Amada HF2, Руководство по эксплуатации

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CHAPTER 8: WELD MONITORING
2 KHZ INVERTER WEDLING POWER SUPPLY
8-2 990-057
Weld Current and Weld Voltage Measurements (Figure 8-2)
The measurements made by the Basic Weld
Monitor are derived by averaging the maximum
and mini-mum peak value of the weld current and
weld voltage. Figure 8-2 shows a
WELD 2
voltage
measurement example when the Power Supply is
using constant current feedback. The dotted line
represents the average peak reading.
For a truly independent audit of weld current and
weld voltage, use the optional Built-in Weld
Sentry Module with user flexibility on measuring
any part of a complex weld pulse profile. In
addition, the Built-in Weld Sentry can
simultaneously monitor up to five different
Figure 8-1. Average Peak Measurement.
measurement parameters, thus reducing the time to determine which measurement parameter is the best
indicator of weld quality changes. Refer to the
Built-in Weld Sentry User's Manual, Part No. 990-291 ,
for detailed information on this product.
Data Output Capabilities
Weld current, weld voltage, and the % control capacity for the
WELD1
and
WELD2
periods can be sent
from the Power Supply
RS-485 Serial Port
to a data collecting device such as a Host Computer. Weld
power and weld resistance are not transmitted but can be calculated by the Host Computer.
Weld Monitoring Suggestions
Use a Basic Weld Monitor measurement parameter that is different from the welding parameter that is
used to maintain the constant weld output pulse. For example, monitoring weld current when using
constant current feedback produces measurement readings that change very little and have no correlation
to changes in weld quality. A better choice in this case would be to monitor weld voltage, power, or
resistance.
The Dual Pulse welding function has two weld pulses,
WELD1
and
WELD2
.
WELD1
can be used to test the
misalignment of the electrodes to the parts and misalignment of the upper part to the lower part. If the
peak resistance reading made during the
WELD1
pulse is within user set limits, the
WELD2
pulse will
automatically complete the weld. If the
WELD1
resistance reading falls outside of the programmed limits,
WELD2
can be inhibited from firing, thus permitting the operator to re-position the parts to make the proper
weld. To make this measurement without affecting the actual weld, set WELD1 current, voltage, or power
to one-tenth or less of the
WELD2
pulse amplitude and the
WELD1
time to 3 msec. Make multiple good
and bad welds to establish a practical range for the Upper and Lower Limits. Program the Upper and
Lower Limit values, then turn on the
WELD1
inhibit option.