Tweco Weld Sequencer - Manual (Page 38)

Section Name 32 Manual 0-2023
6. Faulty GS1 PC Board
a. Replace
H. Torch tip blows during upslope sequence
1. Current slope too fast or gas slope too slow to maintain
proper arc characteristics
a. Check CS1 (refer to Section 4.06) and GS1 (refer
to Section 4.08) for proper adjustment
2. Gas leaks in system
a. Check and correct
3. Incorrect gas flow
a. Adjust
I. Welding arc cuts instead of maintaining keyhole
1. Current or gas flow too high to maintain proper keyhole
a. Adjust properly
J. Current doesn’t reach proper peak level (also see
Symptom 'D')
1. RP1 Weld Current set too low
a. Adjust RP1 to desired peak current
K. Plasma gas flow doesn’t reach desired maximum
rate
1. Plasma gas control valve in welding console not opened
all the way
a. Open valve completely
2. Plasma gas pressure incorrect
a. Adjust pressure check for leaks replace regula-
tor
3. Faulty GS1 PC Board
a. Replace
4. GS1 Motor/Valve Assembly out of calibration
a. Recalibrate (refer to Section 5.05-F)
As the weld time set on WT1 times out, the start of CS1
and GS1 downslope is signaled. The AL relay is also
energized.
L. Current does not start to decrease
1. CS1 set for delay of downslope
a. Check CS1 DOWNSLOPE DELAY setting
2. WT1 not ON
a. Turn WT1 to ON
3. WT1 timer faulty
a. Check and replace
4. CS1 PC Board faulty
a. Replace
M. Gas flow does not start to decrease
1. GS1 set for delay of downslope
a. Check GS1 DOWNSLOPE DELAY setting
2. GS1 PC Board faulty
a. Replace
N. GS1 or CS1 downslope not delayed when set for
delay
1. DOWNSLOPE DELAY circuit faulty
a. Replace PC Board in faulty module GS1 or CS1
At the end of the downslope sequence the current is at
the CS1 FINAL CURRENT set level and the gas flow at
the GS1 MIN flow setting. The CS1 FINAL TIME starts
timing. If keyhole welding the keyhole should be
closed at this point.
O. Keyhole weld not closing
1. MIN gas flow too high
a. Reduce flow rated
P. Current doesn’t reach final current level or goes
lower
1. CS1 FINAL CURRENT at wrong setting
a. Check and adjust
2. Faulty CS1 PC board
a. Replace
Q. Minimum gas flow too high or too low
1. GS1 MIN flow at a wrong setting
a. Check and adjust
2. Gas pressure incorrect
a. Reset or replace regulator or check for leaks
3. GS1 PC Board faulty
a. Replace
4. GS1 Motor/Valve Assembly out of calibration
a. Recalibrate (refer to Section 5.05-F
5. Blockage in hoses, console or torch restricting flow
a. Find and repair