[Elecraft] KPA1500 and KPA500 set up question

[Earl]

Received my new KPA1500 yesterday ordered early March. Yea!!

Presently I have the K3/KPA500/KAT500 in line with the AUX Cable connected to 
a N6TV Y-BOX.

I now have the KPA1500 connected to the Y-BOX also. All looks good.

Presently the KPA500 powers on when the K3 is turned on.

Is there a setting, that I can't find, to not have the KPA500 turn on 
automatically.

I have looked through both config menus and manuals also Fred Cady's book for 
the K3.

Thanks in advance,

Earl  N5ZM..