Hitachi SJ Series, User Manual

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18-19
Chapter 18
Tips/FAQ/Troubleshooting
E034 Output open-phase
error
When the output phase loss selection [bb-66] is set to
01, when a loose connection or disconnection of
output line, disconnection inside the motor, etc. is
detected, the inverter turns OFF its output. Detection
of phase loss state is executed in the section
between 5Hz to 100Hz.
E035 Thermistor error
If an abnormal temperature is observed during
detection of resistor level change in an external
thermistor, the inverter turns OFF its output. (When
thermistor function is enabled.)
Occurrence

Estimated cause(s)

Exemplar measures to be taken
Error occurred after
long hours of
operation.
• An output line or the
motor has a loose
connection or is
disconnected.
• You need to turn OFF the power supply and check the output lines
and the wiring condition of motor. If there is a loosened screw, the
situation may be improved by re-tightening the screw.
Motor is heated.
• The motor hasn’t been
cooled sufficiently.
• The cooling environment needs to be improved.
• Heavy load has been
applied for a long time.
• The motor’s driving environment needs to be re-examined.
• Inadequate thermistor
function setting
• Re-examination of the thermistor function setting may improve the
situation.
Motor is not
heated.
• The thermistor is broken
down.
• The thermistor needs to be repaired.
• Malfunction due to noise • The situation may be improved by taking a noise countermeasure
such as wiring separation.
Error occurred
right after the
operation started.
• An output line or the
motor has a loose
connection or is
disconnected.
• You need to turn OFF the power supply and check the output lines
and the wiring condition of motor. This error can also occur due to
motor insulation breakdown or screw tightening failure.
• Single-phase output is
used.
• For output lines, use three-phase connection.
E034
Occurrence

Estimated cause(s)

Exemplar measures to be taken
E035