AB Rockwell module 1746-OW16

AB Rockwell module 1746-OW16

Technical data of product parameters

The Speed Detector Module determines the speed of a piece of equipment by 1746-OW16
measuring the frequency of the output signal from a tachometer. The tachometer
output can be sinusoidal or a pulse train. The Speed Detector provides a 16-bit
output at an update rate of 5 milliseconds for over-speed detection, and a 32-bit 1746-OW16
output at a variable update rate for speed regulation.
The Speed Detector Module is NOT applicable for CE Mark Certified Systems.Determine the update period of the 32-Bit speed output. Normally, this is used to
control the speed of equipment where accuracy is important. A longer update period
will permit an higher accuracy output. Therefore, the maximum update period
allowed by the control loop should be used to update the Speed Detector module’s
32-Bit speed output.
Example: The Ovation control system runs at a 50 millisecond loop time. The
equipment operates at 10,000 Hz. The largest Pulse Count per Update setting that
should be written to register 0EH = 10,000 Hz x 0.050 seconds) = 500
Another factor that should be considered is the number of teeth in the speed sensor’s
gear. The Speed Detector module provides the speed sensor output signal
frequency. The Ovation control system regulates equipment speed in revolutions 1746-OW16
per minute (rpm) using the measured Speed Detector module speed sensor output
frequency (Hz) as follows:To eliminate errors due to mechanical differences of teeth in the gear, complete
revolutions of the speed sensor’s gear must be counted when measuring frequency.
To implement this requirement, the Pulse Count per Update setting written to Speed
Detector module register 0EH should be specified as an integer multiple of the
speed sensor gear teeth quantity.

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