Hi all
On a hydro power generation project under construction we have two generators connecting to the power system by a single three winding transformer. The step up transformer consists of three single phase units each with two 13.8kV secondary windings. Our expectation is that the overall...
I think you should be able to set a constant current using a pointer. PT100 resistance at 130DegC is about 150 ohms. So 3xPT100 I think you'll have to set the current at 20mA, which will give 9V on the analog input. A simple y=mx+c conversion can be programmed in DriveAp to calculate the...
Hi Martinrelayer
I thought about it over the weekend and what I'm suggesting won't work as you need a constant current source to supply the PT100's. The ACS800 uses an analog output as a constant current source and then reads the voltage required to drive the current through the variable...
The ACS800 has three analog inputs. As long as you are not using the one of them as your speed reference you could connect PT100's from one of you motors to the spare input and use the DriveAp to do a compare of the measured voltage drop across the PT100's.
You will have to do some...
It should work, according to the Datakom AVR8 product specification it only needs 4VAC residual voltage on the stator start. The sense and power inputs are rated for full line to neutral voltage so you can connect them to the stator winding ends and not half way down the winding as the stamford is.
The 505 is a very nice reliable and robust turbine governor, but that is all it does, govern the speed/power output of the turbine. It doesn't have any built in data recording systems. To get all the information out of it that you probably want you will have to communicate to it using the...
NZ and Aus use the same standard, and every hotel or motel I've stayed in (including Aus) the room has had a small DB usually just inside the entrance flush mounted on the wall. The main reason for one DB per room is the the DB has an RCBO as the main switch, and has the master room contactor...
The usual issue with retaining WRIM is can they handle the voltage spikes in the output waveform of the VSD. It is normal practice to put a sine filter on the output of the VSD, which adds cost to the project, and you're still left with your old motors that you think are on there way out any...
They have the same type of drives on the tower fans and they have been "great". It would be interesting to do a comparison to see if the tower fan drives have had the internal EMC filters disconnected. It seems odd that these drives should fail regularly and others on site of the same type do...
The 723 being a digital electronic governor is unlikely to be the cause of your problems, but stranger things have happened. First you need to do the usual fault finding of controls external to the governor.
Check the mag-pick up for signal quality, you may have two pick ups so check both of...
As I said every is clear in hindsight, but when the VSD supplier says don't worry that the AMA failed "its because the motor as a power factor that is outside of the range expected by the VSD's motor model" you tend to go and focus on something else.
Just one of those things to keep in the back...
Thanks for all your suggestions. As often seems to be the way the solution is perhaps obvious in hind site. The very muted feedback from the site is the motor was star connected instead of delta. This may explain why the VSD failed to complete the Automatic Motor Adaption and not just because...
A little bit more info.
When the VSD is set to 50Hz it only reaches 48.7Hz and current is 80Amp. This would indicate that the VSD is limiting its output for self preservation purposes. I don't know the drive set up, but if it is set for V/Hz operation rather than vector control would that be...
Hello all,
Do you have any experience of running low speed (365rpm, 16 pole) motors with low power factor (0.56 @ 100% load, to 0.38 @ 50% load) on a VSD. In this instance the motor is 25kW with rated current of 80Amp. The VSD has been sized to the motor rated current not the motor kW, hence...
