Variable Frequency Drive (VFDs) troubleshoot, repair, and installation Service. We at Shuaa Al Buraq provide top-notch repair service to troubleshoot, diagnose and refurbish your Variable frequency drives (VFDs).
Renting a VFD can be a good option for customers looking for a short-term solution to control a motor’s speed and create a softer ramp up. One concern we’ve heard from customers before is knowing whether or not the rental VFDs are in good condition and can fulfill their needs.
Recently we were working on a variable frequency drive and this repair was a hot rush – meaning that an entire line in a factory was down, the need to repair the drive quickly and efficiently was of utmost importance.
Once the drive was received into our repair laboratory we started working on it immediately by diagnosing the issues and ordering the parts.
Once the parts were installed the next thing to do was to power up the VFD (Variable Frequency Drive) to see if the new parts solved the issue. Once powered the bus was not charging, we determined that there must be something else wrong. After a full tear down of the drive our engineers drew schematics to work out how power was getting to the bus. We discovered the voltage was coming through a precharge resistor into the bus which once it was charged the SCRs (Silicon Controlled Rectifier) would fire and the voltage would be on the bus. The problem was we still had no voltage on the bus. Realizing that it was the precharge resistor that had blown we traced this back and found that although the connector looked functional in reality it was blown inside.
When we receive rental VFDs back at the end of a rental term, we thoroughly clean, inspect, and test them. The same inspections we perform could also be done for you when you receive a rental VFD on site.