HEIDENHAIN iTNC 530 Service Manual page 656

"Scanning" a signal with a lower amplitude (low motor torque) results in a smaller difference
between pulses and pauses.
PWM
PWM
An infinite low or missing signal effects a ratio of pulse to pause of 50:50!
The torque on the motor is zero.
1– 656 HEIDENHAIN Service Manual iTNC 530
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