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VIM6* Vibration Sensors
Installation
3.3
Electrical Connection
Note
Connection Diagram
Earth and ground loops are among the most common problems when using measuring setups
with sensitive sensor technology. These loops are caused by unwanted differences in potential
in the circuit between the sensor and the control interface.
Four different grounding concepts are described below. The appropriate concept should be
selected for the application. Note that different cable types and other accessories may be
required depending on the grounding concept.
Note
Various accessories are available for the VIM6* vibration sensors. These are available online at
www.pepperl-fuchs.com, on the product page for the relevant VIM6* vibration sensor.
Grounding Concept 1 (Recommended)
Only applicable for:
•
Versions with an integrated cable outlet
•
Plug versions with a P+F connection cable accessory
Situation/Requirements of
the Application
No EMC interference is
expected from the machine
side,
e.g., from the frequency
inverter
Prevention of earth loops nec-
essary,
e.g., when using long cables
approx. 500 m in length.
Coupled interference must be
deflected
Table 3.1
14
Effects of the Grounding Concept
•
The machine should be connected to the sensor housing,
or there is no effect on the quality of the measurements
provided by the sensor.
•
EMC interference that still directly affects the sensor head
can discharge via the machine earth.
No conductive connection between the sensor housing and
the cable shield required:
This means that there is no connection between the machine
earth (point 1 in Fig.) and the earth at the control interface (->
point 6 in Fig.).
•
Deflected via machine earth (-> point 1 in Fig.)
or
•
Deflected via earth at the control interface (-> point 6 in
Fig.)
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