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Service Instructions
MAN-02-08-77-0714-EN Rev. 2
4.7.1
4.7.2
4.7.3
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
4.7.5
4.7.6
NOTE:
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.
Set-up/Start-up Procedure
To start Self-Calibration, the SMART EHO must be in the setup menu. Refer
to Section 8.1 Entering the Setup Menu and Section 8.2 Change Settings for
instructions on how to enter the setup menu, enter the passcode, and navigate the
setup menu.
Navigate the setup menu until [S][C] appears on the LCD display. [S][C] is the
Menu Key for Self-Calibration. Toggle the NO/YES Selector Switch to Yes to enter
self-calibration.
Prior to starting Self-Calibration, the SMART EHO has the following Self-Calibration
settings that must be confirmed first:
4.7.3.1 Self-Calibration Cycle Count [S][t] – Set the number of full cycles for the
SMART EHO to cycle during self-calibration. One cycle is defined as one
open and one close stroke. The parameter can be set to 3 to 5. 3 is the
default setting.
4.7.3.2 Pressure Unit [P][u] – Set the pressure unit for the SMART EHO. The
parameter can be set to 0(psi), 1(bar), 2(kP). 0(psi) is the default setting.
This parameter is factory set.
4.7.3.3 Pressure Spike During Hydraulic Stroke [P][S] – Set the maximum
hydraulic pressure of the SMART EHO during self-calibration. This setting
is only for motor-based SMART EHO's. Depending on the Pressure Units
set in 4.7.3.2, this parameter can vary in its display:
10 - 50 (psi - in multiples of 100)
7 to 35 (bar - in multiples of 10)
7 to 35 (kPa - in multiples of 1000)
This parameter is factory set.
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.
Once Self-Calibration starts, the SMART 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 SMART EHO is calibrating the open and close limits.
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.
Section 4: Set-up/Start-up Procedure
September 2020
31
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