TROUBLE SHOOTING
7-16
Possible Causes What to Check and Suggested Measures
5. The acceleration /
deceleration time was
too short.
Recalculate the required acceleration/deceleration torque and time
from the moment of inertia for the load and the deceleration time.
→ Increase the acceleration/deceleration time (F07, F08, E10, E11
and H54).
6. The wires to the motor
are too long and
caused a large amount
of current to leak from
them.
Measure the leak current.
→ Connect an output circuit filter (OFL).
12. “Er1” Memory error
Problem Error occurred in writing the data to the memory in the inverter.
Possible Causes What to Check and Suggested Measures
turned off when the
inverter was writing
data (especially
initializing data), and
the remaining control
circuit voltage was not
high enough to enable
writing of data.
Check if pressing the PRG/RESET key resets the alarm after the
function code data are initialized by setting the data of H03 to 1.
→ Return the initialized function code data to their previous settings,
and then restart the operation.
2. A high intensity noise
was given to the
inverter while data
(especially initializing
data) was being
written.
Check if appropriate noise control measures have been implemented
(e.g. correct grounding and routing of control and main circuit wires).
Alternatively, perform the same check as described in (1) above.
→ Improve noise control. Alternatively, return the initialized
function code data to their previous settings, and then restart the
operation.
3. The CPU did not
operate normally.
Initialize the function code data by setting H03 to 1, and then reset the
alarm by pressing the PRG/RESET key and check that the alarm goes
on.
→ This problem was caused by a printed circuit board (PCB)
(including the CPU) malfunction, so it is necessary to replace the
PCB.
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