Mitsubishi Electric MELIPM Series Instruction Manual page 41

Table 6-1
Protective
Parameter
Function Name
Unit Display
Detection Level
Acceleration-time
overcurrent
Output current is
more than 200%
of motor rating.
Constant speed-
time overcurrent
Output current is
more than 200%
of motor rating.
Deceleration-time
overcurrent
Output current is
more than 200%
of motor rating.
Acceleration-time
overvoltage
Main circuit DC
voltage is more
than 400V.
Constant speed-
time overvoltage
Main circuit DC
voltage is more
than 400V.
Deceleration-time
overvoltage
Main circuit DC
voltage is more
than 400V.
Possible Cause ( ) and
The acceleration torque is beyond the drive unit
capability.
• Increase the acceleration time.
Outputs U, V and W are in a short circuit or ground
fault.
• Check the motor winding resistance.
• Check the connection cables for damage.
The motor restarted during coasting.
• Restart it after a complete stop.
Excessive load was applied instantaneously.
Outputs U, V and W resulted in a short circuit or
ground fault during constant-speed operation.
• Check the motor winding resistance.
• Check the connection cables for damage.
The deceleration torque is beyond the drive unit
capability.
• Increase the deceleration time.
Outputs U, V and W resulted in a short circuit or
ground fault during deceleration operation.
• Check the motor winding resistance.
• Check the connection cables for damage.
The mechanical brake of the motor operates too
early.
• Delay the operation timing.
Surge compounded with power during acceleration
operation.
• Install a reactor.
• Fit a surge suppressor or like to the surge source.
The regenerative energy handling capability is
insufficient.
• Fit the regenerative brake option.
Surge compounded with power during acceleration
operation.
• Install a reactor.
• Fit a surge suppressor or like to the surge source.
Load increased suddenly, activating the stall
prevention function.
The regenerative energy handling capability is
insufficient.
• Fit the regenerative brake option.
The deceleration torque is beyond the drive unit
capability.
• Increase the deceleration time.
The regenerative energy handling capability is
insufficient.
• Fit the regenerative brake option.
Surge compounded with power during deceleration
operation or stop.
• Install a reactor.
• Fit a surge suppressor or like to the surge source.
6-2
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6. TROUBLESHOOTING
Corrective Action (•)