Panasonic MINAS A6 Multi Series Technical Reference page 190

7.2 Details of protective function
Error No.
Protective function
Main Sub
11 0 Control power supply
undervoltage protection
12 0 DC busOver-voltage
protection
(To be continued)
Causes
The voltage of the bus (control power
supply) of the driver module has dropped to
below the specified value.
1) Power supply voltage is low.
Instantaneous power failure has
occurred
2) Lack of power capacity...Power supply
voltage has fallen down due to inrush
current at the control power-on
3) Failure of driver module (failure of the
circuit)
4) Power supply module failed (circuit
failure).
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.
1) Disconnection of the regeneration
discharge resistor
2) External regeneration discharge
resistor is not appropriate and could not
absorb the regeneration energy.
3) Failure of driver module (failure of the
circuit)
4) Power supply module failed (circuit
failure)..
Protective Functions
Measures
Measure the applied voltage of control
power connector X11.
Check if the rated 24V voltage is secured.
1) Increase the power capacity. Change
the power supply
2) Increase the power capacity.
3) Replace the driver module.
4) Replace the power supply module.
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) 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) Change to the one with specified
resistance and wattage.
3) Replace the driver module.
4) Replace the power supply module.
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