Had occasion to pick up a nice trick for Linx. After a sudden disappearance of a certain PLC, which had been showing in RS Who, a customer support engineer suggested I remove two files in the C:\Program Files\Rockwell Software\RSCOMMON directory. They are both named Harmony, one extension .hrc...
I believe that the tables to which you refer are based on full voltage starting with the attendant high currents/heating of that starting method. The VF drive should be able to operate the motor at 100% torque throughout the acceleration period with much lower heating than full voltage starting...
With at deadband of 30 you tell the pid to take no action until the error > 30.
Simple fix is to compare the PV/SP for this condition and when it exists momentarily force the PID instruction to manual and over write the output register with zero. Make sure to position your logic so that it...
Wye-Delta starting is primarily used to start high inertia loads. A loaded wood shredder would probably qualify.. Problem is that the motor torque is reduced to 1/3 of locked rotor torque when compared to direct on-line start. If the load torque requirement exceeds this value then you have a...
Given a low voltage cable rated at 600VAC, what would be the maximum allowable DC voltage on which the cable could operate and remain within its design withstand, 600VDC or 850VDC? My question comes from a VFD commom bus application where two drive DC buses are interconnected. A 480VAC VF drive...
I need to supply a speed reference (4-20MA) to a vfd from two separate plc systems (4-20 ma outputs) for redundancy. Would prefer to have no user input required to make the selection. Considered using a high-select analog module but this would require a separate loop supply which is...
The standard method to change direction on a six lead motor is to interchange two of the three phases. With six leads, you have to do it in two places. You would interchange T1-T2 and T6-T4. This will give you the result you seek.
