UC800 AFD Operation
AFDG-SVU01L-EN
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UC800 Interface to Adaptive Frequency
Drive
The UC800 provides a “Start” contact closure output to
command the Adaptive Frequency Drive to begin its start
sequence. A 2–10 Vdc analog speed signal output is
provided by the UC800 to provide a speed reference to the
drive. The UC800 also provides both “Fault” and “Up-to-
Speed” (transition complete) contact closure inputs for
variable frequency drive starters.
At start of the compressor motor, a signal corresponding
to normal line frequency (Full Speed) is applied to the
speed signal input of the drive.
Figure 16.
Drive frequency vs. speed reference signal
VFD / Starter Module Speed Reference vs. Drive Frequency
AFD
2.0 Vdc
10 Vdc
60 Hz
38 Hz
