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Rev. 1.0
2016/7/30
SS03/05/10-EC Hardware Manual
+86-400-820-9661
2.7.3 Auxiliary Supply Voltage (Keep Alive Function)
In addition to the main power supply input, the SS-EC also has an auxiliary power input (AUX
power) for Keep Alive function of the drive. When the main power supply is off, the AUX power will
keep the logic power on, allowing the drive to remember its state data (motor position, etc.). This
allows the motor to resume operation from its previous position without a homing routine when the
main power is switched back on.
If the main power is removed while the auxiliary power is still on and the drive is disabled, the drive
will show a warning. The LED display will read
indicating under voltage. When the main
power is restored, the drive will automatically clear the warning.
If the main power is removed while the auxiliary power is still on and the drive is enabled, the drive
will show a fault. The LED display will read
indicating the internal voltage is out of range.
When the main power is restored, the drive will not automatically clear the fault. It will need to be
cleared by either the I/O alarm reset function or a clear fault command from the master controller.
2.7.3.1 Keep Alive Recovery with I/O Function
After the main power supply has been restored, the fault must be cleared. Use the alarm reset
function through input 6 (X6) if configured for alarm reset function. (See Section 3.1.2 for configuring
this input via the Step-Servo Quick Tuner software.) When an internal voltage out of range alarm
occurs, the motor is disabled. Use the servo on function through input 5 (X5), also configurable via
the software, to re-enable it.
Resume motion and normal program operation.
2.7.3.2 Keep Alive Recovery with the Master Controller
After the main power supply has been restored, the fault must be cleared. The master controller
program can write 0x80 to Control Word (0x6040) to clear the fault. When an internal voltage out of
range alarm occurs, the motor is disabled. The master controller program can write 0x0F to Control
Word (0x6040) to enable the motor.
Resume motion and normal program operation.
