Technical information

152
230V FX Series Positioning Drive Reference Manual
Troubleshooting Procedures
1.) Check coupling to motor shaft.
(a) A flexible coupling must be used on the motor shaft to minimize mechanical
stress due to radial loads, axial loads and/or misalignment.
(b) Some flexible couplings have a resonant frequency and can cause an audible
noise and oscillation.
2. Check indexer or gear reducers, etc.
(a) Check gear oil level. Low or no gear oil can damage equipment.
(b) Heavy oil may produce enough frictional torque to prevent the system from
reaching desired speed. It is strongly suggested that a synthetic oil is used in
gear reducers or rotary tables. This will reduce the amount of current it takes to
drive the motor.
(c) Check maximum input speed to gear reducers, indexers, etc. Many worm gear
reducers have a maximum input speed of 1750 RPM.
3. Procedure for “2” faults.
(a) Check wiring on motor and drive ends.
(b) Check that there are no frayed wires which may cause a short.
(c) Check condition of motor power cable. Look for cuts in cable jacket.
Note
If cause of shorts faults can not be determined, write down all observations prior to and
after the shorts fault occurred. Contact EMERSON Motion Control Technical Service.
4. Check load for mechanical restriction (rubbing, binding, jerky movement).
(a) Ensure load is as specified.
(b) Neither the motor nor the amplifier can withstand repeated “hard stop”
conditions. A “hard stop” condition occurs when the motor is physically
obstructed and brought to an instantaneous stop. Utilize the drive’s hardware
and software travel limit provisions to avoid this condition.
(c) Check system sizing calculations.
5. Check motor resolver cable.
(a) Ensure that it is connected securely at both ends. The amplifier end connector
must be secured by the retaining screws. The wires not insulated at the motor
end must be secured properly by the terminal block contacts.