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Variable frequency drive on refrigeration compressor

Variable Frequency Drives- Wiring diagrams - Electric
www-tips››ActivitiesJun 05, 2010Variable Frequency Drives- Wiring diagrams paliha (Electrical) (OP) 1 Jun 10 08:17. I have a problem with selecting between available variable speed dive wiring diagrams especially the location of the main contactor, as indicated below, 1) No contactor- drive is between the feeder MCCB and the motor. This is the simplest.Capacitors are charging discharging six times a cycle when the drive is energized. The contactor ahead of the drive is the safest. Our drive gurus will report any possible issues with the contactor between the drive and the motor. Bill -------------------- "Why not the best?" Jimmy CarterSome VFDs do not like driving into an open circuit. You need to talk to specific vendors if their drive is suitable or not. My preference is to put the contactor at the input to the VFD and an interlocked isolator adjacent to the motor.Why do you feel the need for a contactor at all? If it has to be there, how would you intend on using it? "If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips Forum PoliciesIf the contactor is there to provide an emergency stop then use a no-volt release or a shunt trip into the MCCB. Some drives have a 'secure disable' function (can't remember whose trademark that is..) which is a high inegrity means of killing the drive output in response to a safety input. Some are qualified to the EN954 Cat 4 machine safety standard which is not easily met. Personally I'd choose the NVR in the breaker to kill the drive in an emergency because it will fail safe and will quickly clear a downstream fault regardless of what it is, but it would be foolish to disregard the effort the drives guys have put into meeting some tough requirements. ---------------------------------- If we learn from our mistakes I'm getting a great education!If you put the contactor between the VFD and Motor then you will potentially have two issues: 1) If the VFD is running and you open the contactor then most VFD's will register this as an error. An error may indicate that you have 'lost the motor' or it is indicating 'no-load' or something. The VFD may alarm or even trip; either way it is not a good thing to happen. 2) If the VFD is already running and the contactor is open (assuming it hasn't tripped), then closing a contactor into a VFD that 'thinks' it is running a motor will either cause the VFD to go into current limit (the motor will in effect be looking to start DOL or it will trip the drive on overcurrent). Worst case scenario is that there could be severe damage to the VFD due to the nature of high voltage transients when a contactor is closing. This could destroy certain VFD's. All in all, not recommended for a contactor between the VFD and Motor unless you have some aux contact into a 'coast stop' on the VFD or other means to bring the VFD to an immediate stop if the contactor is opened and (preferably) a timer if bringing the run command after closing. Some VFD's have built in isolators in the drive itself. They will isolate power to the VFd and can be locked off if security of maintenance is required.As for the line side, you have to make sure the VFD powers down before re-applying power. It's not a good thing to de-energize the line power input and then re-energize it while the VFD still has the pre-charge circuit closed. This will create a large current surge that can damage parts. If you "must" do it on the line side then use it as an emergency stop only or use a timer to ensure the drive has been powered off for a suitable period of time before re-closing.In respone to LoinelHutz, we have had this same exact problem he is describing. We were using contactors on the line side of our drives as part of a machine guard type safety circuit. Basically there were safety gates installed on our new line, through normal operations the operators would open the gate, dropping out the contactors on numberous drives. The operator could open and close the gates in a second or two if he wanted. Our drives were dropping like flies on our new line. We had the drive rep come out and scope everything determined that we need to put a timer on the contactors for say 10seconds or so, to eliminate this inrush current on the percharge circuit. We also installed line reactors between the drive and the contactor. We haven't had a failure since.1What you probably should do is properly design your safety circuit to require a re-start if anyone opens the door! The fact that they can open and close it so fast and have an automatic restart is inherently dangerous to my mind. It's an accident waiting to happen. "If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips Forum PoliciesThe best way I have seen is the contactor on the output of the drive that is emergency stop enabled. The same enable signal is given to the drive for enable signal. So during emergency stop the enable is taken from the drive first, then at same time the contactor is opened. During normal stop this same contactor is opened after a off delay. The off delay signal comes from the PLC estop enable. The off delay time is typical of the ramp down of the drive and a little more. When the start button is pushed the contactor is pulled in and the vfd drive is turned on.jreaf, I left out alot of details to make the point about the electrical problem. These gates are designed with a solenoid that prohibits you to open the gate if all of the interlocks aren't in order. You then have to press a pushbutton to unlock and to relock the gates, again providing all of the interlocks are in order. These are specially designed 2 channel safety switches wired into safety relays.VFD's for home AC use. - Electric motors & generatorsJul 31, 2012Delta 3 Phase and VFD problems - Electric motorsNov 22, 2006See more results
VFD wiring - VFD - Variable Frequency Drives
VFD wiring. 1. Main circuit wiring Variable Frequency Drive Wire input to terminals L1, L2 and L3 for three phase input. Make sure to connect the ground terminal to an appropriate safety ground. VFD PWM Waveform The diagram below shows a common waveform for a pulse-width modulation (PWM) circuit in the VFD. The transistors in the PWM
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