Rockwell Automation 2092-DAx Ultra1500 User Manual - Manual (Page 99)

Publication 2092-UM001D-EN-P — July 2005
Ultra1500 Application Examples 5-19
If the battery voltage is between 2.8 Volts and 3.1Volts, the encoder will
transmit a battery warning to the drive, which is indicated to the user via the
status display as the warning message:
If the battery voltage is less than 2.8 Volts, the encoder will transmit a battery
error to the drive, which is indicated to the user via the status display as the
error message:
Since the battery is stored in the drive and the motor feedback cabling
provides the battery voltage to the encoder, it is important to note that any
disconnection of the motor feedback connectors at the drive end or motor end
will result in a battery error. The encoder latches a battery fault condition, and
a Fault Reset must be issued to the drive in order to clear the fault in the
encoder. (A simple power cycle will not clear the battery error, even if the
battery is replaced or reconnected.)
The Ultra1500 provides a method for an external position controller to
monitor the state of the absolute position feedback, in order to determine if a
loss of absolute position has occurred. Using Ultraware, the Absolute Position
Valid signal can be mapped to a digital output as shown in the figure below:
This signal is used by the controller to indicate when absolute position motion
is not possible, and a homing procedure is necessary.