February 2012 19 – 293
19.1.8 Corrective action
Encoder
components
If you have found that the position or angle encoder, the scanning head or the cable is defective:
8 Exchange the encoder or the encoder component or perform corrective action (e.g. clean the scale).
Control
components
If you have found that the position encoder interface on the CC 61xx or UEC 11x is defective:
8 Exchange of CC 61xx or UEC 11x
--> See ”Exchange of HEIDENHAIN components” on page 29 – 515.
To exchange the encoder components, use the enclosed mounting gauges, check gauges,
mounting aids as well as the mounting and replacing instructions.
If available, use special HEIDENHAIN equipment (PWM 9, PWT) for adjustment and signal
assessment.
In a special encoder training course you can learn about corrective action (e.g. cleaning of scales)
and how this equipment is used.
The following tolerances apply by default:
For 1 Vpp encoders: 0.6 ... 1.2 Vpp
For 11 µApp encoders: 7 ... 16 µApp
The exact tolerances of the encoders can be found in the HEIDENHAIN mounting instructions
and brochures.
The scanning head of an EnDat linear encoder is programmed to match the scale (datum shift, etc.)
For this reason EnDat linear encoders in the field must be replaced together with the scanning
head!
EnDat encoders offer the possibility of storing machine or system-dependent data in the
memory area reserved for the machine tool builder. The data may comprise safety-relevant
information.
Ask your machine tool builder whether and which information is saved in the EnDat encoder.
Make sure that the replacement unit also contains this information!
Failure to do so may result in machine damage or personal injury!
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