Arc Machines 227 - Manual (Page 79)

MODEL 227
OPERATION MANUAL
Doc # 740063 Rev E
SECTION VII - CALIBRATION
7.6 SYSTEM FAULT CORRECTIONS
3. GAS - This fault will only occur at the beginning of or during a Weld
Sequence. If the arc Gas Flow through the system should stop or be too low a
fault will occur.
Check the Gas Source (user supplied) is turned on and that adequate gas is
available. Check all Gas Hoses and connections for free flow this is usually
the problem.
If there is no problem with the source or with hoses and connection then an
internal failure of the flow switch, solenoid or internal housing is possible.
Contact an AMI Service representative.
4. LVPS - The system continuously monitors its internal Low Voltage (DC) Power
Supplies. If they are not up to standard then the system may not be able to
perform to specification
There are several ways this could occur. The most common would be too low of
an AC input voltage. Check the line voltage to see that it is correct and that the
Power Supply is set up for that voltage (see section 3)
The other reason would be a failure of the LVPS. Always check the AC input
first and if that is OK call an AMI Seville representative.
5. COOL - Monitors the coolant flow out of the M227/207-CW or M207-CW
cooling unit. If it is not at least 0.2 GPM a fault will occur. This fault will only
exist if the CW unit is turned ON. IF it is off no fault will occur.
Check the hoses and flow path of coolant to and from the weld head this is usually
the problem. If all looks good then an internal failure of theCW pump or flow
switch is possible, contact an AMI Service Representative.
6. SENSOR 1, 2, 3 - These faults must be turned on and set up by the user. Contact
whoever set them up.
7. STUB OUT - This fault will only occur when an arc is present and will no longer
exist when the arc goes out. If the arc voltage gets to low or the electrode should
touch the weld puddle then a fault will occur. It creates an ALL STOP but does
not operate the “return to home” function after Postpurge.
The operator should check to see if the electrode is stuck to the tube being
welded. Clear the obstruction and jog the rotor to open position and remove the
tube and replace the electrode and then press the C key to clear the fault.
Check the required tungsten length and arc gap required for the weld. Something
caused the arcgap to get too small. This FAULT can be “turned OFF” by use of
the SET UP screens. It is recommended to turn it OFF when MANUALLY
welding.
7.9