5

Mechanical Characteristics

Part No.

Parameter

Dimension

Tolerance

Units

HEDS-5140

Codewheel Available

2

3

4

+0.000

mm

11.00 mm optical

to Fit These Standard

5

6

8

-0.015

radius codewheel

Shaft Diameters

5/32

1/8

+0.000

in.

3/16

1/4

-0.0007

Moment of Inertia

Note: The tolerance requirements are on the mating shaft, not on the codewheel.

Electrical Interface

To insure reliable encoding

performance, the HEDT-9040 and

9140 three channel encoder

modules require 2.7 k

Ω (± 10%)

pull-up resistors on output pins 2,

3, and 5 (Channels I, A, and B) as

shown in Figure 1. These pull-up

resistors should be located in

close proximity of the encoder

module (within 4 feet). Each of

the three encoder module outputs

can drive a single TTL load in this

configuration.

Mounting Considerations

Figure 2 shows a mounting

tolerance requirement for proper

operation of the HEDT-9040 and

HEDT-9140. The Aligning Recess

Centers must be located within a

tolerance circle of 0.13 mm

(0.005 in.) radius from the

nominal locations. This tolerance

must be maintained whether the

module is mounted with Side A as

the mounting plane using aligning

pins (see Figure 5), or mounted

with Side B as the mounting plane

using an alignment tool (see

Figures 3 and 4).

Figure 1. Pull-up Resistors on HEDT-9X40 Encoder Module Outputs.

Figure 2. HEDT-9X40 Mounting Tolerance.