Hitachi SJ Series User Manual page 602

Chapter 18
E006 Braking resistor
overload error
When the use rate of inverter's braking resistor
operation circuit (BRD) exceeds the use rate set
beforehand in [bA-60], the inverter turns OFF its
output.
Occurrence Estimated cause(s)
• Insufficient deceleration
Error occurred time
• Load inertia is large.
during
• Capacity of braking
deceleration.
resistor is small.
• Continuous regenerative
operation
• Capacity of braking
resistor is small.
Error occurred
during operation.
• Rotated by external
force.
Error occurred
• Repetition cycle of
during repetitive
operation is high.
operations.
Exemplar measures to be taken
• Setting longer deceleration time in [FA-12] may improve the
situation that the motor is rapidly decelerated. If deceleration time
cannot be shortened, choice of resistor must be re-examined.
• The resistor may not be able to fully consume the power because
the regenerative power returned from the motor is high. Load
condition or choice of resistor must be re-examined.
• The resistor may not be able to fully consume the power because
the fan is rotated by a strong wind, or because the regenerative
power returned from the motor increases when loads are lowered
by a crane or the like. Load condition or choice of resistor must be
re-examined.
• Reduction of repetition cycle of operation may improve the situation.
Adjustment of deceleration time in [FA-12] and re-examination of
choice of resistor may also improve the situation.
18-9
Tips/FAQ/Troubleshooting
E006