Variable Frequency Drive (Vfd); Enabling Vfd - MultiTrode MultiSmart Installation & Operation Manual
Pump station manager & rtu
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- Installation & operation manual (260 pages) ,
- Integrator manual (20 pages)
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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.
Also 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 141- VFD Settings Screen
Page 164 of 201
MultiSmart Installation & Operation Manual
MultiSmart_IO_Manual_A4_v2-22_R15.doc
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Questions and answers
I have four pumps connected to my multi smart. One jockey and three that rotate with the jockey as needed. My problem is that the jockey pump always shows its running even when it isn't running. the other pumps show actuate run times and starts. only the main pump shows continuous run even when it is turned off. I was wondering if there any advice I could be given to resolve this issue.
The MultiTrode MultiSmart may show the jockey pump as continuously running even when it is turned off due to the "External Run" status. This occurs if the pump is started by an external control method, such as a manual override switch, where the contactor remains closed but no run command was sent by the controller. As a result, the system continues updating run time statistics and generating relevant faults or warnings. Checking for an external control signal or a stuck contactor may help resolve the issue.
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