LED Detection Lighting Condition Probable Cause Corrective Action
Goes ON when power is supplied to the
control circuit.
* Defective control circuit board (1PWB).
* Check 1PWB.
7 Overload Goes ON during operation.
Operation with 105% to 130% or more of
the rated load.
* Check and correct the load (may be
overload) * When power to the control circuit is
turned OFF and then ON again, the
operation starts.
Goes ON during operation. Fan has stopped. Check the fan.
Heat
* When power to the control circuit is
turned OFF and then ON again, 7 and A
goes ON again. When reset later, the
operation starts.
(where applicable)
A sink
* Temperature around the servopack
exceeds 55 degrees Celsius.
* Decrease the temperature below 55
overheat (the heat sink may be overheated)
The motor rotates, but the torque is
unavailable. When power to the control
circuit is turned OFF and them ON
again, the operation starts, but the
torque is still unavailable.
* Motor circuit error connection, such as
U-V, V-W, W-U, or single-phase
connection.
* Correct the connection.
Goes ON when power is supplied to the
control circuit.
* Defective control circuit board (1PWB).
* Check 1PWB.
b A/D error
CPU error Goes ON during operation. * Faulty internal elements. * Resume after reset operation.
* Defective internal elements. * Check servopack.
Goes ON when power is supplied to the
control circuit.
* Defective control circuit board (1PWB).
* Check 1PWB.
F Open
phase
Goes ON when power is supplied to the
main circuit
* Poor connection to 3-phase power
supply.
* Check 1PWB.
Goes ON when power is supplied to the
control circuit.
* Defective control circuit board (1PWB).
* Check 1PWB.
C Overrun
prevention
The motor starts momentarily, then C
goes ON.
* Motor connection error. * Check the motor connection.
* Optical encoder connection error.
* Check and correct pulses in phases A,
B, C, U, V and W with 2CN.
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