Support
In reality when considering installing a VSD :
• Most VSDs are dust sensitive , an appropriate dust filter needs to be installed when operating in dusty conditions – they also need to operate within specified temperature and humidity parameters .
• Conduct a proper feasibility study before investing in a VSD to ensure that it is the best solution to optimise your HVAC system .
• VSDs can increase harmonics in the electricity supply , which disturb the sine curve of the alternating current and cause motors to run warmer than they are designed for , reducing their life expectancy . Harmonics can also decrease the life expectancy of computers and negatively influence the operation and accuracy of electronic measuring devices . The appropriate harmonic filters and necessary chokes must be installed along with the VSD to filter out the harmonics and protect your equipment .
• Once installed , a VSD must be properly programmed – incorrect setting of parameters will result in poor control and energy wastage .
• Regular maintenance of VSDs and associated motors is obviously essential to maintain energy savings . Preventive maintenance is less expensive than correcting faults , repairs and having to deal with unanticipated breakdowns , loss of production and unhappy clients .
To sum up , these are the benefits when using a VSD :
• Lower energy usage
• Achieve cost savings
• Operate lower speeds resulting in quieter systems
• Control starting current and acceleration
• Increase motor and equipment longevity
• Eliminate expensive mechanical drive components
• Limits and controls torque
• Adjust and control operating speed
• Controlled motor stopping
• Achieve reverse operation
• Reduced start up inrush current
• Achieve more efficient HERVAC systems
• Increase motor starts per hour
• Benefit from built-in motor protection
Thank you for your question Ryan , I hope that we helped you with motor starter understanding .
Thank you for all your questions . Send your problems ( and sometimes your creative solutions ) to acra @ netactive . co . za with ‘ Solutions Page ’ in the subject line . You may include pictures .
REFERENCES : 1 . ACRA 2 . Myelectricalsolutions RACA
RACA Journal I March 2023 43