Panasonic MINAS A6 Series, Technical Reference

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Protective Functions
7-6
7.2 Details of protective function
Error No.
Protective function Causes Measures
Main Sub
11 0 Control power supply
undervoltage protection The voltage of the bus (control power
supply) of the driver module has dropped to
below the specified value. Measure the applied voltage of control
power connector X11.
Check if the rated 24V voltage is secured.
1) Power supply voltage is low.
Instantaneous power failure has
occurred
1) Increase the power capacity. Change
the power supply
2) Lack of power capacity...Power supply
voltage has fallen down due to inrush
current at the control power-on
2) Increase the power capacity.
3) Failure of driver module (failure of the
circuit)
3) Replace the driver module.
4) Power supply module failed (circuit
failure).
4) Replace the power supply module.
12 0 DC busOver-voltage
protection The DC bus (main power supply) voltage of
the driver module exceeded the acceptable
input voltage range. = Voltage between P
and N of the converter portion of the control
power supply has exceeded the specified
value. Source voltage is high. Voltage surge
due to the phase-advancing capacitor or
UPS (Uninterruptible Power Supply) have
occurred. Measure the applied voltage of main power
connector X102.
Check if the voltage is excessive.
Input the correct voltage to the power
module.
Try removing the phase advance capacitor
and UPS.
1) Disconnection of the regeneration
discharge resistor
1) Measure the resistance of the external
resistor connected between terminal P
and B of the driver. Replace the
external resistor if the value is ∞.
2) External regeneration discharge
resistor is not appropriate and could not
absorb the regeneration energy.
2) Change to the one with specified
resistance and wattage.
3) Failure of driver module (failure of the
circuit)
3) Replace the driver module.
4) Power supply module failed (circuit
failure)..
4) Replace the power supply module.
(To be continued)