SMAR fy303, Operation, Maintenance & Instruction Manual

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Section 4
4.1
MAINTENANCE PROCEDURES
General
FY303 Profibus to Valve Positioners are extensively tested and inspected before delivery to the end
user. Nevertheless, during their design and development, consideration was given to the possibility
of repairs by the end user, if necessary.
In general, it is recommended that the end user do not try to repair printed circuit boards. Instead,
he should have spare circuit boards, which may be ordered from Smar whenever necessary.
DIAGNOSTICS
SYMPTOM PROBABLE ERROR SOURCE
POSITION
SHOWN ON DISPLAY
Positioner Connections
Check wiring polarity and continuity.
Power Supply
Check the minimum voltage signal equal 9 Volts.
Electronics Failure
Check circuit boards for bad connections and replace them for spare boards.
NO
COMMUNICATION
Network Connection
Check network connections: equipment, power supply, couplers, links, and terminators.
Network Impedance
Check network impedance (power supply and terminators impedance).
Positioner Configuration
Check the configuration of the positioner communication parameters.
Network Configuration
Check the network communication configuration.
Electronics Failure
Try spare parts in the positioner circuits.
NO RESPONSE
TO INPUT SIGNAL
Pressure Output Connections
Check up on air leaks.
Air Supply Pressure
Check the air supply pressure. The input pressure to FY303 shall be between 20 psi and
100 psi.
Calibration
Check the positioner calibration points.
Obstructed Restriction and/or Blocked Output
Observe the following procedures described in this Manual: OUTPUT CONNECTIONS
and RESTRICTION CLEANING.
OSCILLATING
ACTUATOR
Calibration
Adjust parameter Kp.
Adjust parameter Tr.
SLOW ACTUATOR
RESPONSE
Adjustment Parameters are Too Low
Adjust parameter Kp.
TOO FAST ACTUATOR
RESPONSE
Adjustment Parameters are Too High
Adjust parameter Kp.
Table 4.1 - FY303 Diagnostics
If the problem is not presented in the table above follow the Note below: