
SAFETY PRECAUTIONS
B–65152E/03
8
CAUTION
D For models requiring forced cooling, ensure that the cooling is adequate and operating
normally.
Any abnormality in the cooling system may cause the motor to operate abnormally or
malfunction. In the case of forced–air cooling, ensure that the fan is not clogged with dust or
chips. In the case of liquid cooling, ensure that the coolant level is normal and that the pipes are
not clogged. In both cases, clean and inspect the cooling system periodically.
D When mounting a source of inertia, such as a pulley, on the shaft, minimize imbalance.
A large imbalance may cause the motor to vibrate abnormally, ultimately resulting in damage
to the motor.
D A motor having a keyed shaft must always be used with the key.
If the motor has a keyed shaft, operating the motor without the key may result in the motor torque
being degraded or in an imbalance being generated, resulting in failure of the motor.