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Software supporting the MFDC displays data on the Weld Data screen
on the DEP-100S (Hand-Held Terminal) differently from that for AC
welding controls. This section describes the differences in the
Weld
Data
screen:
max
avg
low
These three rows indicate the maximum, average and
minimum values read during the last weld.
busV
This value is the INVERTER DC BUS voltage. The low
can typically be as much as 100 VDC below the average.
For diagnostic purposes, the AVG should be monitored.
If average voltage keeps decreasing over time, this could
point to the capacitors degrading and wearing out.
secI
This value represents the secondary current the inverter
is firing. This value can be very low, as it indicates the
current being delivered during the first MFDC half-
cycle. It is during this half-cycle that the inductance of
the transformer is overcome.
If setting the FIRING MODE: to (PRI CURRENT) or
FIRING MODE: to (PRI VOLTAGE) in the setup
parameters, the secondary current shown will be the
primary current multiplied by the turns ratio set in the
XFMR Turns Ratio setup parameter.
If setting the FIRING MODE: to (SEC CURRENT) in
this setup parameter, the secondary current shown will be
the actual secondary current read from the secondary
current sensor.
priI
This shows the primary current the inverter is firing. This
value can be very low, as it indicates the current being
delivered during the first MFDC half-cycle. During this
half-cycle, the inductance of the transformer is
overcome.
Regardless of the setting in the Firing Mode setup
parameter, the primary current shown will be the actual
primary current read from the primary current sensor.
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