30 – 566 HEIDENHAIN Service Manual iTNC 530 HSCI
30.4 PWT 10/17/18 test unit
Brief description îš„ The PWT phase angle test unit is a mounting and adjusting aid for the scanning heads of exposed
incremental encoders.
However, it is also possible to check signals (A track, B track, reference mark) of sealed linear and
angular encoders and of motor encoders.
îš„ Three different PWT versions are available:
îš„ For HEIDENHAIN motor encoders, the PWT 18 for 1 Vpp signals is used.
îš„ The PWT cannot be connected in series between motor encoder and control.
îš„ The encoder is connected to and powered by the PWT 18.
îš„ 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".
îš„ 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.
îš„ The signal amplitude is also measured when the encoder has stopped.
îš„ For a detailed assessment of the signal quality, an inspection of the position or speed encoder with
the PWM 9 is recommended.
Encoder
diagnostic kit
Signal type ID Suited for:
PWT 10 11 µApp 325411-xx Exposed and sealed encoders
PWT 17 TTL 325412-xx Exposed encoders
PWT 18 1 Vpp 325413-xx Exposed and sealed encoders,
motor encoders
The PWT 17 can only be used for exposed encoders!
The electronic circuit of an exposed encoder converts the TTL signals to 11 µApp signals which
the PWT 17 requires for evaluation.
Sealed encoders do not feature such electronic conversion.
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