Pwm 8 Power Supply Via Dc-In Socket And Encoder Output (Out) Of The Interface Board - HEIDENHAIN PWM 8 Operating Instructions Manual

Voltage monitoring function of PWM 8 power supply:
If the voltage of the subsequent electronics falls below 4.8V, a warning is displayed:
When this warning appears, we recommend to power PWM 8 via the power supply unit.
The warning can be ignored, if desired. It is then no longer displayed (however a warning is displayed in the
INFO MODE). After power interruption the voltage monitor is reactivated.
To be on the safe side, the encoder supply is switched off.
The operator must reactivate it in the OPTIONS soft-key row. Afterwards, trouble-free functioning of PWM 8
can no longer be guaranteed and must be observed by the operator
6.1.3 PWM 8 Power Supply via DC-IN Socket and Encoder Output (OUT)
of the Interface Board
If the 24V power supply unit and the subsequent electronics are simultaneously connected, PWM 8 is always
powered by the 24V power supply unit. In the OPTIONS soft-key row the power supply of the encoder can
be selected:
Basic circuit diagram of power supply of encoder and PWM 8 with 24V power supply unit and
subsequent electronics connected (with interface board 11µApp, 1Vpp, TTL):
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Warning: The voltage of the subsequent electronics is too low
to power PWM 8! The encoder supply was switched off to be
on the safe side.
Press this soft key to ignore the warning.
The encoder can be powered INTernally (by the 24V power
supply unit) or EXTernally (by the subsequent electronics)
(current setting: INTernally)
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