17
3940011 12.12
4.4 Wiring the Draft System
a. Three-phase Fan
For systems using a 3-phase fan, a variable frequency drive (VFD) controls and modulates the fan
speed. The fan connects to the VFD as shown (DO NOT connect the fan directly to the EBC 30
control). The VFD runs off a 0-10 VDC signal from the EBC 30. See Fig. 12 and 13 for connection
detail.
NOTE: Before wiring, verify that the supply voltage matches the voltage rating on the VFD and the
motor
nameplate.
Fig. 14 shows the connection of the fan to a VLT 2800 series VFD.
Fig. 14
