Limitorque
®
MX Electronic Actuator FCD LMENIM2306-09-AQ – 08/17
89
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NOTE: To free a jammed valve from the “CLOSE” or “OPEN” position, engage manual override and attempt to unseat it
using the handwheel drive. If a rising stem valve is jammed in the close position, loosen the fixing bolts that attach the
thrust base to the valve. This will release the compression in the drive components and reduce the effort to unjam the
valve. Partly open the valve, then retighten the bolts.
5.2.3 Actuator Operates but Does Not Drive Valve
1. Verify that the declutch lever has returned to motor-operated position.
2. Verify that the stem nut is fitted correctly in the actuator base.
3. Verify that the stem nut has sufficient engagement with the valve stem.
4. Verify that the key is fitted in bore/keyway applications.
5.2.4 Valve Does Not Seat Correctly
1. Verify that position limits are calibrated correctly for the valve travel.
2. Verify that the torque-seating valves have been configured to close on torque, not position.
3. Verify that closing torque value has been set high enough to suit the process conditions.
4. Verify that the valve is not obstructed.
5.2.5 Status Messages
Normal display status is listed in Section 3.6.5, Local Indication. Status or alarm messages are listed below. Once a
status or alarm condition occurs, the message will be displayed on the bottom line of the Local Control Station (LCS)
screen until the condition is addressed and cleared. If multiple status or alarm conditions are active, the bottom display
will cycle through each screen until the condition is addressed and cleared (one message per four seconds).
Status or Alarm Messages (XX = Input # (0, 1, 2))
“---% OPEN, STATUS OK” – Normal display
“---% OPEN, VALVE JAMMED” – Valve cannot start moving
“---% OPEN, LOST PHASE” – One of three phases lost
“---% OPEN, MOTOR OVERTEMP” – Thermistor range exceeded
“---% OPEN, OVERTORQUE” – Torque exceeded in mid-travel
“---% OPEN, HARDWARE FAILURE” – Indication
“---% OPEN, DDC OFF” – DDC enabled, but “OFF”
“---% OPEN, ESD ACTIVE” – ESD signal present
“---% OPEN, INHIBIT ACTIVE” – Inhibit signal present
“---% OPEN, FF OFF” – FF enabled but “OFF”
“---% OPEN, PB OFF” – PB enabled but “OFF”
“---% OPEN, DN OFF” – DN enabled but “OFF”
“---% OPEN, WARMING UP” – Warm up delay active (cold temperature option)
“---% OPEN, NO ANALOG SIGNAL” – 4-20 mA signal absent (Mod enabled, red selector switch in “REMOTE”)
“---% OPEN, DDC COM LOST” – DDC enabled, signal absent
LMENIM2306-09 AQ.indd 89 Mittwoch23.08.17 08:53
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