Tweco HMC-410 - Manual (Page 30)

HMC-410
2-12 July 27, 2005
Art # A-04360
Figure 2-4: Fixture Electrical Interface
Pin A (Purge Input) —If connected to Pin H, the control
panel will allow the flow of gas without running wire.
Pin B (Inch Input) — If connected to Pin H, the control
panel will feed wire (without the flow of gas) at a speed
programmed into the Run In section of the weld cycle;
the welding wire WILL NOT be electrically “hot.”
Pin E (Sub Segment Advance Input) — Connecting
(momentarily or permanently) to Pin H will advance the
control panel to the next programmed weld sub segment
(i.e. 1 to 2, 2 to 3, 3 to 4, and 4 to 1). However, if
permanently connecting Pin E to Pin H, the connection
will have to be momentarily opened and then closed again
for another sub segment advance. Refer to the Operation
- Auxiliary Interface Operation or Semiautomatic
Operation section of this manual for specific details on
setup and operation of the sub segment feature.
Pin F (Start/Stop Input)— To start the weld cycle, connect
to Pin H. The control panel will then cycle from preflow to
weld. To stop the weld cycle, disconnect from Pin H. The
control panel will then leave weld and cycle from crater
fill to ready.
Pin H (Common) — This pin serves as the common for
pins A, B, E, and F.
Pins M and N (Relay 2) — This relay is normally open.
When the control is in the recycle segment in between
spot welds or at end of continuous weld, the relay will
close (between pins M and N).
Pins P and R (Error Relay)—This relay is normally open.
When the control detects a tolerance or ground fault, the
relay will close (between pins P and R). The relay will
remain closed for the duration of the weld in which the
fault occurred, and .1 second into Ready. This relay can
be used to drive another relay to latch the occurrence of
an error. A tolerance fault can be one of: arc voltage out
of tolerance, wire feed speed out of tolerance, or loss of
arc established. The tolerance fault is reset when a new
weld is initiated.
Pins T and S (Relay 1) — This relay is normally open.
When the control is in the weld segment, the relay will
close (shorting pins T and S). This relay is used for an
arc on condition.