February 2022
Installation, Operation and Maintenance Manual
VCIOM-15345-EN Rev. 1
28
Start-up Procedure
Section 4: Start-up Procedure
!
WARNING
The Pressure Unit and Pressure Spike During Hydraulic Stroke is factory set based on
valve torque and safety factor provided. These parameters do not need to be adjusted
during commissioning.
4.7.4
Once the Self-Calibration settings have been confirmed, Self-Calibration can now
begin. The LCD Display will display [S][c] to designate Self-Calibration is ready to
begin. Toggle the NO/YES Selector Switch to YES to start Self-Calibration. Toggle
the NO/YES Selector Switch to NO to cancel Self-Calibration.
4.7.5
Once Self-Calibration starts, the Biffi EHO will stroke the valve based on the
Self-Calibration Cycle Count and set the open and close limits based on the
pressure limits set by the Pressure Spike During Hydraulic Stroke and Maximum
Operating Pressure set. During Self-Calibration, the LCD Display will show [C][a]
to indicate the Biffi EHO is calibrating the open and close limits.
4.7.6
Once Self-Calibration is complete, the LCD Display will show either [S][F] to
indicate Self-Calibration Failed or [S][P] to indicate Self-Calibration Passed.
NOTICE
If Self-Calibration fails, check for any alarms displayed on the LCD display. If any alarms
are displayed, correct each alarm before starting Self-Calibration again. See Section 8.5.
Alarms for the list of alarms and the causes of the alarms. If the Self-Calibration continues
to fail with no alarms active, please contact an Emerson representative.
4.8
Limit Switch Adjustment (Optional)
NOTICE
Kindly remove the weather protection Loctite SI 5366 (or equivalent transparent silicon
base product) from the holes with a screw to proceed with the cap removal procedure
quickly. After the activity, remember to refill the product.
If limit switches are supplied with the Biffi EHO, the limit switches will be factory set.
The purpose of the limit switches are for position feedback and further adjustment of the
limit switches are typically not required.
4.8.1
To complete limit switch adjustment, the actuator will need to be stroked from
a fully closed position to a fully open position etc. several times. In the following
instructions, the electric motor is used to Power Stroke the actuator. If it is not
safe or possible to use the electric motor at this time, use the Handpump to
Power Stroke the actuator.
4.8.2
The limit switch adjustments are found in a covered compartment in line with the
valve stem and on the opposite side of the control box. Remove the limit switch
compartment cover by loosening the four corner bolts retaining it. All covers have
tapped holes for jackscrews to aid in removing the cover. Use the retaining screws
in these holes to lift the cover evenly at each corner. Use caution to not allow the
cover to bind during removal.
