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E6C3-CWZ3XH

Rotary Encoder (Incremental/Absolute)

OMRON Corporation 

● Mounting Procedure

1 Insert the shaft into the coupling.

2 Secure the Rotary Encoder.

Do not secure the coupling and shaft with screws at this

stage.

Refer to the following table for the maximum insertion length

of the shaft into the coupling.

Model

Maximum insertion length

E69-C08B/E69-C68B 6.8 mm

3 Secure the coupling.

4 Connect the power and I/O lines.

5 Turn on the Rotary Encoder and

check the output.

Model

E69-C08/E69-C68B

Tightening torque

0.44 N ⋅ m

Be sure to turn off the Rotary Encoder when connecting

the lines.

Life of Bearing

The following graph shows the (theoretical) life expectancy of the

bearing with radial and thrust loads imposed on the bearing.

3.5

Wr

3.0

Encoder

Ws

2.5

Wa:

10N

2.0

Shaft

Wr: Radial load

Ws: Thrust load

Wa:

1.5

20N

Wa:

30N

1.0 Wa:

40N

Wa:

0.5 50N

Wa:

60N

010 20 30 40 50 60 70 80 90 100

Radial load Wr (N)

Wiring

Connecting

• When extending the cable for Incremental Rotary Encoders, select

the kind of cable with care by taking the response frequency into

consideration because the longer the cable is, the more the resid-

ual voltage increases due to the resistance of the cable and the

capacitance between the wires. As a result, the waveform will be

distorted.

We recommend the line driver output type model (E6C3-CWZ3XH)

or the complementary output type model (E6C3-CWZ5GH) if the

cable needs to be extended.

In order to reduce inductive noise, the cable must be as short as

possible, especially when the signal is input to an IC.

• If the power supply has surge voltage, connect a surge suppressor

between the positive and negative terminals of the power supply to

absorb the surge voltage.

• Unnecessary pulses are output at the time the E6C3 is turned ON

or OFF. After turning ON the E6C3, be sure to wait 0.1 s before

turning ON the peripheral devices connected to the E6C3 and turn

OFF the peripheral devices 0.1 s before turning OFF the E6C3.

Cable Extension

• The rise time of each output waveform will increase when the cable

is extended. This affects the phase difference characteristics of

phases A and B.

The available length of cable varies with the response frequency

and noise. It is safer to limit the length of cable to 10 m maximum. If

a longer cable of up to 100 m is required, use the line driver output

or complementary output model. (The maximum extension with the

line driver output model is 100 m.)

Note: Recommended Cable:

Cross section:0.2 mm2 with spiral shield

Conductor resistance:92 Ω/km max. at 20°C

Insulation resistance:5 MΩ/km min. at 20°C

• The rise time varies with the resistance of the cable and the kind of

cable as well as the length of the cable.

• The residual output voltage will increase according to the length of

the cable.

Preventing Miscounting

If the operation of the E6C3 is stopped near a signal rising or falling

edge, a wrong pulse may be generated, in which case the E6C3 will

miscount. In such a case, use an increment-decrement counter to

prevent miscounting.

Extension of Line Driver Output

• Be sure to use a shielded twisted-pair cable to extend a line driver

cable.

Recommended cable: Tachii Electric Wire Co., TKVVBS4P 02A

• Use an RS-422A Receiver for the receiver side.

• The twisted-pair wires as shown in the following illustration are

suitable for RS-422A signal transmission. Normal mode noise can

be eliminated by twisting the wires because the generated electri-

cal forces on the lines cancel each other.

Twisted-pair

wires

• Be sure the E6C3 is supplied with 5 VDC when a line driver output

is used. There will be an approximately 1-V voltage drop if the

cable length is 100 m.

16

E6C3 Rotary Encoder (Incremental/Absolute)

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