Watlow ANASCAN Manual de usuario descargar pdf (Pagina 61)

APPENDIX: Input Scaling

ANASCAN User’s Guide 53

A pulse encoder which measures the movement of a conveyor is

connected to the CAS. The encoder generates 900 pulses for every inch

the conveyor moves. You want to measure conveyor speed in feet per

minute (f/m).

Setup

The encoder input is connected to the CAS pulse input. An one second

sample time gives adequate resolution of the conveyor's speed.

The resolution is:

so a display format of -99.99 to +300.00 is appropriate.

The input readings are as follows.

At the maximum pulse rate of the CAS (2000 Hz):

At zero hertz, the input reading will be 0.00 f/m.

Therefore, the scaling values are:

Parameter Low Value High Value

Process Value (PV) 0 f/m 1.11 f/m

Input Reading (RDG) 0 Hz 2000 Hz

1 pulse

1 ondsec

---------------------

60 ondssec

1minute

---------------------------

1 inch

900pulses

--------------------------

××

1 foot

12inches

-----------------------

0.006 fm

⁄

200pulses

1 ondsec

--------------------------

60 ondssec

1minute

---------------------------

1 inch

900pulses

--------------------------

××

1 foot

12inches

-----------------------

11.11 fm

⁄

1 2 ... 56 57 58 59 60 61 62

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Watlow ANASCAN Manual de usuario Pagina 61

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