TROUBLE SHOOTING
7-13
Possible Causes
What to Check and Suggested Measures
3.
Air vent is blocked.
Check if there is sufficient clearance around the inverter.
→
Increase the clearance.
→
Check if the heat sink is clogged.
→
Clean the heat sink.
4.
Load was too heavy.
Measure the output current.
→
Lighten the load (e.g. lighten the load before the overload
protection occurs using the overload early warning (E34).
→
Decrease the carrier frequency (F26).
→
Enable the overload protection control (H70).
7.
“OH2” External alarm input
Problem External alarm was inputted (THR).
Possible Causes
What to Check and Suggested Measures
1.
An alarm function of
the external equipment
was activated.
Inspect external equipment operation.
→
Remove the cause of the alarm that occurred.
2.
Connection ha been
performed incorrectly.
Check if the wire for the external alarm signal is correctly connected
to the terminal to which the “Alarm from external equipment” has
been assigned.
→
Connect the wire for the alarm signal correctly.
3.
Incorrect settings.
Check if the “Alarm from external equipment” has been assigned to
an unassigned terminal.
→
Correct the assignment.
8.
“OH4” PTC thermistor for motor protection
Problem Temperature of the motor rose abnormally.
Possible Causes
What to Check and Suggested Measures
1.
Temperature around
the motor exceeded
that of motor
specifications.
Measure the temperature around the motor.
→
Decrease the temperature.
→
Lighten the load.
2.
Cooling system for the
motor malfunctioned.
Check if the cooling system is operating normally.
→
Repair or replace the cooling system.
3.
Load was too heavy.
Measure the output current.
→
Lighten the load (e.g. lighten the load before overload occurs
using the overload early warning (E34) function).
→
Decrease the temperature around the motor.
→
Increase the carrier frequency (F26).
Summary of Contents for MWHE20
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Page 12: ...SPECIFICATION COMPONENT IDENTIFICATION 2 3 C B ...
