NSK MEGATORQUE M-ESB-YSB2020AB300 - Abnormal Main AC Line; Over Current: P2; Control AC Line under Voltage: P3

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10.3. Cause and Remedy of Alarm
u Abnormal Main AC Line Voltage (Excessive voltage/Low voltage): P1
Cause Remedy
(1) Abnormal power supply voltage.
(2) à Main circuit voltage is excessive due to
high acceleration/deceleration under heavy
load inertia.
à The voltage of the input power of the
power amplifier exceeds 250 VAC due to
error in the power supply.
(3) The voltage of the power amplifier main
circuit lowers below 70 VAC.
· Check the main power supply.
(Excessive voltage, low voltage and power source
capacity.)
· Check fuse, power source and the cable, and then
turn power on again.
(4) Blown fuse.
(Motor over temperature, error in power
supply wiring, Driver Unit abnormal.)
· Refer to “Appendix 4. How to Replace ESB Driver
Unit.”
(5) Excessive regeneration voltage.
· Readjust operation duty; reduce the load, and
acceleration/deceleration.
(6) Defective PCB.
(When the alarm is on after the Motor stops
even power source and fuse are normal.)
· Refer to “Appendix 4. How to Replace ESB Driver
Unit.”
Note: 1) When the regeneration dump resistor cannot process regenerative current, the voltage
of direct current to main circuit will be too high, and, eventually, the alarm will be on.
2) Decrease acceleration/deceleration.
u Over Current: P2
Cause Remedy
(1) Poor insulation of the Motor. (Refer to
“Appendix 2. How to Check Motor
Condition.”)
· Replace the Motor.
(2) Defective Motor Cable. (Refer to “Appendix
2. How to Check Motor Condition.”)
· Replace the Cable.
(3) Defective FET of Power Amplifier. (When
the alarm is on even the Motor and Motor
cable are normal.)
· Refer to “Appendix 4. How to Replace ESB Driver
Unit.”
l The alarm may be accompanied by “Abnormal main AC line voltage (blown fuse)” alarm due
to excessive current flow.
u Control AC Line Under Voltage: P3
Cause Remedy
(1) Low voltage of control power input.
· Check the control power voltage.
(Low voltage due to over current or output shorting.)
(2) Control circuit voltage for the power
amplifier falls below 70VAC due to inferior
power supply.
· Turn off power, check the power supply and power
cable, and then turn on power again.
(3) Defective PCB.
(When the alarm is on after control power
is turned on.)
· Refer to “Appendix 4. How to Replace ESB Driver
Unit.”