Orion System VCC-X Controller - Manual (Page 34)

Zone
Zone
VCC-X CONTROLLER WIRING
VCC-X Controller Technical Guide 34
Supply Fan VFD Wiring
24VAC
GND
Line
Voltage
Size Transformer For
Correct Total Load.
VCC-X Controller = 15 VA
VCC-X Controller
+
Supply Fan Variable Frequency Drive
(By Others)
_
0-10VDC Input From AOUT1
GND
Caution: The VFD Unit Must Be Configured For 0-10
VDC Input. The Input Resistance At The VFD Must Not
Be Less Than 1000 Ohms When Measured At The VFD
Terminals With All Input Wires Removed.
Note: Wire To The VFD Using 18 GA
Minimum 2 Conductor Twisted Pair
With Shield Cable. Wire Shield To GND
As Shown.
AOUT1
GND
Shield
Figure 19: Supply Fan VFD Wiring
Supply Fan VFD Signal
The Supply Fan VFD Signal is a user-adjustable signal with a range
of 0-10 VDC from AOUT1 on the VCC-X Controller. This signal
output can be connected to the Supply Fan Variable Frequency Drive
to modulate the Supply Fan speed.
See Figure 20 below for detailed wiring.
CAUTION: Variable Frequency Drive units can cause large
transient noise spikes which can cause interference to be
propagated on other electronic equipment. Use shielded wire
wherever possible and route all sensor and controller wiring
away from the Variable Frequency Drive and the HVAC Unit
electrical wiring.