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

General Electrical Controls Information
VGN Technology Control Flow Chart - Multiple Fans, With Staging
Positive Pressure Fault
Negative Pressure Fault
No
Max. VFD
Monitor Time
Above Setpoint
(more positive)
No
VFD(S)
Full Speed
Increase
Fan(s) Speed
Send to
BMS Controller
®
BMS
Control
Deadband Range
Fan On/Off
Yes
Cycling
No
Yes
Drive Fault
Bypass
Mode
No
Yes
Fan(s) in
Stall Mode
No
Static
Pressure
Value
Static
Yes
Pressure
= Setpoint
No
Below Setpoint
(more negative)
Static Pressure
Value
Yes Yes
Fan(s)
Time Period
available to
Met?
add
No
No
Time Period
Reset at
Met?
Fault
Clr
Yes
Add a
Positive Fan
Pressure
Alarm
Yes
Fan Stall
Monitor Time
No
Time Period
Met?
Reset by
All Nozzle
Feedback at
Minimum
Reset by
No
BMS
Yes
No
VFD(S) Fan(s)
Minimum Running
Speed = 1
Time Period
Met?
BMS Control
Bypass Damper
Decrease
PID
Fan(s)
Speed
Static
Pressure
Value
Static
Yes
Pressure
= Setpoint
Above Setpoint
(more positive)
Static
Pressure
Value
Close
Bypass
Damper
Bypass
No Yes
Feedback
= Min. VDC
No
Yes
Time Period
Met?
Reset by
BMS
BMS
Yes
Remove
a fan
Time Period
Met
Yes
Yes
No
Time Period
Met?
Yes
Reset by
BMS
Reset by
BMS
Yes
No
Below Setpoint
(more negative)
Open
Bypass
Damper
Bypass No
Yes
Feedback
= Max. VDC
No
Time Period
Met?
Reset at
Fault
Yes
Clr
Negative
Send to
Pressure
BMS Controller
Alarm
VGN Technology
Yes
Drive Fault
Alarm
Reset by
BMS
Fan
Full Speed
Yes
Required
Nozzle Area
Damper
Position
Monitor
Time
11