73
Fault Relay and Digital I/O Connection, continued
Using Functions
Pre-programmed
into the Drive
Fault Relay- The isolated fault relay contacts are closed during normal operation
and open when a fault condition exists. The relay state is not affected by the enable
signal, I
2
t limit or warnings. All faults cause the Fault RA/RB contact to open and
the switch-off of the output stage. A list of error messages can be found in chapter
Troubleshooting.
Digital Inputs 1, 2, 3 and 4 - You can use the four digital inputs to initiate pre-
programmed functions that are stored in the drive.
Normally, the Input 3/Input 4 terminals (X3/13 and X3/14) are programmed for the
connection of limit-switches. When they are connected as limit-switch positive/
negative (PSTOP/NSTOP), a low PSTOP signal (open) on input terminal X3-13,
inhibits the positive direction of axis rotation and a low NSTOP signal (open) on
input terminal X3-14, inhibits the negative direction of axis rotation. In both cases,
the ramp function remains effective.
WARNING!
LIMIT SWITCH HAZARD
Once they are tripped, the limit switches must remain in that condition (PSTOP/
NSTOP signals low) in order to inhibit the corresponding direction of motion.
Failure to observe this precaution can result in severe injury .
Digital Outputs 1 and 2 - You can use the two digital outputs to send messages
from pre-programmed functions that are stored in the drive.
Enable Input - This is a dedicated, level-sensitive (as opposed to edge-sensitive)
hardware input which will enable the output stage of the drive when 24 Vdc is
applied and no fault conditions exist.
Note: The hardware enable is powered up upon detection of state sense versus
transition sensitivity. Refer to the UniLink on-line help for software enable
information.
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