Pwm 8 Mode: Measure U/I - HEIDENHAIN PWM 8 Operating Instructions Manual

4.4 PWM 8 MODE: MEASURE U/I

The PWM MODE: MEASURE U/I the current consumption and the power supply of the encoder can be
measured.
Depending on the interface board also the sensor voltages can be measured as well.
In the subsequent electronics the sensor lines serve to tap the encoder voltage directly at the encoder at
high resistance and to feed it back to the subsequent electronics. Voltage drops on the supply lines of the
encoders are then compensated in subsequent electronics offering compensation.
TTL, HTL and 1Vpp encoders are equipped with sensor lines.
If an error is detected during measurement of the sensor voltages, a blinking error field is displayed in
MODE: MEASURE U/I.
A sensor-voltage error is displayed, if:
+ sensor smaller than 90 % of U-MSYS, or
- sensor larger than 10 % of U-MSYS
Note:
In the PWM 8 MODE: MEASURE U/I the supply lines of the encoder and the sensor lines are separated,
whereas in all other PWM 8 MODES they are connected to each other!
The current consumption of the terminating resistors (with TTL and HTL interface boards) is displayed
together with the current consumption of the encoder. I.e. even if no encoder is connected, the current
consumption of the encoder is displayed, if the terminating resistors and the encoder supply voltage
are switched on.
Error display during measurement
of the sensor voltage
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