Rockwell-automation 1397 Pulse Encoder Interface Installation Inst. Instrukcja Użytkownika Pobierz pdf (Strona 2)

1397 Pulse Encoder Interface Card

1397-5.13 June, 1997

Pulse Encoder

Waveform: Square Wave — Constant Amplitude

Requirements

Over Entire Speed Range, Including Zero

Speed

Differential Single-Channel or Quadrature

Output: (Dual-Channel)

Duty Cycle: 50% Nominal

Quadrature: Required for All Regenerative Drives

Line Drivers: May Be Required to Satisfy the Pulse

Encoder Interface Card’s Voltage Limits

Wiring

Refer to the 1397 User Manual — Publication 1397-5.0

Requirements

Pulse Encoder

Power Supply: +15VDC,

5%, 200mA Maximum

Interface Card

Requirements

Absolute: 100kHz

Max Frequency

Min Frequency: 0kHz

Recommended: 73kHz

Max Frequency

Differential Voltage:

Input +25VDC Maximum to Common

Requirements +5VDC Minimum Differential

+15VDC Maximum Differential

Input Impedance:

11k

Ω

Line Termination:

100

Ω

in Series with (1) 3900pf Capacitor

Speciﬁcations

How to Select the PPR of

a Pulse Encoder

A 120 PPR pulse encoder can maintain a minimum speed of 25 RPM

at the accuracy listed in the

Speciﬁcations

above. The drive can operate

below minimum motor speed but with degraded accuracy. If a lower

motor speed is required, a pulse encoder with a higher PPR rating is

required.

where:

PPR

= The Pulse Encoder’s Minimum

Pulses-per-Revolution

= The Required Minimum Motor Speed in RPM

PPR

[1]

[60]

——————

0.02

Step 1 — Determine the pulse encoder’s minimum PPR requirement.

To select a pulse encoder —

1 2 3 4 5 6 7 ... 11 12

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