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VFD Parameter Info
If 3-15 is set to Analog Input 53 (with a communicating VFD) the VFD will only run minimum speed.
If 8-01 is set to Digital (on a communicating VFD) the fan won't run and you get an Alarm on the Symbio
for Supply Fan Failure.
If 8-30, 32 or 33 is set wrong (on a communicating VFD) the fan won't run and you get an Alarm on the
Symbio for Supply Fan VFD Communication.
If you are in the UI and accidently change something to a value requiring a VFD (and you don’t have a
communicating VFD) you will get a diagnostic for VFD comm fail until you cycle power.
VFD Harness Part Numbers
Wire Harness, VFD Pigtail, Two Speed, PPF53 to VFD is WIR01085
Wire Harness, Supply Fan Controls, Two Speed, PPM53 to Relay Board P11 is WIR01090
VFD Faults requiring Manual Reset
Diagnostic: Supply Fan Failure
If while the Supply Fan VFD is requested to run, the VFD Running Status from the drive is set to False for
40 continuous seconds, this failure will be detected
All unit functions will be shut down immediately – Requires Manual Reset or Power Cycle
Supply Fan VFD Communication Status
If continual loss of communication between the controller and the VFD has occurred for a 30 second
period, this failure will be detected.
All unit functions will be shut down immediately – Requires Manual Reset or Power Cycle
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