Variable Frequency Drive (Vfd); Enabling Vfd - MultiTrode MultiSmart Installation & Operation Manual

MultiSmart Installation & Operation Manual

23 Variable Frequency Drive (VFD)

The MultiSmart can control VFD drives through an analog output. This is an optional feature that must be
enabled on the MultiSmart before it can be used. (If not enabled at the time of purchase, it can be enabled
later with a new Site Key).
The VFD feature coordinates and alternates drives so that the flow does not fluctuate as extra pumps are
turned on and off. A single analog output is used as the control signal to all VFD drives. As new pumps are
started, the overall VFD speed is reduced.
For example, if one pump is running at 100% and a second one is about to start at 30%, the algorithm in the
pump station manager adjusts the speed of both so that they run at 65%. This ensures a smooth power
curve with both pumps running at the same speed.
The VFD algorithm varies the speed of the pumps as the well level varies. It is likely that during steady
inflows the system may equalise, and hence run continuously with the outflow matching the inflow. We highly
recommend that you enable the Maximum Run Time function (Section 16.3) to ensure that the pumps
alternate under this situation.
The following steps are required to configure VFD:
1) Enable and configure VFD functionality
2) Setup the individual pump control parameters
3) Configure the analog output as a source to drive the VFD

23.1 Enabling VFD

To enable and configure the VFD drive functionality:
Navigate to:
•
Configure the settings listed in the screen and table below as required for the application
•
Press the Save button when finished
Figure 160- VFD Settings Screen
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