On Nov 13, 2013, at 6:04 AM, "Adam Molny" <Adam@ValidationPartners.com> wrote:

Paul -
The gear relays are activated by applying a small current to the relay coil
terminals. That pulls the main contacts closed against a strong spring. When
you remove power the spring pulls the main contacts apart. There is a known
failure mode where the main contacts weld themselves together. When that
happens the relay will remain in the "on" state regardless of what the
pressure switches are doing. -Adam
-----Original Message-----
From: Paul Miller [mailto:pjdmiller@gmail.com] Adam, I don't understand how this happens unless the pressure switches on
the pump aren't shutting down.

Paul


--
For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html