Tweco 400 Ultra-Cut(May 2014) - Manual (Page 192)

ULTRA-CUT 100 XT/200 XT/300 XT/400 XT
A-64 APPENDIX Manual 0-5302
Art # 12309
2
1
3
SW11
TP9
TP1 GND
0-3.3VDC
GND
Divide
by 3.
From Remote
analog Current
Control
CCM
1
2
3
4
5
6
7
8
9
10
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12
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16
J26
GND
+10.0V R1
10K
1
2
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16
J55
1
2
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J56
GCM 1000 XT
(125)
(126)
(127)
Auto-Cut XT Power Supply
(AC 300 XT)
R1
10K
AC 200 XT
105 Not Used. This is one of the reserved codes from the earlier product.
106 Pilot Timeout, no Transfer
Pilot time is limited to either 0.085 seconds (85 ms.) with CCM SW8-1 off (default for pierce starting) or 3 seconds with
SW8-1 on (used for cutting over holes, expanded metal, etc.). Arc must transfer before pilot time ends. Code 106 is set
if no arc transfer (current in work lead) was sensed before pilot timed out. If the unit does not detect pilot current the arc
starter will operate up to 15 seconds then set the 102 code. If you are getting 106 there is pilot current somewhere. If it’s
not visible perhaps it’s inside the consumables or following some other part.
Causes for 106 code:
No Pilot Visible:
• Pilot inside the consumables
Visible Pilot:
• First the obvious, make sure the work lead is connected both to the work and the power supply. Also make sure the
work itself is making good electrical contact with cutting table. If rusty or painted metal, you may need to clean a spot
and attach the work lead directly to the metal.
• Torch too far from work.
• Cut current set too low for torch parts being used. Pilot current is set based on cut current. If cut current is too low
pilot current will be lower and may not transfer at the height used for higher current consumables.
• Preflow pressure/flow too low.
• Remote Analog Current Control switches set wrong can also result in lower than normal pilot current setting. See
section on these switch settings under section for code 104.
• Defective work lead current sensor circuit. If transfer is not sensed cut current remains at the lower starting level and
pilot timer (85 ms. or 3 sec) will time out.
107 Not Used. This is one of the reserved codes from the earlier product.
108 Tip to Electrode Voltage Fault
The Pilot voltage, measured between tip and electrode varies with different current and gas type, flow rate and consumable
design.
Once the arc is transferred the pilot switch opens leaving the tip basically floating. The voltage then is determined by how
much of a cold gas barrier surrounds the arc. Too much current or too little gas and the arc starts to contact the tip reducing
the voltage difference between tip and electrode and leading to a double arc that destroys the consumables.
The CCM measures both electrode and tip voltage and calculates the difference. If the difference between tip and electrode is
found to be less than a minimum voltage we stop cutting and set a fault for the 108 code. The normal tip to electrode voltage
is different for different processes so the min value for each process is embedded in the cut charts when using the DFC 3000
or in the CCM code if using the GCM 2010 or for Auto-Cut XT gas controls (GCM 1000XT or the built in one in the AC 200 XT).