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Vgn technology control flow chart - single fan, General electrical controls information – Greenheck Vektor Laboratory Exhaust with VGN Technology Electrical Controls Information (476072) User Manual

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General Electrical Controls Information

VGN Technology Control Flow Chart - Single Fan

Positive Pressure Fault

Negative Pressure Fault

Above Setpoint

(more positive)

Send to BMS

Controller

Send to BMS

Controller

Below Setpoint

(more negative)

Above Setpoint

(more positive)

Below Setpoint

(more negative)

Yes

Yes

No

No

No

No

No

No

No

No

No

No

No

Yes

Yes

Yes

Yes

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

BMS Control

Drive Fault

Alarm

Drive

Fault Bypass

Mode

Static

Pressure =

Setpoint

Fan at

Full Speed

Required

Nozzle Area

Static

Pressure

Value

Static

Pressure

Valve

VFD

at Full

Speed

Increase

Fan Speed

Positive

Pressure

Alarm

Negative
Pressure

Alarm

Time Period

Met?

Max. VFD

Monitor

Time

Min. VFD

Monitor

Time

Damper
Position
Monitor

Time

Time Period

Met?

Time Period

Met?

Time Period

Met?

BMS Control

Bypass Damper

PID

Decrease

Fan Speed

Static

Pressure

Value

Open

Bypass

Damper

Close

Bypass

Damper

Bypass

Feedback

= Maximum

VDC

Bypass

Feedback

= Mimimum

VDC

Reset by

BMS

Reset by

BMS

Reset at

Fault CLR

Reset at

Fault CLR

Nozzle

Feedback at

Minimum

VFD at

Minimum

Speed

Static

Pressure =

Setpoint

Static

Pressure

Value

5

VGN Technology

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