The typical fan array runs all the fans at the same speed and provide even flow through the array and across the cooling coil. However, there are AHU OEMs who have designs where they’ve evaluated the entire wire-to-air system efficiency of the fan, motor, cooling coil, and VFD - and have identified the optimal operating points for the system. For example, at a particular operating point of a 2x2 array, it may be more efficient to run (3) fans at a higher speed, than run (4) fans at a lower speed. These “sweet spot” efficiency points are determined by the AHU OEM based on their testing and calculations. The logic for that staging control would be part of their equipment mounted supplied controls. Being able to run the motors over 60 Hz with the VFD, allows additional flexibility for such designs.

Thanks

Please reach out to your local ABB representative regarding who has access to the tool and if/how you can receive a copy.

did you ever get the simulator i am a apprentice and want to learn more about vsd's ect.

I agree with those (5) drive techs. I mentioned 18-pulse for awareness of the technology, as there is an install base of them out there, but I never recommend them for new installations. With an 18-pulse, it essentially rectifies (9) phases to make the DC bus, instead of the typical (3) phases. Even though many expect the voltage drop across the phase shifting transformer, and additional/balancing reactor, to result in a lower DC bus... with 18-pulse we end up seeing a bit higher DC bus with the rectification of (9) phases instead of (3). Had they let you power it down to troubleshoot, and assuming the jobsite's 480V power wasn't low, the first thing I'd be looking at is those (9) phases after the transformer. Other than the obvious voltage magnitude test points between input and DC bus, I'd also be casting a critical eye on the performance of those (9) phases. Each was likely fused, check the (9) fuses to see if any were open. After the fuses, I'd check the 18 diodes, were any of those bad/open. When in doubt, current is the great equalizer of troubleshooting - check for balanced current across the (9) phases. (Some of those tests are easier to do than others - from a safety aspect, I'd have started with the fuses and diode check as those are power down tests). Complexity of troubleshooting - another reason I personally don't like 18-pulse:)

We’re happy to hear you found the video helpful. Regarding your experience with our technical support, thank you for your feedback and for sharing your experience. At ABB we strive to provide excellent support to all our customers, and we're sorry that we fell short of your expectations in this instance. Your feedback is valuable to us, and we use feedback like yours to improve our support services. As an example that is directly tied to your scenario, our Technical Support is based out of our Wisconsin factory, while the 18-pulse are manufactured at a different US-based facility. We previously identified that our Wisconsin team didn’t have timely access to 18-pulse as-built drawings, thus our responses were not as timely as we expect. As a result, we’ve since made improvements to processes that allow that data available to be more readily available. If you have any further questions or need assistance, please don't hesitate to reach out to us.

This is a percentage of the fault level/threshold. Reaching a value of 100% would result in the drive faulting to protect itself.

@@TimSkell ​ thank you sir, that percentage really confuse me. But is there any way to know the precise temperature of the IGBT? not in percentage

Please reach out to your local ABB representative regarding who has access to the tool and if/how you can receive a copy.

There could be a host of different things causing this fault. I suggest giving a call to our Tech Support team @ 1-800-752-0696. They are open 365 days a year all hours.

A differential voltage probe was used. There is no true “ground” side of a differential voltage probe that must be connected to earth ground. The “negative” side of the differential probe was connected to the negative DC bus of the drive. You are correct that many small HP drives do not have easy access to the DC bus. The ACH580-01 series drives R1 - R3 frame do not have access to the negative side of the DC bus by the power terminals, but do have access to recessed test point eye loop located above the control board (R1 and R2 frame) or to the left of the control board (R3 frame). If you did connect the differential voltage probes “backwards” across the DC bus, most oscilloscopes provide an option to invert or flip the signals on the channel.

Yes the process is the same for the ACS550

Unfortunately that is not possible. The hardware components, mainly power devices of the 9 KW drive are not the same as the 37 KW drive. A larger drive would need to be purchased.

ABB Drives service workshop located in New Berlin, WI

Welcome 👍

Is drive composer compatible with all AC and DC drives or just with some specific ones?

@@MrMadridoo23 great question. The Drive Composer Basic and Pro are designed for the drive families who are part of the “All Compatible Portfolio “ which includes ACS380, ACS480, ACS/Q/H580, ACS880 and DCS880. There is limited connectivity to some of the previous generation drives but for upgrade purposes not so much standard day to day parameterization.

@@ras5056 Great ... let me ask the question differently to be more precise, is drive composer (entry or pro) compatible with DCS 600, DCS 800, ACS 600 and ACS 6000 ?

@@MrMadridoo23 No. Only the newer All Compatible Drives along with the older ACS800 drives. I believe the ACS600 used same DriveWindow as the ACS800 series, via fibre optic connection; which happens to still be available. The DCS600/800 DC Drives can also use Drive Window or Drive Window Light. The new DCS880 series is the new "All Compatible" DC Drive being sold today which also uses Drive Composer (Pro).

@@billboto7 Very good 👌 thank you for your response. What's the meaning of Q and H in ACQ and ACH ?