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I have only one contact available for starting and stopping the drive - should I use run or start or coast stop?

The best way is to permanently tie run and coast stop to 24V and use your contact to switch the start input, terminal 33. Under these circumstances the drive has control over the contactor, ramp to stop time etc. It is definitely not a good idea to tie the three inputs together and use one contact for all three, for example.

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