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• Never hard couple encoder to motor shaft. Always use flexible couplings to minimize

stress on encoder bearings.

• Avoid installing with shaft upright, liquid may pool and eventually cause internal leaking.

• When mounting the encoder secure the screws with ribbed lock washers and Thread

locker Loctite 243 or equivalent.

• For versions with connector, check to ensure there is no connector deformation and that

O-ring is in place in the connector housing, otherwise don’t use it. It is strong recommended

to orient the cable or connector downward to reduce the possibility of cable damage.

• Ensure that the connector screws are tight to ensure good electrical and mechanical

contact to avoid loosening of the connection over time.

GENERAL MECHANICAL PRECAUTIONS

|SIL3 PLe

INCREMENTAL ENCODERS

SAFETY INSTALLATION REQUIREMENTS

This Installation Guide is a simplified extract from the “Safety User Manual” chapter “4. Installation and start up”. It helps the user during the mounting process in order to safely mount and

use BEI SENSORS safety encoders in safety system loops. For detailed information consult the Safety User Manual, available upon request.

WARNING

Check that the external monitoring is compliant with the safety loop

prerequisites.

The safety encoder function requires that the four safety signals (AA/

and BB/ in digital versions or SS/ and CC/ in sine versions) are

connected to the safe PLC. Never leave one of these signals unused!

They must always be connected and used in the safety loop.

The channel 0 (Z and Z/) is not a part of the safety function! In case Z

and Z/ are not used in the application, connect each of them to pull

down 3kohms resistors connected to 0V.

Encoder’s specifications given in the datasheet or in the “Safety User

Manual” must never be exceeded.

In order to avoid the risk of sliding on the mating shaft, use positive locks

through a key on both ends for the solid shaft encoder and slots on the

hollow shaft encoder.

Never connect the encoder to mains (115V, 220V…)!

External Safety Loop Prerequisites

2WT

○

○

x(1)

x

x

x

5WT

○

○

x

x

x

2G2

○

○

x

x

x

x(1)

5G5

○

○

x

x

x(1)

5G2

○

○

x

x

x(1)

○: Prerequisite for all safety levels.

x: Additional prerequisite for SIL3/PLe.

(1)

: Not needed in case of SIL3/PLe speed without direction.

MECHANICAL MOUNTING PROCEDURE

DSO5

DSU9

Measure the driving shaft tolerance (H7) and check permissible

driving shaft runout:

User speed (rpm)

< 100

< 1500 < 4000

Permissible Runout (mm)

0.2

0.05

0.02

Recommended torque for the mounting of coupling devices “Stator Coupling” (SC) or

“Tether Arm” (TA):

SC: 1 x M3 (2N.m) + 1 x M4 (2.5N.m) -

TA: 3 x M3 or 3 x M4

SC: 2 x M5 (4.5N.m) - TA: 4 x M5

Encoder’s hollow shafts are machined with positive locks.

Slide the encoder shaft (with or without reduction sleeve) on

the driving shaft and check that the positive locks are in the

correct position for proper engagement.

When mounting the encoder, avoid compressing or extending the coupling device:

SC: 2 or 4 x M3 (2N.m) - TA: 3 x M6

(9N.m).

SC: 2 or 4 x M5 (4.5N.m) - TA: 1 x M8

(21N.m).

Tighten the clamping ring to the torque:

2N.m +/-10%

4.5N.m +/-10%

INSTALLATION GUIDE