SMAR IF302, Operation, Maintenance & Instruction Manual

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IF302 - Operation and Maintenance Instruction Manual
3.4
Figure 3.3 - Current Trim - IF302
WARNING
It is recommendable that a convenient engineering unit be chosen by means of parameter XD_SCALE of the
Analog Input Block, considering that the range limits of the sensor must be respected, these being 100% and
0%.
It is also recommendable, for every new calibration, to save existing trim data in parameters
CAL_POINT_LO_BACKUP and CAL_POINT_HI_BACKUP, by means of parameter BACKUP_RESTORE,
using option LAST_TRIM_BACKUP.
Via Local Adjustment
The
IF302
has 3 input transducers and its device leaves SMAR with factory settings. The factory
setting establishes only the transducers #1 as default for local adjustment. In order to configure the
others via local adjustment, the user should configure them in the display transducer via SYSCON,
according specific instructions for this transducer block.
In order to enter the local adjustment mode, place the magnetic tool in orifice “Z” until flag “MD”
lights up in the display. Remove the magnetic tool from “Z” and place it in orifice “S” until the
message “LOC ADJ” is displayed. The message will be displayed during approximately 5 seconds
after the user removes the magnetic tool from “S”. By placing the magnetic tool the user will be able
to access the local adjustment tree in the monitoring mode.
Browse to parameter P_VAL (PRIMARY_VALUE).
Supply 4.0mA or the lower value to the terminal block and wait until the read of the parameter
stabilizes in the display.
Browse to parameter “LOWER”. After that, in order to start calibration, the user will act on the
parameter “LOWER” by placing the magnetic tool in “S” down to 4.0 mA.
Let’s take the upper value:
Supply 20.0mA or the upper value to the terminal block and wait until the readout of parameter
P_VAL stabilizes, and then actuate parameter UPPER up to 20.0.
Trim mode exits via local adjustment automatically when the magnetic tool is not used during
approximately 16 seconds.
NOTE
Keep in mind that even when parameters LOWER or UPPER present the desired value, they must be actuated
so that calibration is performed.
This parameter
indicates where the
converter should be
when the setpoint is
100%. The desired value
should be entered.