Greenheck Vektor Laboratory Exhaust with VGN Technology Electrical Controls Information (476072) - Manual (Page 23)

Communication
The VGN Nozzle Controller uses digital and analog
signal(s) that need to be wired to the BMS system. The
electrical installer can reference the “Nozzle Controller”
wiring diagram for specific hookup locations and
information.
The following is a list of the BMS points from the Nozzle
Controller when the VFD is supplied by others and not
the factory.
Nozzle Controller Enclosure
1. Digital Input – Relay contact from the customer
supplied VFD to terminals +24V and FNRUN.
2. Digital Output – Dry relay contact for system alarms
from terminals ALM and COM.
3. Analog Output – Voltage output (0 to 10VDC) for fan
flow from terminals CFM1 and COM.
NOTE: CFM scale is displayed on the “AIR FLOW”
menu and then “FLOW SCALE” line.
Transducer J-Box Enclosure
Analog Output(s) – Voltage output from nozzle actuator
feedback as 2 VDC as the minimum signal. The
maximum voltage signal varies depending on fan size
but has a maximum signal of 10VDC. The terminal
connections are at NOZFB1 (shaft 1), NOZFB2 (shaft 2),
and COM.
NOTE: The feedback is necessary to monitor for
minimum VFD speed. When the output is 2VDC (and
nozzle is at minimum area) it is necessary not to drop
fan speed further as outlet velocity will drop below
desired preset value.
Electrical Controls Information for Customer-Supplied Variable Frequency Drive
23 VGN Technology
®