Z probe settings

Hi all, I'm having a nightmare setting up mach 3 Auto tool zero. I had a hard drive failure but managed to save the mach 3 folder. I have now reinstalled this to my new drive but when the probe makes contact with the plate, it thinks it's a limit switch and e stops the machine. Have been trying different settings but no joy. Any help appreciated
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Did you manage to sort this out Clive ?

Yes I did, thank you.