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Limitorque QX Electronic Actuator FCD LMENIM3306-06 – 07/14
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5.1 View Diagnostics Routine
1. Enter “VIEW DIAGNOSTICS” as detailed in Section 5.3, View Diagnostics.
2. Review the various displays to try to find the reason the actuator will not operate. The displays that may help to
isolate the fault are as follows:
• View Hardware Status
• View Motor Status
• View Power Supply
• View Motor Controller Faults
5.2 Troubleshooting Problems/Corrective Action
(Refer to LMENIM3314, QX Maintenance and Spare Parts and the standard wiring diagram in the Section 3.3, Electrical
Connections). We recommend that only Limitorque service personnel perform this operation.
1. Switch off the main power supply and 24 VDC supply at terminals 6 and 7 (if used).
2. Remove control compartment cover (ACP) and protect against the ingress of moisture or dust.
3. Remove any wiring that has been connected to terminals 21, 22, 23 and 24.4. Switch on main power supply.
5. Measure VAC at 23, 24 – should be 110 VAC if actuator is supplied with optional 110 VAC circuit. If no power, check
fuses FS1, FS2 (600 VAC, 1 A, fast acting, 10.3 x 38.1 mm tube) and FS3 (250 VAC, 0.1A, time delay, 5 x 20 mm
glass tube) and replace if necessary. If replacing fuses does not fix the problem, replace damaged board. Contact
Limitorque Service at (434) 528-4400.
6. Measure VDC at 21, 22 – should be 24 VDC, maximum power of 5 W. If not, replace damaged board.
7. Replace the control compartment cover (ACP).
5.2.1 Actuator Fails to Operate
Actuator Fails to Operate from LOCAL Controls
1. Place the red selector knob in “LOCAL.”
2. If motor runs but actuator output does not turn, check that declutch lever has returned to motor operation position.
3. Check LCD display for following alarms:
• If motor runs but no actuator movement is detected, check if the display says “JAMMED VALVE” and free if
necessary.
• Inhibit signal may be present or absent at the terminals. Check for signal and adjust as necessary. “INHIBIT
ACTIVE” appears on display.
• Thermal overload of the motor may have been detected. Check motor for high temperature. Thermal overload is
self-resetting when motor cools. “MOTOR OVERTEMP” appears on the display.
4. Check to see if the position limits are set incorrectly on top of one another. See Section 3.5.4, Setting Position
Limits.
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