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Additional Operating Information
Normal operating temperature is 14-104°F (-10-40°C).
Normal operating altitude is 0-6,600 ft above sea level (0-2,000 m).
Flipping the disconnect switch "ON" energizes power to the fan.
•
If motor is installed with no additional controls, the motor will increase RPM until nameplate RPM is reached.
•
If fan has local controls (no external control signal), the motor will increase RPM until set point is reached (either
by motor dial or HOA preset).
•
If fan is using an external control signal, motor will increase RPM until control signal set point is reached.
For additional details on adjusting motor RPM with the dial (VG only), refer to the section on VG-BLDC basic
assembly.
All other motor technologies will utilize the Vari-Green HOA controller.
The HOA provides a common interface and wiring connection point for the operator. It takes either a local setting
or remote signal and communicates to either the Vari-Green motor or the variable frequency drive (VFD) in order to
control the motor speed.
The control box operates with the HOA providing two signals to the VFD.
1. HOA closes relay when control signal voltage is greater than 1.8V.
•
VFD will receive run enable signal.
•
Operational damper actuator: Fan will not receive run enable signal until damper actuator has fully opened and
the actuator relay has closed.
2. VFD receives 2V-10V signal from HOA and the output frequency responds relative to programmed minimum and
maximum frequency.
Calculation to determine 10V control signal to achieve desired fan RPM.
All VFDs have been programmed to operate on a 2-10V with a 10 Hz minimum and order specific Hz maximum.
(10v - 2v) x (Operating Hz - Minimum Hz)
HOA Voltage =
Example:
1360 rpm slower operating point
1622 selected fan rpm
1770 rpm motor
Operating Hz = 1360/1770 x 60 = 46 Hz
(10v - 2v) x (46 Hz - 10 Hz)
HOA Voltage =
*Drive programming and scaling subject to change by factory.
Our Commitment
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications
without notice.
Product warranties can be found online at Greenheck.com, either on the specific product page or in the literature
section of the website at Greenheck.com/Resources/Library/Literature.
Greenheck's USF catalog provides additional information
describing the equipment, fan performance, available
accessories, and specification data.
®
Phone: 715.359.6171 • Fax: 715.355.2399 • Parts: 800.355.5354 • E-mail: gfcinfo@greenheck.com • Website: www.greenheck.com
12
1037587 • USF Motors and Controls, Rev. 1, August 2023
(Maximum Hz - Minimum Hz)
Maximum Hz = 1622/1770 x 60 = 55 Hz
+ 2v
(55 Hz - 10 Hz)
+ 2v
= 8.4v
AMCA Publication 410-96, Safety Practices for Users and
Installers of Industrial and Commercial Fans, provides
additional safety information. This publication can be obtained
from AMCA International, Inc. at www.amca.org.
Copyright 2023 © Greenheck Fan Corporation
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