Flowserve DFP17 - Manual (Page 8)

8 DataFlo Digital Electronic Positioner DFP17 Installation, Operation and Maintenance Instructions WCAIM2037
2.0 DataFlo ELECTRONIC POSITIONER
CIRCUIT BOARD
2.1 General
Figure 2 defines the location of major components and wires from the
Positioner Board to terminal strip connections. The Digital Positioner
Board is factory wired to the terminal strip either per Figure 4, Figure
5, Figure 6 or Figure 7, as found in Section 3.0, depending on power
circuit voltage and if 4–20mA position output option is installed.
The feedback potentiometer leads are factory connected to the
terminal block (TB1) on the Digital Positioner Board.
If a dual pot option 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 Positioner Board. Also, note
that the “B” pot has a voltage limit of 30 volts maximum.
2.2 Circuit Board Configurations
The positioner board is factory supplied for one of the seven input
signal options plus a two-wire RS-485 interface.
NOTE: Field changes to the positioner board are not advised. Consult
Flowserve before attempting any modification.
2.3 LED Indicators
Light emitting diodes (LEDs) marked LD1 (CW) and LD2 (CCW) are in
the output circuits and, when lit, indicate which direction the actuator
is trying to drive. A third LED, LD3, is used to indicate when an alarm
condition exists. If LD3 is lit, the alarm that caused it to light must be
determined by looking at the Liquid Crystal Display (LCD) and finding
the alarm parameter with the UP or DN switch.
2.4 Controls (Override)
There are no adjustable controls provided on the circuit board,
because none are necessary. All parameters are set through the
programming switches (keys) or the RS485 interface. Local push-
button control is provided at the actuator by simultaneously pressing
the SEL and UP switches (keys) for three seconds. At this point the
UP and the DN switches (keys) can be used to manually position the
actuator shaft. Pressing the SEL switch for three seconds will return
the positioner to the run mode.
2.5 AC Power Control
The AC output circuits are controlled by solid state switches (triacs
Q3, Q4), which will provide trouble-free operation for the life of the
equipment they are used with, AS LONG AS THEY ARE OPERATED
WITHIN THEIR RATINGS.
The ratings for the solid state switches used in the Worcester/
McCANNA DataFlo Digital Electronic Positioner are listed in
Section 5.3.
3.0 WIRING OF DIGITAL POSITIONER
AND SERIES 75 ELECTRIC
ACTUATOR
See wiring diagrams located under actuator cover and/or in Figures 4
through 7 for customer connections.
3.1 Actuator Power
a CAUTION: Wiring should be inserted only to midpoint of terminal
strip.
3.1.1 Wire Size
Power to the positioner and from the positioner to the
actuator should be with wire no smaller than 18 gauge
and with insulation rated for the particular application.
The 18 gauge wire size is sufficient for all Worcester/
McCANNA Series 75 actuators. When using the
Positioner with other makes of actuators, check the
manufacturer’s current rating to determine the correct
wire size.
3.1.2 Termination and Voltage
Power connections are made to terminals 1 and 2 of the
terminal strip. The AC neutral or common, or DC negative
wire should be connected to terminal #1 and the AC
“hot” or DC positive wire to terminal #2. Note that the AC
Positioner requires a minimum of 110 VAC, and a
maximum of 130 VAC for the 120 VAC version and a 220
VAC minimum, 250 VAC maximum for the 240 VAC
version.
Grounding wires should be connected to green colored
grounding screw (if present) on the actuator base or to
any base plate mounting screw in the actuator.
3.1.3 Minimum Fuse Ratings
See table below for minimum fuse rating when over
current protection is used in motor power circuit.
Minimum Fuse Rating for Over Current Protection
Actuator Size Voltage Fuse Rating
10-23 120 VAC 5 A
25/30 120 VAC 10 A
10-23 240 VAC 3 A
25/30 240 VAC 5 A
10-23 24 VDC 5 A
NOTE: This table shows the minimum rating to prevent
inrush current from blowing the fuse.
Flow Control
Worcester Actuation Systems