Miller Electric DWF3 - Manual (Page 19)

SECTION 3 OPERATION
OM-179 078 3-3
indicated on the digital display; set the SPEED CONTROL selector switch to the STANDARD position.
Positioning the MANUAL START/REMOTE START switch to the MANUAL START position will now initiate a
wire feed cycle.
The digital display will blink during START DELAY time. At the end of START DELAY, wire will begin to feed
and the speed will be indicated on the display. Re–setting the MANUAL START switch to OFF will initiate the
end of a wire feed cycle for the DWF–3. After STOP DELAY times out, the motor on the wire drive unit will
reverse and retract the filler wire from the weld puddle; after the retract time, wire will stop feeding and the
cycle is complete.
3.4 REMOTE SIGNALS
The DWF–3 control unit has the capability of being controlled from a remote location. Seven signals are
available as described in Table 2.2 as well as the following paragraphs.
Electrical connections are made as shown in Figures 3.3, 3.4 and 3.5. A prewired connector and cable is
available from the factory (P/N 179 167) .
REMOTE START is implemented by applying a signal between pin C and F. Pin C is the positive terminal and
pin F is the negative terminal. This signal should be 5–24 VDC. The cycle will remain active as long as the
signal is applied. The cycle terminates when the signal is removed.
The INHIBIT FUNCTION is implemented by applying a signal to pins E and G; pin E is positive and pin G is
negative. This signal should be 5–24 VDC. When the inhibit signal is applied, the wire feed is interrupted, but
the cycle is not affected at its point in the cycle. When the inhibit signal is removed, the wire feed will continue.
This feature is helpful for manual override or a pulse synchronization of wire to a pulsing power source.
REMOTE JOG FORWARD/REVERSE is implemented by the use of a SPDT switch. The center pole is
connected to pin D. The forward pole is connected to pin L and the reverse pole is connected to pin K. This
switch is now wired in parallel with the Jog switch on the front panel, and functions in the same manner.
REMOTE WIRE SPEED control is implemented in much the same way. A 10K 1/2W potentiometer is
connected with its wiper (center pole) on pin N. The plus reference voltage pole is connected to pin M and the
minus or ground pole is connected to pin A. This pot is now selected by switching the speed control switch on
the front panel (lower right corner of wire speed area) to the REMOTE position. Wire speed is now determined
by setting this pot. The wire speed may also be controlled by a 0 to 1.235 volt signal (pin N to pin A which
corresponds to 0 to 300 inch per minute wire speed).
REMOTE START DELAY signal is an output that signals when the system is in the DELAY timing mode. When
the START DELAY times out, the signal is removed. This signal is 24 VDC 500 mA max current. It may be
used to light a remote indicator lamp or energize a relay coil. The signal connects to pin I of the remote
connector; return is ground (pin D).
REMOTE AUTO FEED signal is an output that signals when the system is feeding wire automatically at the
selected rate. Its output characteristics are the same as the remote start delay signal. The signal is on pin J at
the remote connector; return is ground (pin D).
MOTOR PULSE signal is an output that signals each step of the feed motor. This signal is a 24V, 18 sec wide
pulse with a 10K source resistance. It may be used for a tachometer output of wire length output. Each pulse
represents 0.0116 inches of wire feed. The signal is on pin H; return is ground (pin D).