Glossary Of Key Terms - Danfoss MCO351 Technical Data Manual

6. Troubleshooting
P19-93 - 12: Reverse operation prohibi-
ted
Meaning
The drives have been operated in reverse direction while this was not allowed according to the
setting of P734.
P19-93 - 13: Forward operation prohibi-
ted
Meaning
The drives have been operated in forward direction while this was not allowed according to the
setting of P734.
P19-93 - 92: Error from encoder moni-
toring
Meaning
Open or short circuit in accordance with the displayed LED. An error will be displayed even if no
encoder is connected and the monitor is active (P3209 = 1).
6

6.3. Glossary of Key Terms

Incremental encoder
This is an encoder system that picks up the speed and the direction of rotation and transmits on
the appropriate configuration. The number of tracks, and thus the number of signals, indicate the
properties of the encoder system. There are single-track systems that deliver a pulse signal de-
pendent on the speed as well as a fixed direction signal. Dual-track systems deliver two pulse
signals that are offset 90 degrees. By evaluating the two tracks, the direction signal is also ob-
tained. Three-track encoders deliver, as well as the two tracks of the dual-track encoder, an
additional "zero-track". This emits a signal when the zeros transit is passed through.
Illustration 6.1: Incremental Encoder Signals
Quad counts
Through edge detection, a quadrupling of the increments is produced by both tracks (A/B) of the
incremental encoder. This improves the resolution.
44
Illustration 6.1: Incremental Encoder Signals
MG.33.R1.02 - VLT ® is a registered Danfoss trademark
MCO351 Positioning Controller