INSTALLATION
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Read and understand entire Installation Section before starting installation.
WARNING
ELECTRIC SHOCK can kill.
•Only qualified personnel should perform this installation.
•Turn the input power OFF at the disconnect switch or fuse box before installing this equipment.
•Turn the power switch on the Invertec STT “OFF” before connecting or discon- necting input power lines, output cables, or control cables.
•Do not touch electrically hot parts.
•Always connect the ground terminal to a good electrical earth ground.
MACHINE GROUNDING AND HIGH FREQUENCY INTERFERENCE PROTECTION
The machine may not be suitable for use in an envi- ronment where high frequency is present. For exam- ple do not place the machine in close proximity to “TIG” or “PLASMA” operations. To minimize high frequency interference:
Locate the STT II power source more than 15 feet (4.5 m) away from high frequency units and more than 25 feet (7.6 m) separation between ground connections or welding arcs of high frequency units.
Provide proper electrical ground to the machine per local and national electrical codes.
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SELECT SUITABLE LOCATION
Locate the machine where there is free circulation of clean air. Place the machine so that air can freely cir- culate into the sides and out of the rear of the machine. Dirt and dust that can be drawn into the machine should be kept to a minimum. Failure to observe these precautions can result in excessive operating temperatures and nuisance shut down of the Invertec STT II.
This machine carries an enclosure rating of IP21S. It should not be placed in extremely damp or dirty loca- tions. It should not be exposed to rain or snow.
STACKING
The Invertec STT II cannot be stacked.
TILTING
Place the machine on a secure, level surface otherwise the unit may topple over.
INPUT CONNECTIONS
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN CAUSE IMMEDIATE FAILURE OF COMPO- NENTS WITHIN THE WELDER.
Turn the input power off at the disconnect switch before attempting to connect the input power lines.
Connect the green lead of the power cord to ground per local and national electrical codes.
SUPPLY CONNECTIONS
Be sure the voltage, phase, and frequency of the input supply is as specified on the rating plate. Input Power supply line entry in provided on the case back of the machine. See figure A.1 for location of the rating plate.
The Invertec STT II should be connected only by a qualified electrician. Installation should be made in accordance with local and national codes. Refer to the “Technical Specifications” at the beginning of this section for proper fuse sizes, ground wire, and input supply power cable sizes.
Some models come from the factory with an input power cord. If your model does not include the input power cord install the proper size input cable and ground cable according to “INPUT CABLE INSTAL-
LATION AND CONNECTION”.
INVERTEC STT
