Why Variable Speed Drive motors fail & how to prevent it

If you own or run a business that involves large machinery, it’s more than likely you are operating a number of Variable Speed Drives (VSDs). While modern VSDs are exceptionally reliable, like all electronic equipment, if they’re not installed or maintained properly, tripping or failure can occur. In the following we set out the most common causes for VSD failure and how to prevent it.

Incorrect installation

Nothing contributes to the failure of a VSD more than incorrect installation, yet it is also the easiest issue to avoid. First, always engage a certified professional to install the VSD, ideally in an area where the ambient temperature does not exceed 40°C. If temperatures do exceed this level, it is possible to cool the drive externally, but this will impact on energy usage.

Secondly, the VSD should be installed in an area where it is protected from moisture. If it’s being employed in an industry where machinery is regularly washed down, such as the food industry, the VSD must be mounted in an enclosure with the appropriate Ingress Protection (IP) rating, to avoid corrosion of the circuit boards.

Lack of Regular Maintenance

It is imperative that you organise regular inspections of your VSD to avoid failure, as this is going to save time and money in the long-term. Inspections should be carried out annually by a registered professional and any issues that are identified should be dealt with promptly.

While it is always best to leave maintenance to the professionals, there are some basic things you can do throughout the year that will keep your VSD in good working order. These include: keeping the heat sink fan free of dust by spraying compressed air through the fan; checking the connections on a regular basis to prevent arcing; and running the capacitator at full output every six months to prolong its life.

Exceeding the VSD’s Operating Limit

Running the motor in excess of its capacity is a major cause of VSD failure, so ensure that those who are operating the motor are fully trained and educated about its rated level. The best way to avoid pushing the VSD beyond its limits is to engage the professionals who installed the motor to train those who are going to be operating it in the correct use. Additionally, set up an internal VSD training program for any new employees.

Following the above guidelines for installation, maintenance and operation means your business will reap the full benefits of your Variable Speed Drive motor/s in terms of efficiency, reduced wear and tear and increased control over your machinery.

Contact Caslec to find out how we can assist you in the installation and maintenance of a Variable Speed Drive motor. Call us on 1300 659 273 today.