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We were having a tinker today, and I think it is most likely a fault with the handset cable (or possibly the handset, or the motors / motor controllers).
We've now had two occasion when on first power up it starts to go through it's initialisation dance, but as soon as you start the alignment procedure, or try to manually drive it, we get the "Motor fault" message. After that, no amount of power down, power up, disconnect / reconnect the cable, etc, seems to clear the fault. (But sometimes disconnecting the handset cable and reconnecting it results in no power at all to the handset, which points to a possible fault with the handset cable and / or end connectors at either the motor drive base end or the handset end?) We haven't yet managed to get it under manual or automatic control at all.
I found a 12V power pack with a suitable end jack which powered it up fine, but it generated the same "Motor Fault" error message as running on batteries, which suggests it probably isn't a power supply problem.
Oh well - we'll get in touch with the local supplier, and see if they can diagnose it and fix it. First thing would probably be to try a new cable and / or handset, to see if that fixes it; if not, it sounds suspiciously like a fault in the motor-drive base, which will be a major pain, because presumably that would need to go back to the factory to fix.
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