Tweco Weld Sequencer - Manual (Page 36)

Section Name 30 Manual 0-2023
Subsection 5.04 includes specific test procedures, as ref-
erenced by the troubleshooting guide, for any specific
test(s) to be performed.
B. How to Use the Troubleshooting Guide
The following information is a guide to help the Service
Technician determine the most likely causes for various
symptoms. This guide is set up in the following manner:
1. Perform operational check(s) on the equipment to iso-
late problem to possible circuit(s).
2. Determine symptom and isolate to defective assembly
using the following format:
System normal operational sequence and condition(s)
X. Symptom (Bold Type)
Any Special Instructions (Text Type)
1. Cause (Italic Type)
a. Check/Remedy (Text Type)
3. Locate your symptom in the appropriate.
4. Check the causes (easiest listed first) for the symptom.
5. Check the remedies listed for each cause.
6. Repair as needed being sure to verify that unit is fully
operational after any repairs.
NOTES
While troubleshooting visually inspect the inter-
nal components for signs of overheating, fractures
and damage.
With all components of the welding system ready for
operation, move the Weld Sequencer Enclosure ON/OFF
switch to the ON position. The red AC POWER light
comes ON.
A. No red AC POWER light
1. No input power
a. Check input power connections and fuses
2. Fuse 1FU blown
a. Check and replace
3. ON/OFF switch faulty
a. Check and replace
4. AC POWER light
a. Replace
B. Cannot set desired plasma gas flow rate (GS1 in
use)
1. GS1 not turned on
a. Turn on
2. Gas supply not turned on
a. Turn on
3. GS1 set in AUTO using current slope
a. Switch to manual, adjust flow rates and switch
to AUTO sequence
4. Plasma gas metering valve in Welding Console not com-
pletely opened
a. Open valve completely
5. Incorrect gas supply pressure to console
a. Reset or replace regulator, check for gas leaks
6. Faulty GS1 PC board
a. Replace
7. GS1 motor/valve assembly out of calibration
a. Recalibrate, refer to Section 5.05-F
8. Blockage in hoses, console, or torch, restricting flow
a. Locate and repair
If CS1 is not on when the RP1 CONTACTOR switch is
moved to “ON” the power supply contactor closes and
the welding arc should transfer. If CS1 is used then the
welding arc is established when RP1 START SE-
QUENCE is pressed.
C. No welding arc transfer:
CS1 and WT1 not used, RP1 only used
1. CC Relay faulty or missing
a. Check and replace
2. RP1 contactor switch faulty
a. Check and replace
WT1 and RP1 used
3. WT1 faulty
a. Turn WT1 off, if arc transfers replace WT1 PC
Board. If not, refer to Section 5.04-B
CS1 and RP1 used
4. RP1 contactor switch not on before start sequence is
pressed
a. Switch to ON