1) If the NCU has its own power supply, then the drives still have no power.- If possible, switch on the power supply for the drives at the same time as the NCU.
2) If the NCU and the drives have the same power supply then not even the first module
could be recognized. Check whether the red LED on the first drive module is illuminated.
If this is not the case, then usually the module does not have any power.
- Check the connections of the ribbon cable running from your I/RF or monitoring unit to
the module.
- If after switching on the I/RF or monitoring unit, no LED of a module which is connected
to it is illuminated, then check the I/RF or monitoring unit and, if required, replace the ribbon cable.
3) Check whether all drive bus connectors have correctly snapped into place and that the bus terminator is connected.
4) If you have not been able to detect an error by now, the module is defective.- Replace the module