[Elecraft] K3, KPA500, KAT500 interactiions

[Bill Wiehe]

I must be having a senior moment so bear with me. If the KPA500 is "not keyed" (K6KR) and/or it is "inhibited" (AC7AC) while the KAT500 is tuning, why am I getting a "fault" that requires a manual reset?
BTW I am using the cabling as described in figure 1 on page 4 in the KAT500 owners manual with the correct DB15 cables and, in the interest of full disclosure, I do use the KPAK3AUX Y cable at the K3 ACC port.
Bill - W0BBI