Create And Memorize New Automatic Welding Spots; Call Up Automatic Spots Memorized Beforehand - CEA DIGISTAR 250 DUAL PULSED Manual De Instrucciones

Special functions
Just press the SPECIAL FUNCTIONS key to enter these param-
eters. A brief description of parameters that could be changed
follows and all the eventual combinations to be had are summed
up in table 5 (easily legible).
1) STARTING SPEED — Adjusts the starting speed of wire to
the piece. The given value is a variation in percentage against
the values set in the factory (StS - from -30% to +100% with
a 1% interval for adjustment);
2) BURN BACK — Adjusts the length of the wire coming out of
the gas nozzle after welding. The given value is a variation in
percentage against the values set in the factory. A higher num-
ber corresponds to greater wire burn back (bub - from -20%
to +20% with a 1% interval for adjustment);
3) PRE GAS — Supplies a quantity of extra gas, for a given time
set in the factory, before starting to weld (PrG - from 0 to 2
seconds with a 0.1 seconds interval for adjustment);
4) POST GAS — Supplies a quantity of extra gas, for a given
time set in the factory, before finishing welding (POG - from 0
to 10 seconds with a 0.1 seconds interval for adjustment);
5) CRATER START CURRENT — This is the current used to
start welding (CRATER welding mode connected) and may
be adjusted from - 50% to + 99% of the welding current (CSC
- from - 50% to + 99% with a 1% interval for adjustment);
6) INITIAL CURRENT TIME – Time during which the current
remains at the initial crater value (active only in 2T CRATER
mode) (SCt - from 0 to 5 sec with an adjustment interval of
0.1 seconds);
7) CRATER END CURRENT — This is the current at the end of
welding (CRATER welding mode connected) and may be ad-
justed from - 99% to + 50% of the welding current (CEC -
from - 99% to + 50% with a 1% interval for adjustment);
8) FINAL CURRENT TIME – Time during which the current re-
mains at the final crater value (active only in 2T CRATER mode)
(ECt - from 0 to 5 sec with an adjustment interval of 0.1 sec-
onds);
9) SLOPE — Slope of current to pass from the "initial crater
current" level to the welding current level and to go from the
latter to the "final crater current" level. (SLO - from 10 A/s to
500 A/s with a 5 A/s interval for adjustment);
10) DOUBLE PULSE CURRENT — Determines the percentage
value of the peak and base current of the double pulse. The
value indicated is a percentage variation in + or – compared
to the value of the average welding current set (dPC – from 0
to +100% with a regulation interval of 1%).
EXAMPLE: Average pulsed current = 120 A - Double pulse
current = 180 A – Base current = 60A when the double pulse
current is set at position 50.
11) DUAL IMPULSE FREQUENCY — Establishes the dual im-
pulse frequency (Fdp - from 0.5 to 5 Hz with a 0.1 Hz interval
for adjustment);
SIZE
STARTING SPEED
BURN BACK
PRE GAS
POST GAS
CRATER START CURRENT
INITIAL CURRENT TIME
CRATER END CURRENT
FINAL CURRENT TIME
SLOPE
DELTA PULSE CURRENT
DUAL IMPULSE FREQUENCY
SPOT WELD TIME
AUTOMATIC CURRENT SLOPE
WELDING PROCESS
WORDING
MIG/MAG
PULSED
StS
bub
PrG
POG
CSC
SCt
CEC
ECt
SLO
dPC
FdP
SPt
ACS
32
12) SPOT WELD TIME — Time needed for spot-welding (after
pressing the torch key) after which the arc automatically
switches off (SPt - from 1 to 20 seconds with a 0.1 seconds
interval for adjustment).
13) AUTOMATIC CURRENT SLOPE — Slope of the current when
passing from one level to another; useful when employing
welding sequences (ACS – from 5A/s to 500A/s with interval
regulation of 5A/s). It also determines the variation speed of
the welding current following regulation by the operator.
Table 5 sums up the special programmes available in the various
welding modes and processes.
Create and memorize new automatic
welding spots
After establishing a new welding spot (see paragraph "AUTO-
MATIC welding procedure") proceed as follows:
• Press the RUN/MEM key (AUT led on) until the first welding
spot free and/or available starts flashing on the PROGRAMME
DISPLAY (dVP);
• Press the RUN/MEM button until "Sto" appears on the dVP
display and then release the button;
• After completing the saving operation the programme will set
itself automatically on the saved welding spot.
NOTE: The creation of an automatic welding point implies the
memorisation of all the corresponding special functions.
Call up automatic spots memorized
beforehand
The AUTOMATIC welding procedure must be entered to back-
track previously memorized automatic jobs, then the
PROGRAMME SCROLLING keys must be pressed to select and
view the memorized automatic jobs.
MIG
MIG
DUAL 2T/4T
PULSED
Table 5
WELDING MODE
2T
SPOT WELD
CRATER CRATER
4T