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Group Settings: These settings define the action of all fans linked to a specific group. All fans linked to the
same group will start, modulate and stop together.
• Activation Temperature: The temperature at which fans will automatically turn on when the fan group
is set to AUTO mode. When the room temperature rises above the activation temperature, all VFDs in
the group will activate.
• Modulation Band: Once the fan group activates by the Activation Temperature, fans will modulate
from low to high speed within the modulation band. Low speed occurs when the room temperature is
equal to the Activation Temperature. High speed occurs when the room temperature is equal to
Activation Temperature + Modulation Band. Fan speed is linear along the modulation band.
• Hysteresis: As the room temperature decreases below the activation temperature set-point, the fans
will continue to operate at their minimum speed until the temperature falls below the HYSTERESIS
temperature. Fans will run on low speed until the room temperature falls below (activation temp –
hysteresis temp). The fans will stop and will stay off until the temperature rises back above the
activation temperature.
• Minimum Cycle Time: The MINIMUM cycle timer is in the system to help prevent frequent fan cycling.
Once the fans start, the fans will run for at least this amount of time before turning back off. Once fans
automatically activate, the room temperature must fall below Activation Temperature - Hysteresis band
and run for the minimum cycle time to automatically shut off.
• Maximum VFD Frequency: The Maximum VFD Frequency is the maximum speed the fans will
operate in Manual, Auto, and BMS modes. It defines the upper limit speed for fans to protect fan
motors from experiencing an over-amperage situation.
• Minimum VFD Frequency: The Minimum VFD Frequency is the minimum speed the fans will operate
in Manual, Auto, and BMS modes. It defines the lower limit speed for fans to protect fan motors from
experiencing an overheating situation.
• High-Temperature Alarm: The High Temperature Alarm is the Room Temperature that will cause
fans to shut down in an emergency. If any sensor linked to a fan group sees a temperature equal to or
higher than the High Temperature Alarm, that sensor will cause all fans in that fan group to stop.
• Low-Temperature Alarm: The Low Temperature Alarm is the Room Temperature that will cause fans
to shut down in an emergency. If any sensor linked to a fan group sees a temperature equal to or less
than the Low Temperature Alarm, that sensor will cause all fans in that fan group to stop.
• Reverse Temp (HVLS only): If the temperature falls below this value, the fan will run in reverse at the
‘Rev. VFD Freq’.
• Rev. Hysteresis (HVLS only): If the temperature goes above reverse temp + hysteresis, then the fan
will no longer operate in reverse mode as long as the min cycle time has expired.
• Rev. VFD Freq. (HVLS only): This is the speed at which the fan will run when activated in reverse
mode.
Temperature Unit Select: Use this menu to change the units of temperature from degrees F to degrees C.
This changes all activation, hysteresis, modulation band, high temp limit and low temp limit ranges, and
default values. Also, all monitored temperature units are changed. When this setting is changed, all
temperatures are reset to default settings and configur
ation of all temperatures must be manually reset.
Fan Direction: The direction of rotation of three-phase fans can be switched by this parameter. Changing
from Forward to reverse will change the default rotation of each individual fan. This will help align all fans to
the proper rotation orientation for use with the HMI. It also allows fan rotation change without re-wiring the
output of the Variable Frequency Drives.
Set HMI Dimming: The back-light on the HMI LCD display can be configured to automatically dim. With
this option off, the HMI stays illuminated all of the time. With this option on, the HMI back-light will
automatically dim after a configurable time after the last button press. The HMI will illuminate automatically
when any button is pressed.
Set Dim Delay Time: When the HMI is configured to dim automatically, this parameter sets the amount of
time that the HMI back-light will stay on after the last button press.
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