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DMV-100 Rotor Creep and Speed Detector - Installation Manual
2. INSTALLATION OF THE VM 3.12 AIR GAP SENSOR
FOR MOVEMENT DETECTION
2.1 Preliminary considerations
•
The VM 3.12 sensor is a flat, non-contact sensor using
capacitive technology to measure the distance from its face
to a target (typically, rotor poles in rotating electrical
machinery).
•
A single air gap sensor is needed for movement detection.
The purpose of the movement detection system is solely to
sense the passage of poles, regardless of the position of
the rotor. The sensor may therefore be installed at any
angular position.
•
A triaxial extension cable connects the sensor to a signal
conditioning module. The output produced by the module is
a linearized 4 to 20 mA signal which can be sent to an
acquisition unit, control unit, or any other instrument.
•
The sensor detecting surface must be parallel to the target
surface. The sensor must be glued against the stator
laminations at a position where it will face the plane area of
the rotor poles, usually beneath the second ventilation hole.
Figure 2 : VM 3.12 Air Gap Sensor
•
The length of the integral cable (50 cm
[19.7 in.]
) limits the depth at which the sensor can be glued, as
the connector must remain outside the airgap.
•
The integral cable must also be glued to the stator, and covered with a bead of silicone for protection.
Warning - Danger
Caution
•
Integral cables must be installed on the stator core or a grounded surface to avoid disrupting the
equipotential.
•
Never install triaxial cables on high voltage components.
•
Never install the sensor over a wedge, always install on stator core laminations.
•
Avoid using silicone or PVC based products and components when installing the sensors in an
hydrogen-cooled machine.
•
Handle the sensor with great care.
•
Never pull on the triaxial cable or on the connector.
•
Do not apply paint or silicone on the sensor sensing surface.
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