Hitachi SJ Series User Manual page 601

Chapter 18
E005 Motor overload error
The built-in electronic thermal function monitors the
output current of the inverter and when a motor
overload is detected, the inverter turns OFF its
output. The inverter trips according to the setting of
the motor electronic thermal function.
When a motor overload error occurred, the inverter
does not accept a reset input for 10 seconds.
Occurrence Estimated cause(s)
• Operation under heavy
load condition has
Error occurred
continued.
after a fixed period
of operation.
• Thermal level is set high.
• Insufficient acceleration
torque
• Load inertia is large.
Error occurred
• Friction torque is large.
during
acceleration.
• A function to suppress
overcurrent is at work.
• Load inertia is large.
Error occurred
during
deceleration.
• A function to suppress
overvoltage is at work.
• System environment
changes
Error occurred
after long hours of
use.
• Aging deterioration
Exemplar measures to be taken
• Re-examination of operation condition or correction of load condition
may improve the situation.
• When the motor thermal level setting in [bC110] is not appropriate,
re-examination of the setting may improve the situation.
• Setting longer acceleration time in [FA-10] can ease the insufficient
acceleration torque.
• When acceleration torque is required, the situation may be
improved by adjusting the boost function in [Hb141], or by
operating the inverter and making adjustments with control method
in [AA121].
• Re-examination of load condition may improve the situation.
• A factor for overcurrent may have been occurred. Re-examination of
acceleration time or load condition is required.
• Setting longer deceleration time in [FA-12] can ease the insufficient
regenerative torque.
• When regenerative torque is required, the situation may be
improved by adjusting the boost function in [Hb141], or by
operating the inverter and adjusting with control method in [AA121].
• Re-examination of load condition may improve the situation.
• Current may increase as a result of suppressing overvoltage.
Re-examination of deceleration time or load condition in [FA-12] is
required.
• The situation may be improved by reducing the motor load, or
performing a system maintenance (e.g., cleaning the fan to be
driven and removing clogging in the duct).
• If the issue is not solved by reduction of the load and system
maintenance, aging deterioration of a life-limited component may be
the cause. A repair is required.
18-8
Tips/FAQ/Troubleshooting
E005