HEIDENHAIN PWM 8 - Manual (Page 30)

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Basic circuit diagram of the power supply of the encoder with the power supply unit connected:
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The standard setting of the encoder power supply is 5V; when operating with HTL interface board without
subsequent electronics 12V.
Current consumption of PWM 8 when powered via DC-IN socket:
(measured with 11µApp interface board)
Voltage at DC-IN 10 V 12 V 15 V 20 V 24 V 30 V
PWM 8 current consumption 500 mA 420 mA 350 mA 270 mA 230 mA 200 mA
PWM 8 current consumption
with encoder (100 mA) 580 mA 480 mA 400 mA 310 mA 260 mA 220 mA
6.1.2 Power Supply of PWM 8 and Encoder via the Encoder Output
(OUT) of the Interface Board
PWM 8 can be integrated into the encoder circuit. For this purpose the subsequent elec-tronics must be
connected to the encoder output (OUT) of the interface board. The supply voltage for PWM 8 is taken from
the subsequent electronics. In order to reduce the power consumption of the subsequent electronics, the
background lighting of the display is auto-matically switched off!
Basic circuit diagram of the power supply of encoder and PWM 8 with subsequent electronics
connected (with interface board 11µApp, 1Vpp, TTL):
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