Greenheck Vektor Laboratory Exhaust with VGN Technology Electrical Controls Information (476072) - Manual (Page 8)

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