Rockwell-automation 1397 Pulse Encoder Interface Installation Inst. Manual de usuario descargar pdf (Pagina 4)

1397 Pulse Encoder Interface Card

1397-5.13 June, 1997

Example

Using a 5,000 RPM motor with a requirement to run as low as 25 RPM —

How to Select the PPR of

a Pulse Encoder

(continued)

Determine the Pulse Encoder’s Minimum PPR Requirement —

PPR

= [1]

[60] = 120 PPR

———————

[0.02]

Pick a PPR for the Application — In This Example 500

PPR

≤

500

≤

PPR

Determine the Maximum Allowable Pulse Encoder PPR —

PPR

≤

73,000

≤

876 PPR

———————

5000

Calculate the Pulse Encoder’s Required Frequency at P.041 [Max Motor Speed] —

Freq

req

= [5,000]

[500] = 41.67kHz

————————

Conﬁrm That the Pulse Encoder Frequency

≤

80% of the Pulse Encoder’s

Maximum Rated Nameplate Frequency — In This Example 120kHz

41.678k Hz

≤

.8 (120,000)

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Rockwell-automation 1397 Pulse Encoder Interface Installation Inst. Manual de usuario Pagina 4