Lincoln Electric IM10090 ARC TRACKER - Manual (Page 20)

D-1 MAINTENANCE D-1
Required equipment:
• Power source to provide welding current and volt-
age. The power source should be capable of pro-
ducing the same level of welding current and volt-
age as the ARC TRACKER™ application. It is rec-
ommended to use the same power source used in
the welding application for this calibration proce-
dure.
• Calibrated reference volt meter, shunt and amme-
ter as in Figure D.1. The recommended accuracy
must be at least four times the desired accuracy of
the digital meters on the ARC TRACKER™ being
calibrated. Example, to obtain +/-2% accuracy, the
shunt accuracy and ammeter accuracy combina-
tion must be +/-0.5% accurate. The meters listed
below have been verified to produce accurate
results with inverter power sources. If other
meters are used, the compatibility and accuracy
with inverter power sources must be determined
by the user.
Volt meter: Keithley 2701 Digital Multimeter
Ammeter: Keithley 2701 Digital Multimeter
Shunt: GE 1000A/100mV Master Shunt
• Resistive Load, such as Lincoln Electric Master
Load 750 (750 A max).
• ARC TRACKER™ being calibrated.
• 4/0 welding cables
Test Setup:
Connect equipment as shown in Figure D.1.
ARC TRACKER™
SAFETY PRECAUTIONS
ELECTRIC SHOCK can kill.
• Only Qualified personnel should
perform this maintenance.
• Turn the input power OFF at the
disconnect switch or fuse box before
working on this equipment.
• Do not touch electrically hot parts.
------------------------------------------------------------------------
See additional warning information
throughout this Operatorʼs Manual
------------------------------------------------------------
WARNING
CALIBRATION SPECIFICATION
The ARC TRACKER™ as shipped from the factory
has +/-2% accuracy on the digital volts display and
amps display. Due to the heat input calculation being
a function of measured volts, amps, and arc on-time,
the displayed energy value has an accuracy of +/-5%.
The Lincoln Electric Company recommends that end-
users of its welding equipment evaluate the suitability
of utilizing the ARC TRACKER™ in their quality sys-
tem.
Determine if periodic calibration is required and the
calibration interval based upon the criticality of the
welding application, the environment in which the
equipment is located, the level of preventive mainte-
nance and the actual conditions of use.
FIGURE D.1