LTQ008 – LTQ230 Series 3-Phase Products User Instructions – AIIOM000165 EN
Page 32 of 40
8 Troubleshooting Guide
- To avoid dangerous or fatal electrical shock, turn off power to all electrical equipment
before working on electrical connections. If it is necessary to troubleshoot with live power to the actuator, use
extreme caution, and follow all relevant company safety protocols and procedures.
After completing all mounting and wiring procedures, and main power is available, if the actuator does not
respond as expected, the following procedure(s) may help in identifying the problem. If problems still exist after
consulting Table and Table , contact Flowserve for additional support.
Table 2: Fault symptoms for on/off control models
T h e a c t uat o r do e s n o t m o v e w he n c o m m and e d t o d o so .
T h e s up p l y a n d c o n t r ol s ar e m e as u r e d t o b e c o r r e c t , b u t th e a c t u a t o r s t i l l do es n o t m o v e.
T h e m o t o r is e x t r e m e l y h o t t o t h e t o u c h .
T h e a c t uat o r do e s n o t s t o p a t t h e c o r r e ct p o s i t i o n a t e it he r e nd - of - t ra v e l .
Target Action
Power source
Measure incoming power at the actuator terminal blocks.
Reference the correct wiring diagram (Error! Reference source not
found.).
Control problem
Generate move commands by the field device. Measure correct
voltage changes between hot and terminal 6 (CCW) and hot and
terminal 4 (CW).
Wire sizing
Check for the correct wire size per Table .
Overtorque
Remove the actuator from the driven device. If the actuator now
moves, the torque required by the mechanical device exceeds
that of the actuator. Increase the size of the actuator.
With the actuator removed from the mechanical equipment,
manually rotate the valve or damper through its intended range of
travel to check for mechanical problems.
Insufficient power supply and/or incorrect
wire size during installation.
Measure the voltage between hot and terminal 2 while
commanding the actuator to move. Also measure the voltage
between terminals L1, L2, and L3. The measured voltage cannot
drop more than 10% from the rated voltage.
Cams improperly set.
Remove the power supply. Check to see if the cams rotate freely
on the cam shaft using your finger. The cams must be secure and
set according to the procedures in section 5.8.
Control “noise” or excessive duty cycle.
Check for stray voltage fluctuations on the incoming control signals.
The on/off high voltage actuators have a maximum duty cycle of
25%.
Check for parallel wiring of multiple on/off actuators. Review the
site as-built wiring diagrams to verify.
Travel cams and/or mechanical stops not
positioned correctly.
Reset the end-of-travel cams and/or mechanical stops as detailed
in section 5.8.
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