power automation PA 8000 LW Series, Installation Instructions Manual, Page: 38 / 132

3.3.2.4 Output Monitor
The functionality of the analog output to the drive is permanently moni-
tored by the system. The real analog output signal is read-in and com-
pared to fixed voltage level. Thus in case of defective digital/analog
converter, the system can react and avoid machine damages.
Fig. 14: 4AXLX output monitor
Analog output monitor
– Deactivates the safety relay "CNC Ready" (refer &)
– Outputs an error message:
CNC 75 D/A output __ defective or missing
where "__" indicates the number of the defective axis
In case of errors, the system:
– Check carefully the analog wiring between CNC and drive
(refer &)!
– Disconnect the cable that goes to the drive, and check if the
error still occurs
– Check machine parameter and Drive.cfg values related to this
error monitoring
This monitoring is able to detect as well effective defectiveness of
the digital/analog converter, but more frequently it detects noise
or signal interference on the cable to the drives. Therefore:
3.3.2.5 Analog axes wiring example
The following schematics demonstrate the recommended way of con-
necting the CNC analog outputs to the analog inputs of the drives,
depending on the analog input type of the drive.
L
CAUTION
PA 8000 LW CNC control unit
Design and function
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