SVI-II Instruc Man.book - Fagerberg

Masoneilan Dresser
SVI II AP Instruction Manual
Adjusting I/P Zero
The I/P Zero is calibrated at the factory prior to shipment. If there is a problem
with I/P zero please contact your Masoneilan representative.
Connecting Components to the Electronics Module
If it is necessary to remove and install any SVI II AP component you may need
to reconnect the component to the SVI II AP Electronics Module via the SVI II
AP Terminal Board. Refer to “Making Connections to the Terminal Board” on
page 35 of this manual for instructions.
Repair by
Replacement
Using ValVue 2.4 and repair-by-replacement is the fastest method to service
an SVI II AP. See the ValVue 2.4 instruction manual for details regarding
uploading and downloading configuration files. Upload all configuration
information from the installed positioner to ValVue 2.4, then install the
replacement positioner and download the configuration file into the
replacement unit. Run STOPS, and autoTUNE, and the repair is complete.
The positioner that was removed can be refurbished and reused.
Substitution of components can void safety approvals
Internal
Diagnostics
The SVI II AP performs internal self-diagnostics and hardware checks. When
ValVue 2.4 or HART Handheld or the local display indicates that there are
error messages write them down for troubleshooting.
FAILSAFE Mode
Several of the internal diagnostics tests puts the SVI II AP into FAILSAFE
mode if the errors continue for a preset time. When the SVI II AP goes into
FAILSAFE, the valve will be driven to its Failsafe position. It remains in that
position until a technician clears the cause of the error and resets the
instrument. Reset is performed in two ways. Connect a HART modem and
ValVue 2.4, and then click on the RESET button or turn the power off and on.
To prevent the valve from moving after reset, put the controller in manual, and
set the valve position setpoint to the failsafe position 0% if ATO, 100% if ATC.
The user can set a special case of FAILSAFE. The user may set a Position
Error Band and a Position Error Time 2 that forces the valve to its failsafe
position if the position error exceeds the band for a time longer than time 2.
This can be used on critical loops to force the process to trip if the positioner is
unable to control the valve.
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