3-4
Main Circuit Overvoltage
• An alarm goes off if an excessive voltage is imposed on the main circuitry of the Servo Driver.
• The excessive voltage may be imposed from the power supply side or motor side due to power feedback
to the capacitor.
Alarm Indication
U Series: A. 40
H Series: E3
M Series: A. L-2
R Series: OV
Probable cause Item to check Countermeasure
Abnormal power supply voltage.
• The power supply voltage is not
within the allowable range.
*Check the rating.
• Apply voltage that is within the
allowable range.
• A surge from high-capacity
equipment that is close to the
Servo Driver is imposed on the
power lines.
• Eliminate the surge with a surge
absorber.
• Provide power to the high-ca-
pacity equipment from an inde-
pendent power supply.
The regenerative voltage is too
high.
• An error results at the time of de-
celeration or while lowering the
vertical shaft.
• The voltage between P (PA) and
N (NA) of the main circuitry is
380 VDC min. when the motor is
running.
• Connect a Regeneration Unit.
• Increase the capacity of the re-
generation capacitor.
(Applicable to the U and H Se-
ries.)
A disconnection or a wiring
mistake of the External
• There is a wiring mistake of the
External Regeneration Resistor.
• Wire the External Regeneration
Resistor correctly.
Regeneration Resistor.
(Applicable to M-, R-, and H-series
Power Supply Units.)
• The External Regeneration Re-
sistor has burned out.
• The resistance of the External
Regeneration Resistor is wrong.
• Replace the External Regenera-
tion Resistor.
The regeneration transistor has
burned out.
• The resistance between each
combination of these terminals is
∞.
RG-N (H-series Power Supply
Unit)
JP1-NA (M Series)
RG-N (R-series Power Supply
Unit)
RG-N (R-series Regeneration
Unit)
* Check the resistance twice by
interchanging the probes of the
multimeter. If each resistance
reading is 100 Ω max., the
transistor is damaged.
• Replace the Unit.
Note 1. If the regeneration transistor is found damaged, check the resistance of the External Regen-
eration Resistor. It is possible that the transistor was damaged because the resistance of the
External Regeneration Resistor was incorrect.
Servo Driver Errors Chapter 3
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