VSD Com Fault
VSD Com Fault
(OP)
Good morning all,
First Merry Christmas, We are working on 200hp Compressor with a VSD. The Display has been logging VSD Com Faults. We had found two broken last night and corrected. The unit is manufactured by Cutler Hammer and the compressor is a Sullair. This morning we come in to the same thing. All of the wire check out good and all of the boards have been removed and reseated. Just was wondering if any one has seen this before. This is my first experience with VSD and need some help. On where to go and what to check. We have only begun communicating the manufacture but as you know, they are not moving as fast as I need them to.
Please help and Thank you
2571
First Merry Christmas, We are working on 200hp Compressor with a VSD. The Display has been logging VSD Com Faults. We had found two broken last night and corrected. The unit is manufactured by Cutler Hammer and the compressor is a Sullair. This morning we come in to the same thing. All of the wire check out good and all of the boards have been removed and reseated. Just was wondering if any one has seen this before. This is my first experience with VSD and need some help. On where to go and what to check. We have only begun communicating the manufacture but as you know, they are not moving as fast as I need them to.
Please help and Thank you
2571





RE: VSD Com Fault
2571
RE: VSD Com Fault
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: VSD Com Fault
RE: VSD Com Fault
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: VSD Com Fault
RE: VSD Com Fault
2571
RE: VSD Com Fault
Sounds OK.
Are the two units bonded? They should be. Having a protective earth running from ground to each unit is sometimes not enough. Heavy EMI at high frequencies are generated by the inverters.
Do you really supply the I/O with 27 V AC? Sounds rather high. Even 22 V AC is high since the AC is rectified and smoothed and will produce around 30 V DC.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: VSD Com Fault
RE: VSD Com Fault
What type of communications are you talking about? Serial port, Modbus, discrete I/O?
RE: VSD Com Fault
Correcting the voltage to the I/O module has thus far corrected our problem, when we arrived on Saturday the unit in question was logging error just sitting there. We disconnected power and re-tapped the Trans to H1 and H5 giving us a lower voltage on the secondary. This provided a lower voltage to the module between the 22 and 24 volts the manufacture want and we have had no error. Unit has been setting in stand by all weekend with no errors. Prior to the change it was logging errors at least every 5 minutes or so. Now I have created a second thread for AC to DC converters so I can create a more reliable voltage because our line will drop during the hot summer month and I am sure I will be looking at the low side then.
2571