Tweco HMC-410 Robotic Interface Kit - Manual (Page 24)

This mode effectively has the HMC-410 run as the master weld control. The robot controls the welder with a
master Weld On/Off control. The HMC-410 can control the welding parameters of wire feed speed and arc
voltage / pulse frequency for the whole weld, or for some parts of the weld. For example, the HMC-410
could control the run-in speed and voltage, a 1/2 second start level, then use the settings from the robot for
the ‘main weld’. Once the master weld signal transitions to the off setting, the HMC-410 could then control
the craterfill setting, burnback, and gas postflow. All these various parameters would be controlled without
oversight from the robot control. Some of these items can be performed somewhat more quickly locally (on
the HMC-410), and thus may provide a slightly higher level of control.
In order to configure the HMC-410 for this mode, program the various segments of the weld on the
HMC-410 screens. For example, for a .2 second preflow set the time setting in the preflow setting to 0.2.
In order to program voltages or wire feed speed locally on the HMC-410, set the desired value in the appro-
priate window (voltage / pulse frequency in the center window; or wire feed speed in the bottom window) for
each phase of the weld.
In order to utilize the robot controlled settings, set the wire feed speed and/or voltage setting to EEE. This
will configure the HMC-410 to use the robot setting for that phase of the weld. The preset settings will be
displayed on the voltage and wire feed speed displays when the unit is run in its dry run test mode.
Typical Use Example
The following example should show the steps required to setup the system for a typical weld setup. Say
that a 1.5 second spot weld is desired, with a softer start setting for the first 1/2 second of the weld. In partic-
ular, say that the following welding parameters are desired:
Preflow Time: 0.5 Seconds
Runin
1
Time: 1.5 Seconds
Runin Voltage: 18.0 Volts
Runin Wire Feed Speed (WFS): 200 IPM
Weld Sub-Segment 1
2
First 1/2 Second of Weld Time: 0.5 Seconds
First 1/2 Second of Weld Voltage: 18.0 Volts
First 1/2 Second of Weld WFS: 200 IPM
Weld Sub-Segment 2
Next Second of Weld Time: 1.0 (Set by Robot)
Next Second of Weld Voltage(Programmed by Robot): 21.0 Volts
Next Second of Weld WFS (Programmed by Robot): 300 IPM
Craterfill Time: 0.1
Craterfill Voltage: 18.0 Volts
Craterfill WFS: 200 IPM
Burnback Time: .20 Seconds
Burnback Voltage: 12.0 Volts
430429-457
2-18 June 13, 2002
1 The HMC-410 adds a segment called the Runin segment that gives the operator control over the pre-arc strike
parameters. The Runin time is the amount of time that the HMC-410 allows for the weld to start. The Runin
voltage is the voltage that will be present at the time the wire touches the work. The Runin WFS is the speed
that the wire will be moving when the wire makes contact with the work. Once the point of contact and the
wire melts and becomes an arc, the control senses that an arc is established and proceeds with the settings in
the first weld sub-segment no matter how much time is left in the Runin Time Setting.