Technical information

154
230V FX Series Positioning Drive Reference Manual
(b) Reduce the torque required by the load.
8. Check for high frequency motor noise, or motor oscillation (dither).
(a) High frequency noise is commonly caused by a resonating (vibrating) coupling.
(b) Check inertia of the load versus the inertia of motor. This should not exceed a
10 to 1 ratio.
9. Measure motor case temperature.
(a) Motor thermal shutdown will occur at approximately 80-85° C case temperature
unless high temperature wire is used and JP1 is in the Disable position (See the
Safety Considerations section and the Installation chapter).
(b) If high temperature wire is used and JP1 is in the Disable position, the second
thermal switch will open at motor case temperature between 100 and 120° C
depending on motor size and the rate of temperature rise.
(c) If it is determined that the thermal switch on the motor is defective, the motor
should be returned to the factory.
10. The shunt fuse will open if the maximum power dissipation of the shunt regulator circuit
is excessive. This can be avoided by the following:
(a) Lengthening the decel ramps to reduce the regeneration energy to an acceptable
level.
(b) Lowering velocity.
(c) Reduce the inertia reflected to the motor with a speed reducer or other means.
(d) Excessive dissipation in the shunt regulator circuit can also add to the base plate
amplifier temperature and increase the possibility of a “7” fault (Amplifier
bridge temperature fault).
11. Read AC line voltage. It must be maintained between 90-264 VAC (196- 264 for FX-
6200 through FX-8400), with no transients outside of this range.
(a) Faults can be caused by excessive AC line voltage or line voltage transients. The
AC line voltage must be within specified range.
(b) If the voltage is not within the specified range, a transformer may be necessary
(See the Safety Considerations section and the Installation chapter).
(c) If the AC line voltage to the drive drops during acceleration, sufficient voltage
for the motor may not be available and a “F” fault will most likely occur.
Typical causes for this are wrong size AC wiring and insufficient KVA ratings
for external transformers used to power the amplifier.
12. Shielded wire should always be used for signal wiring. Wire should be routed in conduit.
Low voltage signal wires should be separated from high voltage wires.