Installation, Operation and Maintenance Manual
MAN-10-04-100-0711-EN Rev. 0
October 2020
43
Maintenance and Troubleshooting
Section 7: Maintenance and Troubleshooting
7.2.7 Excessive Torque for Valve Operation
• Clean, lubricate and check the valve stem
• Valve packing too tight: loosen the gland bolt nuts
• Check that the internal valve trim or the reducer gears are well lubricated
and not damaged
7.2.8 The Actuator does not Stop in Fully Open or
Fully Closed Position
• Check that the actual open and close positions of the valve respectively
correspond to 100% and 0%
• Make sure that the torque and travel limits are correctly set (see Chapter 6)
7.2.9 Diagnostic LED
For more detailed alarms, check the diagnostic led status (on the logic board).
It has the coding shown in the table:
Table 7.
Sensor Alarm (5x blinks of the diagnostic led).
Check that the position sensor cable is connected.
Check that the position sensor enclosure is not mechanically damaged.
If it is broken, replace the entire electronic group.
Bad CRC Alarm (7x blinks of the diagnostic led).
Restart the power supply: turn off and turn on the actuator.
Number of blinks of the diagnostic LED Description
1x Actuator in intermediate position (NO ALARM)
2x Actuator on CLOSE limit (NO ALARM)
3x Actuator on OPEN limit (NO ALARM)
4x Under-voltage warning on Internal secondary voltage
5x Sensor alarm (no SPI communication)
6x High temperature alarm
7x Bad CRC alarm
8x Motor over-current alarm
9x Stroke limit alarm
10x Jammed alarm
11x High Torque alarm
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