Page 739 - Sensors and Systems - North American Catalog
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Rotary Encoders
4
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Rotary Encoders
Introduction
4. Installation Notes
4.1 Anti-interference measures
Because of the sensitive nature of today’s electronics, a consistently
applied anti-interference and wiring protocol should be designed into any
encoder system. The following procedures should be followed whenever
mounting an encoder in a normal industrial environment (please note that
no two environments are the same—if you have questions, please contact
your local Pepperl+Fuchs representative for a detailed analysis of your
application).
•
Separate DC and AC circuits by metal conduit or metal divider.
•
Confirm earth ground connected to metal conduit and metal divider
•
Keep encoder wiring away from power cables and conduit. If crossing
power cables is necessary, make sure the wires are perpendicular, not
parallel.
•
Encoder cable should have twisted pair wires with braided shield.
•
Make sure your cable’s wire has a cross section of at least 26 AWG
(0.14 mm
2
).
•
Do not kink or bend the cables.
•
Do not exceed the minimum bending radius as shown on the cable data
sheet. Avoid tensile and shearing loads on the cable.
4.2 Operating notes
•
Do not strike or hammer on the encoder housing or shaft.
•
Do not overload the encoder shaft, either axially or radially.
•
The accuracy and service life of the encoder is guaranteed only if a
suitable coupling is used.
•
Power to the encoder and controller must be applied at the same time.
•
Do not service wiring with power applied to the system
•
Do not exceed maximum operating voltage.
4.3 Notes electrical shielding
The interference-resistance of a system depends on the correct shielding.
This is where installation errors are frequently made. Often the shield is
connected to one side and then to the ground terminal with a soldered wire.
This is valid in NF technology. For EMC, however, the rules of HF technology
apply. A basic goal of HF engineering is to direct the HF energy to ground at
a low as possible impedance. Otherwise, it discharges into the cable. A low
impedance is achieved by a large area connection to metal surfaces.The
following precautions must be observed:
•
Apply shielding on both sides to a common ground.
•
The shield has to be installed behind the insulation and must be
clamped to a large surface below the strain relief.
•
With screw-type cable connections, the strain relief must be grounded.
•
Use only metallic plugs (such as sub-D plugs with metallic housings).
5. Safety Notices
Warning
Please observe the national safety and accident prevention
regulations as well as the subsequent safety instructions in
these operating instructions when working on encoders.
If failures cannot be remedied, the device must be shut
down and secured against accidental operation.
Repairs may be carried out only by the manufacturer.
Entry into andmodifications of the device are not permissible.
.
Caution
Do not tighten the clamping ring without the shaft being
inserted. Overtightening the clamping ring without the shaft
may damage the clamping ring.
Tighten all screws and plug connectors prior to operating the
encoder.
.
Do not stand on the rotary encoder!
.
Do not make modifications to the drive shaft!
Avoid impact!
.
Do not make modifications to the housing!
