169
(2) Overspeed
【
Display
】
【
Description of detected alarm
】
The rotation speed of the servomotor exceeds 1.1 times the maximum
speed.
【
Causes and Solutions
】
Causes
Solutions
Wrong servomotor output wiring
Correct the wiring of power cables (U, V and W).
The rotation speed of the Servo
motor overshoots.
Check the speed waveform during acceleration (see the figure below)
and take the following countermeasures.
• Increase P1.37 (acceleration time).
• Increase P1.52 (S-curve time constant).
• Increase P1.15 (auto tuning gain 1).
Max.rotation
speed
Overshoot
(3) Overvoltage
【
Display
】
【
Description of detected alarm
】
The DC voltage inside the servo motor drive exceeds the upper limit.
【
Causes and Solutions
】
Causes
Solutions
The source voltage is too high
(immediately after power-on).
• Check if the source voltage is within the specification limits.
• Insert a reactor if there is a power factor improvement capacitor.
Unconnected external regenerative
resistor or wrong wiring
• Connect the external regenerative resistor.
• Correct the wiring of the external regenerative resistor.
Broken regenerative transistor
Replace the servo motor drive
The internal DC voltage can be checked in the monitor mode of the keypad.
[dP-15]: Internal DC link voltage (max. value), if approximately over 420 V, overvoltage is detected