A PPENDIX D: W IRING D IAGRAMS (M ARCH 2011+)
Notes concerning the wiring diagram:
Power is brought into the electrical box as 460 / 230 / 208 Volt AC three phase or 230 / 208 Volt AC single phase. Power is then branched to the transformer via a single phase. This transformer converts the 460 / 230 / 208 Volt AC single phase to 120 Volt AC single phase. This is then branched to 24V DC for the controller, LED lights, and air sensors.
Breakers are marked on the electrical diagram. There are:
(1) on the transformer secondary coil
(2) on the transformer primary coils.
(1) on the terminal strip for the differential pressure sensor
(1) on the terminal strip for the lighting circuit
The overload may need to be reset. The Eaton overloads have an automatic reset function, which is turned off. If this has not been set, the overload will require being reset via the red button marked 'Reset'. This switch is also used to set the Auto / Manual Function. A unit can be wired for both High Voltage (460 VAC 3 Phase) and Low Voltage (230 / 208 VAC 3 Phase). The jumper(s) on the input 'H' side of the transformer change depending on the input voltage. For changing the wiring of the unit, refer to the wiring diagram for jumper settings and motor wiring.
NOTE:
If the unit is being changed from High to Low Voltage (or vice versa), the contactor and overload may need to be changed. This is because the lower voltage requires twice the amperage. If the unit is being converted to low voltage, the power wiring should be checked for proper gage wires. The wiring in the motor connection must be changed as well.
Copyright © Clean Air America, Inc.
Weld Station User Manual, March 2011
Page 107 of 112
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