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Direction sense
It is important to check the direction sense correctly. If it is set
incorrectly, the machine will move in the opposite direction to
that expected, and may accelerate until it reaches the axis
limits. In the case of parallel twin rail drives, it is important
that the direction sense of the slave axis is set to match the
master axis. Failure to do this will cause opposite ends of the
cross-member to move in opposite directions, possibly causing
damage to the machine.
Error signal monitoring
The RLI20 laser interface continuously checks for internal
errors and errors in the encoder system that may cause invalid
position feedback signals, and signals a fault by asserting an
error line output. In the case of closed loop motion systems, for
safe operation the status of this error line must be monitored. If
the error line goes high, the position feedback signals may be
incorrect and the axis of motion must be stopped.
Power supply out of range
The correct power supply voltage is 24 V ±5 V. Power supplies
outside of this range may give unreliable operation or damage
the RLI20 unit.
Safety information
Position data integrity
If an error is signalled by the RLI20, then the RLI20 position
data may be incorrect. The system must be reset and
re-referenced before it is used for position feedback again.
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