EMERSON industrial control spare parts A6824R 9199-00098-13 ModBus and rack interface

Description

Determine the A6824R 9199-00098-13 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 A6824R 9199-00098-13 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 A6824R 9199-00098-13 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 A6824R 9199-00098-13 equipment speed in revolutions

per minute (rpm) using the measured Speed Detector module speed sensor output

frequency (Hz) as follows:

Equipment speed (rpm) = 60 x frequency (Hz) / number of teeth in the gear.

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 specifified as an integer multiple of the

speed sensor gear teeth quantity.

Example: There are 60 teeth in the speed sensor’s gear. With a 50 millisecond loop

time and with the equipment operating at 10,000 Hz, the largest speed Speed

Detector module Pulse A6824R 9199-00098-13 Count per Update setting (written to register 0EH) is 500.

The largest integer multiple of 60 teeth that is less than the maximum pulse count

per update setting of 500 is 8. Therefore a Pulse Count per Update value of 8 x 60

= 480 should be written to register 0EH as the Pulse Count per Update. The Pulse

Count per Update is set to 480 in order to be a multiple of the number of teeth in the

gear. The Pulse Count per Update setting of 480 provides an update every (480/

10,000 = 48 milliseconds) which is fast enough for a 50 millisecond control loop.

For this example, a value of 01EOH (480) should be written to the Speed Detector.

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