18 – 308 HEIDENHAIN Service Manual iTNC 530
18.4 Further Examination of Position and Speed Encoders
Introduction If you want to make further examinations of incremental and absolute HEIDENHAIN encoders,
you can use special HEIDENHAIN measuring equipment.
The following HEIDENHAIN measuring equipment can also be used for preventive
maintenance.
If you find out, for example, that the specifications (e.g. the signal amplitude) of an encoder are
very close to the tolerance limits, you can replace this encoder as a preventive measure, in order
to guard against machine standstill at a later date!
PWM 9 With the PWM 9 Phase Angle Measuring Unit you can examine incremental encoders as well
as the incremental signals of EnDat encoders.
--> See “PWM 9 Encoder Diagnostic Set” on page 29 – 566.
Photo: Example of a recording with the PWM 9
If the PWM 9 is connected in the signal path between the encoder and the control:
Do not change the settings of the PWM 9 (e.g., parameters, encoder voltages) and do not
switch it off while the machine tool is operating.
This could lead to damage or injury to the machine or persons!
Read the operating manual of the PWM 9 in detail, before you use the device.
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