Excessive Torque For Valve Operation; The Actuator Does Not Stop In Fully Open Or Fully Closed Position; Diagnostic Led - Emerson Keystone EPI2 63 Installation, Operation And Maintenance Manual

Installation, Operation and Maintenance Manual
MAN-10-04-100-0711-EN Rev. 0
7.2.7

Excessive Torque for Valve Operation

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•
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7.2.8 The Actuator does not Stop in Fully Open or
Fully Closed Position
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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.
Number of blinks of the diagnostic LED
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.
Maintenance and Troubleshooting
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
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)
1x
2x
3x
4x
5x
6x
7x
8x
9x
10x
11x
Section 7: Maintenance and Troubleshooting
Description
Actuator in intermediate position (NO ALARM)
Actuator on CLOSE limit (NO ALARM)
Actuator on OPEN limit (NO ALARM)
Under-voltage warning on Internal secondary voltage
Sensor alarm (no SPI communication)
High temperature alarm
Bad CRC alarm
Motor over-current alarm
Stroke limit alarm
Jammed alarm
High Torque alarm
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