Connections To Flow Computers; Omni - Honeywell Enraf Operation Manual

Electrical Schematics & Drawings

6.2 Connections to Flow Computers

Shown below are diagrams showing how to connect the SVP Controller
via the Customer Connection Box to various models of flow computers.
Note that the first diagram shows a simplified representation of the
Run Permissive Input and the Volume Pulse Output circuits in the SVP
Controller. The 1500 ohm current limiting resistor shown in the diagrams
is required with operating voltages from 12 to 24 volts DC. For operating
voltages from 6 up to 12 volts, the 1500 ohm resistor must be replaced
with a zero ohm jumper. The resistor and jumper must be connected to the
terminals in the Customer Connection Box.

6.2.1 Omni

An Omni flow computer requires that the meter be connected to one of
the two E Combo card pulse inputs. The E combo card will use the double
chronometry proving method. Although there are other ways to make the
connections, we will describe the connections according to the diagram
below. The Volume Pulse + (terminal 16 of the Customer Connection
Box) connects to the prover detector input of the E Combo Module. The
prover detector input on the Omni is usually Pin #7. Connect Volume
Pulse – (terminal 17 of the Customer Connection Box) to common on
the rear of the Omni. This is usually Pin #10 which is tied to common on
the power supply. The prover Run permissive + command (terminal 13 of
the Customer Connection Box) connects to any Omni Digital I/O point.
That point must be assigned a Boolean point that has been programmed
with the value of/1927. Then the Digital I/O point must be assigned the
Boolean point.
Example: Program the Boolean point 1025 with the statement/1927.
Then program Digital I/O point #12 with the number 1025. Connect the run
command wire to Digital Point # 12.
A 1500 ohm resistor must be installed between the Run permissive -
(terminal 14 of the Customer Connection Box) and the common (terminal
15) for the run command to work properly. This setup will launch the
prover when the I/O point goes high (voltage applied). When it is low
(no voltage) the prover motor will be idle. A jumper must be connected
between the Volume Pulse – (terminal 17 of the Customer Connection Box)
and the Common (terminal 15 of the Customer Connection Box). Please
read the Omni's Operator's manual prior to connection and or operation of
the Honeywell Enraf small volume prover.
6-4 SVP Controller Operation Manual Part No.: 44200004 - Revision 2