Panasonic minas a series Operating Manual page 80

Overshoot or undershoot
The motor overheats (burnt)
Category
Adjustment Gains are not correct.
Installation Load inertia is too large.
Rattling or slip of the machine
Environment (ambient temperature, etc.)
The cooling fan does not work. The
air intake is dirty.
Mismatch between the driver and
motor
Motor bearings fail.
The electromagnetic brake is ON (fail-
ure to release the brake).
The motor fails (due to oil, water, etc.).
The motor is operated by external
forces while the dynamic brake is ac-
tivated.
Causes
Check the gains using the wave form graphics monitoring
function of PANATERM, speed monitor (SP) and/or torque
monitor (IM). Adjust the gains. See "Adjustments" chapter.
Check the load inertia using the wave form graphics moni-
toring function of PANATERM, velocity monitor
Check the coupling between the motor and machine.
If the ambient temperature is higher than the specified value,
install a cooling fan.
Check the cooling fans of the driver and machine. The cool-
ing fan of the driver should be replaced at regular cycles.
This replacement should be done by a service engineer of
the sales agent.
Check the nameplates of the driver and motor. For available
combinations between driver and motor, see the instruction
manuals or catalogues.
Turn off the power. Rotate the motor shaft by hand to check
whether abnormal sound (rumbling) occurs or not. If it
rumbles, replace it with a new one, or repair it.
Check the voltage at the brake terminal. Apply 24VDC to re-
lease the brake.
Avoid high temperature/humidity, oil, dust and iron powders.
Check the operation pattern, use and working status. This
kind of operation should be avoided.
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Countermeasures