*! PlEASE NOTE !* If you have installed a foot pedal and do not have an ATC there is an element of danger where one can release a tool while the spindle is turning. One might say "I just won't step on it" but things can and do happen. I can attest to the fact the tool can be released by this behavior.
Following is a simple low, low cost fix. Courtesy of David A. from Idaho Tormach Users Group (ITUG). The ATC comes with an additional cable (VFD interconnect cable) with an RJ-11 plug which plugs into the last unmarked position in the photo provided earlier in this topic and on (page 8) of the ATC User manual
Direct Document and Software Download | Tormach Inc. providers of personal small CNC machines, CNC tooling, and many more CNC items. The other end of this cable connects to the VFD as shown on (page 11) of the ATC User manual. Connecting this additional cable inhibits the Foot pedal or Push button from activating the Power Draw Bar (PDB) while the spindle is turning. I have urged Tormach to include this cable with instructions when selling the foot pedal.