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4.2 Electrical Installation
Power wiring must observe the requirements of the Canadian Electrical Code CSA C22.1-15. Addition-
ally, screened wiring is recommended for the connection from the VFD to the motor. See section 4 of
the Invertek Optidrive ECO User Guide (or the appropriate sections for the other drive types) for de-
tailed installation information.
See the appropriate Appendix for the system schematic. Control wiring requires the connection of 7
wires to the control cabinet terminal strip. There are 3 wires plus one twisted shielded pair to the VFD
and two terminals available for wiring to optional external start/stop interlocks. If unused, these termi-
nals must be left shorted with the wire that comes pre-installed from the factory. Recommended cable
types are shown on the schematic.
Note the jumpers on the VFD and ensure they are in place.
4.3 Pressure Sensor Setup
A single push button is provided to zero the transmitter. Allow transmitter to warm up for 20 minutes.
The zero calibration can be set by applying zero pressure to both the pressure ports (block them off) and
pressing the zero button for 2 seconds. Span is factory calibrated to the range specified on the label.
There is no user span adjustment necessary.
4.4 VFD Setup
Consult the Commissioning section (7) of the Optidrive User’s Guide (or the appropriate sections for the
other drive types) before proceeding.
Standard VFD setup is shown on the schematic. For detailed information see sections 5 and 8 of the In-
vertek Optidrive ECO User Guide (or the appropriate sections for the other drive types). When perform-
ing this setup, a comprehensive list of all parameter settings should be created for future reference.
To set the motor speed to achieve target negative pressure, follow the instructions in the VFD setup ta-
ble on the schematic. If, after performing this setup, the drive is unstable or “hunting”, PID integration
time may be too short – try increasing it gradually until stability is restored. Note that this will slow
down the response of the system to step changes such as opening or closing a damper.