function can be used in combination with the instantaneous outage holding function to keep the motor running when voltage drop of the power source occurs, so as to prevent shutdown due to alarm. P8-22 setting P8-18 bit1: Instantaneous power outage holding function bit1 = 0: Turn off the instantaneous power outage holding function bit1 = 1: Turn on the instantaneous outage holding function; it will turn on the outage detection function in default, and shield the alarm within the time set by P8-24. When this function is enabled, even if the main circuit of the driver is out of power, the motor can remain powered on (servo ON) within the time set by P8-24.
When the duration of instantaneous outage is shorter than the value set by P8-24, the motor will remain powered on; otherwise when the duration is greater than the set value, the motor will be powered off, and the driver will be subject to or alarm. The holding time of instantaneous outage may differ with the output of a servo unit. If the servo motor is highly loaded or has an alarm during instantaneous outage, this function is invalid. P8-18 bit2: Power failure detection function (associated with bit1) Bit2 = 0 and bit1 = 0: Turn off the power failure detection function, and power failure of the main circuit will no longer be detected.
In case of a vertical shaft application, it is required to turn on the power failure detection function; otherwise the holding brake cannot be immediately closed upon power failure of the main circuit Bit2 = 1: Turn on the power failure detection function. If the instantaneous outage holding function is not enabled at the same time, then an Al01D alarm will occur immediately upon power failure of the main circuit. P8-18 bit3: Position judgment reference switching Bit3 = 0: Command unit-based position judgment The command unit is the unit of 1 pulse input from the upper device (including group P9 multi-segment position). Bit3 = 1:
Encoder unit based position judgment The encoder unit is the unit of 1 pulse fed back from the motor encoder. 159 Technical Manual for EA190 Series Servo Driver V100 When the value set by P8-24 ≥the duration of instantaneous outage When the value set by P8-24 Caution☞ 1: For vertical shaft applications, it is not recommended to use this function, as it may result in a fall.(If this function is enabled when a DO terminal is set to BK, reconnection of the control power will cause an alarm) 2: When this function is enabled, it is also recommended to enable the torque limit function upon voltage drop of the main circuit and set a proper value for P8-22. 3:
The servo control power holds for about 80ms.If the control circuit power cannot continue power supply upon instantaneous outage, it will be handled as a general power cutoff, and the P8-24 setting is invalid.