Thermal Arc Fabricator 140, Руководство по обслуживанию, Страница: 57 / 84

ADVANCED TROUBLESHOOTING FABRICATOR 140, 180
Janua r y 25, 2008 6-1 Manual 0-4992
SECTION 6:
ADVANCED TROUBLESHOOTING
6.01 Pre Power-Up Checks
1. Pe r fo r m Rectifie r Assembly Test P r ocedu r e section
6.11.
2. Pe r fo r m C1 & C2 Test P r ocedu r e Section 6.13.
3. Check the F1 fuse. Replace if open.
6.02 Initial Setup Conditions
This section is to help isolate the defective ci r cuit befo r e
t r oubleshooting, identify symptoms, and test the unit fo r
p r ope r ope r ation. Follow the inst r uctions as given to
identify the possible symptom(s) and the defective ci r cuit.
Afte r r epai r s a r e complete, r un the following tests again
to ve r ify that the unit is fully ope r ational.
A. Connect the gas supply to the r ea r of the Powe r Supply.
B. Adjust the inlet p r essu r e to app r oximately 20 CFH.
Refe r to page 3-4 "Adjusting Regulato r ".
C. Set the powe r supply cont r ols as follows:
1. VOLTAGE CONTROL SWITCH SW1 to Position 0.
2. WIRE SPEED CONTROL Potentiomete r to 0 (Fully
Counte r Clockwise).
3. Connect wo r k cable to negative (-) Pola r ity Change
Ove r te r minal.
4. Disconnect the wi r e f r om the Feed Head assembly
f r om the positive (+) Pola r ity Change Ove r
te r minal.
5. Open the PRESSURE ADJUST DEVICE so the wi r e
will not feed.
6. With the P r ima r y Line Disconnect in the OFF
position, plug the input powe r co r d into the
p r ima r y line outlet.
6.03 Primary Power Test
A. Close the P r ima r y Line Disconnect and obse r ve the
following:
1. Unit should r emain off, nothing happens.
B. Tu r n VOLTAGE CONTROL SWITCH to position 1 and
obse r ve the following:
1. G r een AC LED tu r ns on.
2. Fan tu r ns on.
3. OVERTEMP LED is off.
4. Output Voltage measu r es 0 VDC.
This completes the P r ima r y Powe r Test. If the above steps
we r e co rr ect, p r oceed to the next section, Logic and
Cont r ol Test. If the unit does not function as detailed
above, note the symptom and p r oceed to Section 6.08
P r ima r y Powe r P r oblems.
6.04 Logic & Control Test
A. Close the MIG gun switch.
1. Gas flows.
2. Feed r oll tu r ns slowly.
3. Output Voltage measu r es 21 VDC.
B. Release the MIG Gun Switch.
1. Gas flow stops.
2. Feed r oll stops tu r ning.
3. Output Voltage slowly dec r eases to 0 VDC.
C. Disconnect one of the wi r es connected to the
tempe r atu r e switch located on the r ectifie r heat sink:
1. Yellow OVERTEMP LED tu r ns on.
D. Close the MIG gun switch and obse r ve the following:
1. Gas does not flow.
2. Feed r oll does not tu r n.
3. Output Voltage measu r es 0 VDC.