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Appendix B
Troubleshooting
TROUBLESHOOTING CHART
Check to see if the problem you are experiencing is listed in the chart below. If the problem cannot be solved with
reference to this chart, contact the customer services department.
Fault Possible cause Action
Forcer/thrust rod fails to
move and produces no
force.
1. Drive not powered.
2. Forcer phase connections not made.
3. Forcer over-temperature sensor not
connected.
4. Forcer over-temperature.
1. Apply power to drive.
2. Check forcer phase connections on
drive.
3. Check forcer over-temperature sensor
connections on drive.
4. Allow forcer to cool.
Forcer/thrust rod fails to
move but does produce
force.
1. One or more motor phase connections not
made or made incorrectly.
2. One or more position sensor connections
not made or made incorrectly.
3. Forcer/thrust rod mechanically blocked.
1. Check forcer phase connections on
drive.
2. Check position sensor connections on
drive.
3. Check forcer/thrust rod is free to move.
Forcer/thrust rod moves
but is jerky in motion.
Incorrect pole pitch set up or phase offset
between position sensor and forcer back emf.
Check drive or controller set up.
Forcer/thrust rod moves
in wrong direction.
One or more position sensor and forcer
phase connections made incorrectly.
Check position sensor and forcer phase
connections on drive.
Page 17
ServoTube 38 Installation Guide Appendices