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6. TROUBLESHOOTING
6-3
6
Table 6-1 (Continued)
Parameter
Unit Display
Protective
Function Name
Detection Level
Possible Cause (
)
and
Corrective Action (•)
Electronic
overcurrent
protection
The motor and drive unit are operated under
overload.
•
Reduce the load.
•
Increase the capacities of the motor and drive
unit.
Undervoltage
AC input power
supply voltage is
less than about
150V.
An instantaneous voltage drop in the AC input
power supply from the starting of a large capacity
equipment, for example.
NOTICE
Do not switch the AC input power off while
the motor is running at high speed. Doing
so may activate the undervoltage protective
circuit instantaneously under the influence
of a motor-generated voltage.
The AC input power supply voltage is insufficient.
MEMO
An alarm signal is not output if this
protective circuit is activated with the AC
input power insufficient. It is also not
recorded in the alarm history. To export as
an external signal the fact that this
protective circuit has been activated, assign
the UVT signal to the control circuit output
terminal using Pr. 190 or Pr. 194.
Fin overheat
Heat sink
temperature is
higher than the
permissible value of
the components.
The ambient temperate exceeded the permissible
temperature.
The cooling fan failed.
MEMO
An alarm signal can be provided by making
control circuit output terminal assignment.
PU disconnection
A connection fault of the parameter unit occurred.
Refer to: Pr. 75 [Section 8.2]
RS-485 communication was interrupted.
The number of communication retries exceeded the
Pr. 121 setting.
Refer to: Pr. 121 [Section 8.6]
Stall stop
Refer to: Pr. 22
[Section 8.5.4]
Motor overload activated the stall prevention
function consecutively, stopping the motor.
•
Reduce the load.
•
Increase the capacities of the motor and drive
unit.
Out-of-
synchronism
The load is too heavy.
•
Increase the acceleration time setting.
•
Reduce the load.
The motor being driven is other than the specified.
•
Use the specified motor.