Maeda MK0003, Service Manual, Page: 310 / 348

5-16
Name Content
Alarm
code
Check content and
countermeasures
Reference
Insufficient
voltage When the inverter receiving voltage reduces,
the output will be cutoff if the receiving
voltage drops below the specified value,
since the control circuit does not function
properly. Also it will trip if the DC voltage
between P/+2, N/- drops below
approximately DC 173 V (200 V level)/ DC
345 V (400 V level). E09.  Is the power voltage dropping?
• Check the power supply.
Is the voltage source capacity
sufficient?
• Check the power supply.
Is the thyristor of the inrush current
prevention circuit damaged?
• Check that the DC voltage
between P/+2, N/- drops only
when the output current is high.
Current detector
error Trips when a fault occurs in the current
detector. E10.

Inverter fault
• Repair.
CPU error
*2
Trips when a malfunction or fault occurs in
the internal CPU. E11.

Is there any source of strong noise?
• Take measures for the noise.
Inverter fault.
• Repair.
External trip Trips when the multi function input terminal
set in the external trip (12: EXT) turns ON. E12.

External device fault.
• Check the external device.
USP error Trips if the power is turned on when the run
signal is inputted to the inverter. (Only when
the USP function is selected) E13.

Is the power being turned ON while
the run signal is being inputted?
• Check the run signal.
Ground fault
protection
*2
Trips if ground fault is detected between the
output part of the inverter and the motor
when the power is being turned ON. (If
residual voltage exists in the motor, this
function will not operate.) E14.

Are there any ground faults?
• Check the output line and motor.
Are there any faults in the inverter
itself?
• Remove the output line and
check.
Are there any faults in the main
circuit part?
• Check the main circuit (refer to
[Section 11
Maintenance/Inspection].
Receiving
voltage
overvoltage
protection Trips if overvoltage state of the receiving
voltage continues for 100 seconds while the
inverter is stopped. (The overvoltage
detection value is approximately DC 390 V at
200 V level, and DC 780 V at 400 V level for
the DC voltage between P/+2, N/1.) E15.

Is the receiving voltage too high?
• Reduce the receiving voltage.
• Limit the power supply variation.
• Use AC reactors for input.
Temperature
faults Trips if the main circuit temperature exceeds
the specified value due to high ambient
temperature. E21.  Is the unit installed vertically?
• Check the installation.
Is the ambient temperature too high?
• Lower the ambient temperature.
CPU
communication
error Trips when a malfunction or fault occurs in
the internal CPU communication. E22.

Is there any source of strong noise?
• Take measures for the noise.
Inverter failure.
• Repair.
Main circuit fault Trips when a fault occurs in the main circuit
board. E25.

Is there any source of strong noise?
• Take measures for the noise.
Inverter failure.
• Repair.
*2: Reset operation with the RS port or the STOP/RESET key will not be available when errors occur. Turn the machine off once.
If an error occurs when powering on the next time, the memory is damaged, or the parameter has not been saved properly.
Initialize and reconfigure the parameter.