7-14
•The DC injection braking is insufficient.
If
the DC braking power is insuf
ficient, adjust the
value in n52 for DC injection control
current.
•An inappropriate brake is being used.
Use a brake intended for braking rather than holding.
7-2-7 Motor Burns
•The load is too big.
If
the load of the motor is too big and the motor is used with the ef
fective torque ex
-
ceeding
the rated
torque of the motor
, the motor will burn out. For example, the rated
torque
of the motor and capacity may be limited to eight hours of use if the inscription
on
the motor states that the motor is rated for eight
hours. If the 8-hour rated torque is
used for normal operation, it may cause the motor to bun out.
Reduce
the load amount by either reducing the load or
lengthening the acceleration/
deceleration time. Also consider increasing the motor capacity.
•The ambient temperature is too high.
The
rating of the motor is determined within a particular ambient operating tempera
-
ture range. The motor will burn out if it runs continuously at the rated torque in an
environment in which the maximum ambient operating temperature is exceeded.
Lower
the ambient temperature of the motor to within the acceptable ambient operat
-
ing temperature range.
•The withstand voltage between the phases of the motor is insufficient.
When
the motor is connected to the output of the Inverter
, a surge will be generated
between the switching of the Inverter and the coil of the motor.
Normally,
the maximum surge voltage
is approximately three times the input power
supply voltage of the Inverter (i.e., approximately 600 V).
Therefore, the dielectric strength of the motor to be used must be higher than the
maximum surge voltage.
Maintenance Operations Chapter
7
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