Arc Machines 207 - Manual (Page 65)

MODEL 207A AND 207A-1
OPERATION MANUAL
Doc. No. 740044
Rev F
SECTION VII - CALIBRATION
7.4 SYSTEM FAULT CORRECTIONS
When a System Fault occurs prior to or during welding it is required for the
operator to clear the fault condition before welding. When a fault occurs during
sequence or attempting sequence the FAULT SCREEN will appear.
Some faults are only temporary and the fault is corrected when the arc goes out.
But all faults will cause the FAULT SCREEN to appear and let the operator know
why the sequence was stopped.
The following is a general description of the cause of each type of fault and some
recommendation for correction. In all cases, when the fault is corrected the
operator must press the C key to clear the FAULT SCREEN. If the fault is truly
corrected the system will automatically return to the weld schedule it was on when
the fault occurred.
1. TEMP - The M-207A has internal temperature sensors (thermal switches). If
the Power Supply internal temperature rises above safe limits a TEMP fault
occurs. This can only occur if there is some type of blockage of air
circulation, fan failure or component failure within the Power Supply OR THE
SYSTEM IS BEING OPERATED IN AN AMBIENT AIR TEMPERATURE
BEYOND ITS RATED 110 DEGREES F.
This Fault should only occur during an actual weld sequence. If it occurs
when the machine is not welding then a serious internal problem exists. In
this case turn the Power Supply OFF and call an AMI Service representative.
If it occurs during welding, check for blockage of the air intakes on the side of
the machine and for cleanliness of the filters. They may need cleaning. If no
blockage exists and the filters are clean then cease all welding operations and
call an AMI Service representative.
2. INPUTAC - Monitors the available line current. If the system cannot supply
the desired DC amperage of the weld schedule it looks to see if the line
voltage is adequate for that amount of current.
This fault could occur if a weld schedule is asking for 110 amperes or more
and the M-207A is being operated on 120 VAC. The M-207A can only
supply over 100 amperes when operated on 200 VAC or higher.
7.6