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| 626 mill motor/inverter mods |
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| John Rudd:
Russ, The nvr is wired as supplied. I removed the wiring going to the original motor. The fed for the inverter is supplied by the terminals that fed the run winding of the original motor. The start winding wiring isnt used and the terminals are empty on the outgoing side. The interlocks are still wired in, ergo, if I lift the belt cover lid, the motor stops as it would originally. Not sure why the standby current would influence the operation of your nvr? :zap: |
| russ57:
I assumed it needs a minimum current to hold the relay closed, and the vfd when not powering the mill didn't draw that much. Perhaps there are nvr's and nvr's... -russ |
| appletree:
Hi The NVR function should be wired into the control side of the in vertex not interrupt the supply side of the inverter, it can take a bit of figuring out but that is the correct way to do it. Phil |
| John Rudd:
Phil, Could you explain why this is please? I've not read anything the documentation about having an nvr on the supply side....mcb yes.... |
| appletree:
Hi John It's not a good idea to remove the supply from the inverter when it is in full flow as it were, if you say opened a guard on a stationary machine arguably no different to switching off at the wall. However if the machine is under load removing the"drive" signal via the interlock switches rather than the contractor results in a controlled shutdown. The set perimeters operate correctly i.e. Dynamic braking etc and the energy in the electronics is dissipated correctly Hope this helps Phil |
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