Emerson Bettis 500 User Manual

Installation and Operation Manual
E2K-405-0218 Rev. 2 February 2018
39
Section 4: Operation
Operation
Two-Wire Control
The two-wire control mode uses only one contact to control the valve. When the contact
is closed, the valve opens, and when the contact is open, the valve closes. The contact
open and close status can be reversed in the “SETUP” mode. See Section 5.5.4, Discrete
Input Setup.
Three-Wire Control
The three-wire control mode uses two maintained contacts to open or close the valve.
This is an “inching” type mode. Remote seal-ins, “Momentary” mode, may be activated in
the “SETUP” mode. If the three-wire control is used with the seal-ins activated, the valve
cannot be stopped while being remotely controlled; the valve can only be stopped via the
inhibit or emergency stop inputs.
Four-Wire Control
The four-wire control mode uses three maintained contacts to open, close, or stop the
valve. The default conguration sets the stop input to be active on open contact.
The default conguration can be modied in the “SETUP” mode. See Section 5.5.4,
Discrete Input Setup.

Emerson Bettis 500 Specifications

General

Brand	Emerson
Model	Bettis 500
Category	Controller
Language	English