HEIDENHAIN PWM 8 - Manual (Page 74)

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17.3.2 Switching the encoder supply to HTL
The encoder supply voltage can be switched to HTL (10 – 30V), if the soft key "CHANGE" is pressed while
the parameter "V+ [Up]" is selected (highlighted).
For safety's sake a warning is displayed which needs to be confirmed by pressing the ESC soft key.
Note:
After a power interruption (PWM8 switched off) U_MSYS is always set to 5V; it must be set to HTL again by
the operator, if required.
Safety precaution!
The encoder supply voltage has been set to HTL (10 – 30V).
TTL (5V) measuring systems connected by accident would
be destroyed in this operating mode.
After confirming this safety precaution with ESC, the internal PWM8 parameter settings are displayed.
HTL power supply is active.
With HTL the encoders can only be powered externally
"FROM CUSTOMER".
The sensor connection at the encoder input and at the
encoder output of the interface board is opened such that the
additional serial interface can be used.
If this parameter list is exited by pressing the ESC soft key, the parameter list for P1 to P10 is displayed again.
As it is the rule with the HTL interface board, the parameters P2 and P3 are not available.