USF Motors and Controls 7
Induction Motors with VFD
The USF offers a complete programmed and wired controls solution for AC induction motors with variable frequency
drive (VFD). In this setup, we supply a NEMA-3R control box, disconnect switch, transformer, VFD and VG-HOA
controller as an accessory to the fan. This package comes as an option to be mounted and wired to the fan on direct
drive (arrangement 4) configurations or shipped loose on all arrangements, including arrangement 4.
VFD Options
Model USF uses two VFD models. The manufacturer is ABB for both, and the models used are the
ACS-255 and ACS-320. These different models were used to handle different voltages and phases.
The ACS-255 is used on 115V, 1-phase and 575V, 3-phase
offerings. This option is supplied in a ship loose control box only.
The ACS-320 is used on 208-230V, 1-phase and 3-phase. It is
also offered on 460V, 3-phase. This option is supplied in either a
ship loose control box for any arrangement or also as a mounted
and wired version if the fan is an arrangement 4 direct drive.
When a VFD option is used, induction motors are always 3-phase, no matter the fan input phase. When a single
phase VFD is used, the drive converts the phase from one to three upon outputting to the motor.
For more information on the ACS-255 including manuals, see ABB website:
https://new.abb.com/drives/low-voltage-ac/micro/acs255
For more information on the ACS-320 including manuals, see ABB website:
https://new.abb.com/drives/low-voltage-ac/industry-specific-drives/acs320
VFD Options
Voltage 115 208, 230 208, 230 460 575
Phase 1 3
Horsepower 1/2 - 1 1/2 - 3 1/2 - 10 1/2 - 30 1/2 - 20
VFD Model ACS-255 ACS-320 ACS-320 ACS-320 ACS-255
Control Box Mounting Ship Loose
Mounted & Wired,
Ship Loose
Mounted & Wired,
Ship Loose
Mounted & Wired,
Ship Loose
Ship Loose
NOTE
VFD models may be subject to change without notice based on manufacturer availability.
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