— 14-5 —
14.2.2.2. Abnormal Main AC Line Voltage
[Output] DRDY: Open
[TA] P1 > Main AC Line Trouble
[LED] P1
[Motor Condition] Servo-OFF
Table 14-4: Cause and Remedy: Abnormal main AC line voltage (Over/Under)
Cause Remedy
(1) Abnormal power supply voltage.
(2) ◊ Main circuit voltage is excessive due to high
acceleration/deceleration under heavy load.
◊ Defective power source gives over AC250V
to the main power supply for power amplifier
main circuit.
(3) Defective power source gives under AC70V to
power amplifier main circuit.
• Check main power supply.
(Excessive voltage, low voltage and power source
capacity.)
• Check fuse, power source and the cable, then turn
power on again.
(4) Blown fuse.
(Motor over temperature, abnormal power
supply wiring, Driver Unit abnormal.)
• Check blown fuse.
• Check the fuse, power supply and cables, then turn
on power again.
(5) Excessive regeneration voltage. • Readjust operation duty, the load and
acceleration/deceleration.
(6) Defective PCB.
(When the alarm is on after the Motor stops
even power source and fuse are normal.)
• Replace Driver Unit.
◊ Standard ESA Driver ----------- [Appendix 4]
Note : 1) When the regeneration dump resistor cannot process regenerative current, the voltage
of direct current to main circuit will be too high and the alarm will be on.
2) Decrease acceleration/deceleration.
14.2.2.3. Over Current
[Output] DRDY: Open
[TA] P2 > Over Current
[LED] P2
[Motor Condition] Servo-OFF
Table 14-5: Cause and Remedy: Over current
Cause Remedy
(1) Poor insulation of the Motor.
(Refer to “Appendix 2. How to Check Motor
Condition.”)
• Replace Motor.
(2) Defective Motor Cable.
(Refer to “Appendix 2. How to Check Motor
Condition.”)
• Replace Cable.
(3) Defective FET of Power Amplifier.
(When the alarm is on even the Motor and
Motor cable are normal.)
• Replace Driver Unit.
◊ Standard ESA Driver--------------------[Appendix 4]
Note : The alarm may be accompanied with abnormal main AC line voltage (blown fuse) alarm due
to excessive current flow.
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