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12 Troubleshooting
High-function General-purpose Inverter RX2 Series User’s Manual
12-2 Error No. and Its Measure
12
12-2-2 Details about Errors
The built-in electronic thermal function monitors the output current of the inverter (controller) and when
inverter overload is detected, the inverter turns OFF its output.
The inverter displays this error when timeout occurs because of a malfunction due to noises, loose con-
nection or disconnection of circuit for communication with the LCD Operator.
This error function can be enabled and disabled by setting of the operation selection at disconnection of
operator keypad [UA-20].
E039 Controller (Inverter) Overload Error
Occurrence Estimated cause(s) Exemplar measures to be taken
Error occurred after
a fixed period of
operation.
Operation under heavy
load condition has con-
tinued.
Re-examination of operation condition or correction of load
condition may improve the situation.
Error occurred
during acceleration.
• Insufficient accelera-
tion torque
• Load inertia is large.
• Friction torque is large.
• 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 manual torque boost function, or
by operating the inverter and making adjustments with con-
trol method in [AA121].
• Re-examination of load condition may improve the situation.
A function to suppress
overvoltage is at work.
A factor for overcurrent may have been occurred. Re-exam-
ination of acceleration time or load condition is required.
Error occurred
during deceleration.
Load inertia is large.
• Insufficient rotation regeneration torque can be eased by
setting longer deceleration time in [FA-12].
• When regenerative torque is required, the situation may be
improved by adjusting the manual torque boost function, or
by operating the inverter and adjusting with control method
in [AA121].
• Re-examination of load condition may improve the situation.
A function to suppress
overcurrent is at work.
Current may increase as a result of suppressing overvoltage.
Re-examination of deceleration time or load condition is
required.
Error occurred after
long hours of use.
System environment
changes
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).
Aging deterioration
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.
E040 Keypad Communication Error
Occurrence Estimated cause(s) Exemplar measures to be taken
Error occurred after
communication is
started.
• Loose connection
• Disconnection
Check the wiring to see whether the connection is properly
made.
Noise is mixed.
The situation may be improved by taking a noise countermea-
sure such as wiring separation.
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