691
Rotary Encoders
4
Germany: +49 621 776-4411
Consider the General Notes on the Information in the Pepperl+Fuchs Product Catalogs
Pepperl+Fuchs Group
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USA: +1 330 486 0001
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Singapore: +65 6779 9091
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4.
Installation Notes
4.1
Interference suppression measures
The use of sophisticated microelectronics requires a consistently de-
signed interference suppression and wiring concept. This applies in-
creasingly as housing designs become smaller and performance require-
ments become higher in modern machines.
The following installation notes and proposals apply to "normal industrial
environments." There is no single optimum solution to suit every interfer-
ing environment. The encoder should function correctly when applying
the following measures:
•
Abschließen der seriellen Leitung mit 120 W-Widerstand (zwischen
Receive/Transmit und Receive/Transmit) am Anfang und Ende der
seriellen Leitung (z. B. die Steuerung und der letzte Geber).
•
Place the wiring for the rotary encoder far away from power lines
loaded with interference.
•
The cable diameter of the shield must be minimum 4 mm².
•
The cable diameter must be minimum 0.14 mm².
•
The wiring of the shield and 0 V must be kept in star formation if
possible.
•
Do not bend or clamp the cable.
•
Maintain a minimum radius of curvature in accordance with the data
in the data sheet, and avoid sheer and tensile stress.
4.2
Operating notes
•
Every Pepperl+Fuchs rotary encoder leaves our factory in perfect
condition. To maintain this quality and guarantee undisturbed
operation, note the following specifications:
•
Avoid shock impacts to the housing and the encoder shaft in
particular, as well as axial and radial overloading of the encoder shaft.
•
The accuracy and service life of the encoder are guaranteed only
when a suitable coupling is used.
•
The operating voltage must be switched on or off at the same time for
the rotary encoder and connecting device (e.g., control unit).
•
Any wiring activity may be carried out only when de-energized.
•
The maximum operating voltages must not be exceeded. The devices
must be operated with safety extra-low voltages.
4.3
Notes on fitting the shield
The immunity of a system is largely determined by the correct choice of
shield. Installation errors often occur in precisely this area. The shield is
often laid only on one side and soldered to the grounding terminal by a
wire, which is authorized in LF technology. However, with EMC it is the
rules of HF technology that apply.
A basic objective of HF technology is that HF energy is led to the ground
with as little impedance as possible because it otherwise discharges in
the cable. Low impedance is achieved through a large-area connection
with metal areas.
You must note the following:
•
Connect the shield on both sides to a large area on a "common
ground," provided there is no risk of potential equalization currents.
•
Pull back the entire shield behind the isolation and clamp it to a large
area below a tension relief.
•
When using a cable connection, connect the tension relief directly to
a grounded area on the screw terminal, ensuring all-round contact.
•
When using plugs, only metalized plugs may be used (e.g., SUB-D
plugs with metalized housing). Ensure the direct connection of the
tension relief to the housing.
5.
Safety Notices
Warning
You must note the national safety and accident prevention
regulations as well as the following safety information in
these operating instructions when working with a rotary
encoder.
If faults cannot be rectified, the device must be switched
off and protected against inadvertent startup.
Repairs may be carried out only by the manufacturer.
Access and modifications to the device are not permitted.
.
Caution
Only tighten the clamping ring if a shaft is inserted into the
area of the clamping ring (hollow shaft rotary encoder).
Tighten all screws and connectors before the rotary en-
coder is put into operation.
.
Do not stand on the rotary encoder!
.
Do not make subsequent modifications to the drive shaft!
Avoid impact!
.
Do not make subsequent modifications to the housing!
Introduction
