29 – 568 HEIDENHAIN Service Manual iTNC 530
29.4 PWT 10/17/18 Testing Unit
Short
description
The PWT testing unit was originally designed as mounting aid for scanning heads.
However, it is also possible to check signals (A track, B track, reference mark) of motor
ecncoders!
Three different PWT versions are available:
For HEIDENHAIN motor encoders, the PWT 18 is used for 1 Vpp signals.
The PWT 18 cannot be connected in series between encoder and control.
The encoder is connected to and powered by the PWT 18.
The signals of scales or scale tapes can be observed during traverse with indirect position
measurement (i.e. the motor encoder is used for positioning).
This means that the signals of the position encoder could also be checked at "operating
speed".
For inspecting a motor encoder, the encoder or the motor shaft must be rotated externally
(e.g., manually).
Thus, motor encoder signals can hardly be checked at operating speed.
The signal amplitude is also measured when the encoder has stopped.
For a detailed assessment of the signal quality, an inspection of the position or speed encoder
with the PWM 9 is recommended.
Encoder diagnostic set Signal type ID
PWT 10 11 µApp 325411-xx
PWT 17 TTL 325412-xx
PWT 18 1 Vpp 325413-xx
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