SMAR FY301, Instruction, Operations & Maintenance Manual

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FY301 – Operation, Maintenance and Instructions Manual
5.4
ATTENTION
The circuit boards have CMOS components that can be damaged by electrostatic discharges. Verify the correct
procedures to manipulate CMOS components. Also it is recommended to store the circuit boards in packs with
electrostatic load proof.
Release the two screws (
3
) that fix the main board circuit and the indicator. Pull out the indicator, then
the main board (
5
).
Verify the firmware version; must be version 2.12, 2.13 or higher. Mount the equipment; apply pressure
supply of 30 PSI and power on the equipment. If the equipment does not initialize and the display does
not light on, proceed to the following steps:
1. Disconnect the analog board from the digital board (
17
);
2. Case the equipment initializes, replace the analog circuit board (
18
- part number 400-0060)
or the analog circuit board for pressure sensors, if this replacement does not solve the
problem, it is necessary to replace the main circuit board (
5
- part number 209-0320).
Perform the auto-setup. After the setup, verify if the positioner is working properly. For that, apply 12mA
input and be sure that the valve goes to the position correspondent to the 50% travel. If it does not
occur, do the following:
1. Connect the Smar configurator to the input electric wires; select "Monitoring" option on the menu
screen;
2. Apply 4 mA and verify through the configurator if SP% is equal to 0%;
3. Apply 20 mA and verify through the configurator if SP% is equal to 100%;
4. If the values above were different, execute the 4 mA and 20 mA current trim;
5. Verify the Hall position sensor reading through the configurator. Apply pressure directly to the valve
actuator and verify if there is change in the Hall position sensor reading (
18
- part number 400-
0840), (65000 means that the position sensor is not being read) and the defect can be at the analog
circuit board or analog circuit board for pressure sensors (
18
- part number 400-0060) or the
position sensor set (
35
- part number 400-0090); replace the boards and perform the step 2 through
step 4 again;
6. Verify the piezo voltage at the configurator;
7. The piezo voltage value must be between 30 and 70 Volts.
To verify the Hall position sensor value and the piezo voltage, do the following:
1. Set the valve in 50% travel;
2. With the configurator, go to the “monitoring” mode and choose two parameters: Hall value and
piezo voltage;
3. The piezo voltage values must be the most closed possible to 26000 to 38000;
4. The piezo voltage values must be between 30 and 70 Volts. If the voltage is not between these
values, proceed with the piezo calibration by using the FYCAL calibration device (check at
www.smar.com for more details on the FYCAL).
Preventive Maintenance for the Positioner
Planned Maintenance, consists in the set of procedures and anticipated actions to keep the device
functioning, is effectuate with the special objective to prevent the occurrence of fail. Through
adjustments, proves and measures according to the specified values, made before the appearing of
defects. The preventive maintenance is recommended in the maximum period of one year, or when the
process stops.
Disassembly Procedure
Voltage to Pressure Transducer
To remove the transducer from the electronic housing, the electrical connections (in the field terminal
side) and the main board connector must be disconnected.
Loosen the hex screw (
6
) and carefully unscrew the electronic housing from the transducer, observing
that the flat cable is not excessively twisted.