Vgn Technology Control Flow Chart - Greenheck Vektor Installation, Operation And Maintenance Manual

General Electrical Controls Information
VGN Technology Control Flow Chart - Single Fan
Increase
Fan Speed
Send to BMS
Controller
®
Positive Pressure Fault
Negative Pressure Fault
Max. VFD
Monitor
Time
Yes
Above Setpoint
(more positive)
VFD
No Yes
at Full
Speed
No
Time Period
Met?
Yes
Positive
Pressure
Alarm
BMS Control
Yes
Drive Fault
Alarm
Drive
Yes
Fault Bypass
Mode
No
Static
Pressure
Valve
Static
Pressure =
Setpoint
No
Below Setpoint
(more negative)
Static
Pressure
Value
Nozzle
Feedback at
Minimum
No
VFD at
No
Minimum
Speed
Yes
Reset at
Fault CLR
Bypass Damper
Decrease
Fan Speed
Yes
Above Setpoint
(more positive)
Close
Bypass
Damper
Bypass
No Yes
Feedback
= Mimimum
VDC
Yes
Time Period
Met?
Reset by
BMS
Fan at
Full Speed
Required
Nozzle Area
Yes
Min. VFD
Monitor
Time
No
Time Period
Met?
Reset by
BMS
Yes
BMS Control
PID
Static
Pressure
Value
Static
Pressure =
Setpoint
No
Below Setpoint
(more negative)
Static
Pressure
Value
Open
Bypass
Damper
Bypass
Yes No
Feedback
= Maximum
VDC
No No
Time Period
Met?
Reset at
Fault CLR
Yes
Send to BMS
Negative
Pressure
Controller
Alarm
Yes
Damper
Position
Monitor
Time
5
VGN Technology