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4.5 Operation
The MANUAL/OFF/AUTO switch on the control panel will turn on the fan motor in either of the MANUAL
or AUTO positions. The MOTOR RUNNING light will illuminate once the motor has started.
Note that the motor ramps to start and ramps to stop at the specified rate (30 seconds to or from full
speed as default) and should be allowed sufficient time to achieve its final state before any other action
is taken (such as a restart).
In MANUAL mode, the fan motor will start immediately and ramp up to full speed. If external interlocks
are installed, the motor will not start in AUTO mode until the external condition is satisfied. Multiple
damper contacts wired in parallel will give a first-on/last-off functionality, and the target duct pressure
will be maintained regardless of how many dampers are open.
To avoid overheating the motor due to lack of airflow, the fan should never be operated unless at
least one damper is open.
4.6 Troubleshooting
The latest generation of VFDs is remarkably robust and reliable. In addition, they have extensive self-
protection and self-diagnostic capabilities. In case of drive failure, error code(s) are displayed which
point towards fault correction procedures. See section 13 of the Invertek Optidrive ECO User Guide (or
the appropriate sections for the other drive types) for detailed information.
Other areas to verify are the electrical connections, the status of fuses and/or circuit breakers, and the
integrity of the pressure sensing tubing and its connections. All VFD parameters should also be validat-
ed against the initial setup list to eliminate any uncalled-for changes. The zeroing of the pressure sensor
may also be re-verified.