Maeda MK0003, Service Manual, Page: 311 / 348

5-17
Name Content
Alarm
code
Check content and
countermeasures
Reference
Driver error
*2
Error items for driver IC detection equipped
in the inverter.
Trips to protect the main element, when
momentary overcurrent (approximately
350% of the rated current), main element
temperature faults are observed, or drops in
the main element driving power occur.
(Restart run cannot be carried out on this
trip.) E30.  Are there any short-circuits?
• Check the output line.
Are there any ground faults?
• Check the output line and
motor.
Is the main element damaged?
• Check IGBT. Refer to “Method
for Checking the Inverter and
Converter Parts” for the
checking method.
Is the cooling fin clogged?
• Clean the fin.
Thermistor error When the thermistor input function is
enabled, temperature faults are detected
from the resistor value of the external
thermistor, and trips. E35.

Is the motor temperature too high?
• Check the temperature.
Is the thermistor damaged?
• Check the thermistor.
Is there noise mixing in the
thermistor signal?
• Separate the wirings.
Brake error Trips if the inverter fails to detect the
ON/OFF of the brake within the brake
control operation fault detection time (b124)
after the brake release output, when the
brake control function is enabled (b120 =
01). E36.  Is the brake performing the ON/OF
operation?
• Check the brake.
Is the b124 setting short?
• Make the b124 long.
Is the brake check signal being
inputted?
• Check the wirings.
Emergency cutoff
*3
Trips when the safety input of GS1 or GS2
has been inputted.
E37.  Are there misinputs of the GS1,
GS2?
• Check the wirings and
sequence.
Is the parameter set properly?
• Check the settings of the GS
input operation selection
(b145).
Low speed range
overload
protection (inverter
overload
protection) The electric thermal in the inverter detects
and trips if overload occurs in very low
speed ranges below 0.2 Hz. (However, high
frequency may remain in the error log.)
If the overload protection of the motor and
inverter is separated under the settings of
the motor electric thermal function selection
(b910), it can function as an inverter
overload protection as well. E38.

Is there excessive load?
• Lower the load factor.
Operator bad
connection Trips when faults or breakages exist at the
external operator (optional). E40.  Are there any communication
errors?
• Check and replace the cables.
This error will not be detected if
b165 is set to 02 (ignore).
*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.
*3: Releasing with the STOP/RESET key is not available. Release by powering ON again or with the RS (reset) terminal.