
resistance between terminals 11 and 12. A “High” (full
CW) setpoint signal would be the reverse condition; the
least resistance between terminals 11 and 12 and the
most resistance between terminals 10 and 11.
If the “Setpoint Command” potentiometer is reasonably
linear, the setpoint will be approximately 50% when the
potentiometer shaft is halfway through its travel.
3.2.3 DC Voltage
DFC17-5V, DFC17-XV (Direct Voltage Setpoint Input
Signal for Digital Controller)
For a voltage setpoint input signal, the more positive or
“High” signal lead should connect to terminal 11. The less
positive or “Common” lead should connect to terminal
10. (Terminal 10 is (), Terminal 11 is (+).)
The Controller is available for use with the following direct
voltage setpoint input signals: 0 to 5 VDC and 0 to 10
VDC. The Controller board is factory calibrated for one of
these two signal ranges and field changes are not advised.
Part 5.4 gives the nominal resistance load which the
Controller presents to the control circuit for the two
signal ranges.
3.3 4–20 mA (4-75) Position Indicator Option Connections
For units with a 4–20 mA (4–75) position indicator option
installed (indicator board installed over limit switches) the red
and black wires from the position indicator board will have to be
spliced directly to the external positive and negative output
(meter) wires respectively.
Note: Before wiring, calibrate indicator board per the following
paragraph. All other wiring of option, including the dual
potentiometer, has been done at the factory.
To obtain proper 4–20 mA output, the indicator board output has
to be calibrated prior to wiring red and black wires. Using an
ammeter connected to the red and black wires of the indicator
board, adjust the two potentiometers R4 and R5 on the board.
With the actuator in the closed position (0%), adjust R5
potentiometer (adjacent to the number “4” etched on the circuit
board and closest to terminal block) to obtain 4 mA on the
ammeter. Move the actuator to the open position (100%) and
adjust R4 potentiometer (adjacent to the number “20” etched on
the circuit board) to obtain 20 mA. Because adjustment of one
potentiometer affects the other, repeat the procedure several
times to obtain proper values.
NOTE: If a dual pot option only is installed, the “B” pot leads will
have to be wired directly to external device. The “A” pot leads
are factory connected to the terminal Block (TB1) on the Digital
Controller Board. Also, note that the “B” potentiometer has a
voltage limit of 30 volts maximum.
Flow Control Division
Worcester Actuation Systems