A variable frequency drive (VFD) is a motor controller connected with a motor, designed to regulate the ‘frequency’/voltage that is supplied to that motor. In the context of pumps, a VFD allows water flow to be turned up or down, because it can regulate the motor frequency.
If your pump has a variable frequency drive and this has stopped working, you may notice several signs of variable frequency drive failure. The most notable of these may be that water flow is affected, resulting in a low level of water flow when a higher level is desired. Outright failure may be easier to detect than malfunction.
Below we have listed a few possible causes of variable frequency drive failure, and what to do about them.
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Exposure to the environment.
Over time, your pump’s variable frequency drive may become exposed to the environment. Moisture, dust, or rust may all affect the ability of the variable frequency drive to function as it should. A variable frequency drive can be particularly prone to malfunction in certain environments, such as in waste water treatment settings, where it may be more prone to corrosion.
To treat this issue, you will often need to use a qualified pump installer who can provide advice on how to set up the pump system to reduce the risk of environmental exposure. By regularly servicing your pump, you can also limit the risk of these factors building up and affecting variable frequency drive performance.
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Imperfect electrical connections.
Just like the pump systems that they are a part of, variable frequency drives may be prone to high levels of vibration or heat that can ultimately loosen electrical connections. If these connections become loose, the operating of the variable frequency drive may become less reliable, or it could also lead to it operating at higher extremes than intended. Loose connections can lead to erratic behaviour from the variable frequency drive.
The risk of damage to equipment calls upon a prompt response from your pump service provider, such as Enviro Pump Services. Again, regular servicing can reduce the risk of this cause of variable frequency drive malfunction.
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Poor variable frequency drive/pump selection
All of the components of a pump system need to work together effectively for the pump to work for a long time. If components are mismatched, then an issue – such as variable frequency drive malfunction in your pump – is likely to emerge.
It is highly important that pump systems are selected by qualified pump suppliers and pump installers, like Enviro Pump Services, who can assess the suitability of the pump for the task that needs to be carried out. They can also help to ensure that the variable frequency drive is matched to the correct and compatible pump, and vice versa.
Diagnosing the issue with your variable frequency drive and pump system
If you suspect you have an issue with your pump’s variable frequency drive, contact Enviro Pump Services. We offer a Sydney pump service, pump maintenance, sewer pumps, storm water pumps, pump repairs and more, and our after-hours service can help to address your pump issues in a timely manner. For more information on our Sydney pump services, contact us on 1300 141 315 or info@enviropump.com.au.