Owner`s manual

CobraTig
®
150 Owner's Manual - Page 15
Connect an external DC voltage power supply to the shunt connectors
labeled ‘ARC VOLTAGE’ and adjust to 1.8 VDC input. Reference the
VDC bar graph on the LCD screen, press the 1.8 VDC button, this will
set the calibration.
Set the input to 18.0 VDC and repeat the above process. The procedure
will cycle through twice for an average reading and setting, then quit
when ready.
Adjust Up
Press this button to adjust the bar graph setting to match that of the
reference value being read - voltage or current.
Motor Calibration
With the weldhead plugged into the CobraTig 150 SM rear panel, the
motor voltage output to the weldhead, and tachometer feedback from the
weldhead rotor can be calibrated.
This screen will allow the operator to calibrate any orbital weldhead,
at any speed value, between 1.0 and 10.0 rpm. Using the HIGH/LOW
button, select the respective speed value and use the ADJUST UP and
ADJUST DOWN buttons to select the rpm value required.
The HIGH and LOW values can never be equal. A minimum of 1.0 rpm
will separate the two values. If the LOW value is increased, the HIGH
will increase, with the 1.0 rpm difference between them. Similarly, if the
HIGH is decreased, the LOW will decrease with the 1.0 rpm difference.
Feedback of the weldhead during calibration is seen in the bar graph on
the left side of this screen.
High/Low
Toggles between the HIGH and LOW rpm speed values.
Print Report
Press this button, once calibration is complete, to view a printed report of
the calibration values.
The calibration values shown are an indication of the MOTOR/TACH
status of the weldhead. A typical printout is shown below:
MOTOR Calibration report
MOTOR gain: -4.6% Zero offset: 0.30 RPM
TACH gain: 1.9% Zero offset: 0.02 RPM
Should these MOTOR & TACH values return with number of 0.00% and
0.00 RPM, the calibration was invalid and should be re-run. Continuous
results of all zeros, is an indication that the weldhead is in need of
service.
Consult the weldhead owner’s manual for proper maintenance and
calibration service.