A PPENDIX D: A UTOPULSE B ASED W IRING D IAGRAMS
Notes concerning the wiring diagram (March 2011+)
Power is brought into the electrical box ax 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 and air sensors.
Breakers are marked on the electrical diagram. There is:
(1) on the power supply secondary coil
o
(2) on the power supply primary coils
o
o (1) on the terminal strip for the differential pressure sensor
The overload may need to be reset. Most 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 should never be set to automatically reset.
A unit can be wired for both High Voltage (460 VAC 3 Phase) and Low Voltage (230 / 208 VAC 3
Phase.) Refer to the wiring diagram for jumper settings and motor wiring if it is necessary to change
the wiring of the unit.
NOTE: If the unit is being changed from High to Low Voltage (or vice versa,) the contactor,
overload, and power wires may need to be changed. If present, the VFD will definitely need to
be changed. This is because the lower voltage requires twice or more amperage. If the unit is
being converted to low voltage, the power wiring should be checked for proper gauge wires.
The wiring in the motor connection must be changed as well.
Wire numbers have been added to the wiring diagram to aid in both the diagnostic issues as well as
the maintenance and service issues while in the field.
The wire numbers will be shown in small black numbers at each end of the wire. The wires are
numbered by the ‘node,’ meaning that several wire s connecting into one point will have the same
number. Labels are placed on the terminal blocks as well as the wires.
Page 80
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