Arc Machines 207 - Manual (Page 60)

MODEL 207A AND 207A-1
OPERATION MANUAL
Doc. No. 740044
Rev F
SECTION VII - CALIBRATION
7.0 INTRODUCTION
This procedure is intended for calibration/certification of system performance by
the user. Except for the Current Servo all system functions are controlled by the
processor and no calibration points or steps are required. Rotation calibration is
contained in section 5 and is automatically done by the M-207A. It can be
verified by a physical count of rotation versus time if required.
An examination of internal electronics will find several adjustment points. These
points are “Factory Pre-set” only and ARE NOT to be adjusted by the user.
CAUTION
All personnel attempting to calibrate, trouble-shoot, or repair this system must be
familiar with its operation. They must understand the circuits and have a complete
understanding of the controls and their interrelationships.
WARNING
All personnel must be aware of the location of hazardous voltage--carrying
conductors, terminals, heat sinks, etc., and must employ safety precautions when
working with the welding machine.
Any testing or recording instruments connected to any points in the machine or to
the welding head may be exposed to extremely high transient voltage at the time
the arc starter operates. ENSURE THAT ALL TEST EQUIPMENT IS
DISCONNECTED DURING ARC START.
NOTE
Rotation (Travel) Calibration, in conjunction with a Weld Head, is perfomed on a
frequent basis and is covered as part of Section V (operation).
7.1 EQUIPMENT REQUIRED FOR CALIBRATION
1. Digital Multimeter (DMM), minimum 4 - digit readout. Suggested: Fluke
Model 8060A or equal. The meter must have floating inputs (not connected to
line or chassis ground) of minimum 1 megohm input impedance. Battery
operated devices are recommended.
2. Screwdriver, calibration, small slot with 6” shaft.
3. Hex wrench set
4. M-9 Weld Head rated for 100 amperes and pipe/tube that will not melt away
with 100 amperes or manual torch set up on flat plate (see step 7.2.2).
5 AMI External Shunt, 1 mv/amp, PN 1357238-01 (optional)
6. Argon or other acceptable GTAW gas source.
7.1