Electrical Installation - Observator Instruments OMC-150 Manual

6.7 Electrical installation

Connections
The OMC-150 anemometer is provided with a plug to connect the sensor (through a junction box) to the
field cabling. The anemometer has a 7-core signal cable with common screen wired to the plug.
connector sensor internal
pin wiring colour
A red
B blue
C orange
D yellow
E black
F brown
G yellow/green
Table 3 Connector wiring
The field cables should be properly supported, and fastened to prevent exerting force on the terminals.
Cable extension
The length of extension cable is limited to a maximum of 240 m cabling in addition to the supplied 5
meters pigtail. A 3-pair instrumentation cable (control signal cable) with individual screened twisted pairs
and a minimum conductor size of 0.75 mm
might apply, dependant on the installation site (e.g. minimum conductor size, halogen content, flame
retardancy, classification, etc.)
The total loop capacitance, loop inductance, and L/R ratio of the installation must be checked not to
exceed the allowed limits (EX installation requirements) using the parameters of the selected cable.
Manual | OMC-150
Status: Final | Not confidential
sensor cable wire speed/
colour direction
white direction potentiometer supply (+3.3V)
brown direction
green direction
yellow direction
grey speed
pink speed
blue
2 and blue outer sheath should be used. Further requirements
description
potentiometer supply (0V)
potentiometer signal 0º
potentiometer signal 90º
NAMUR +
NAMUR -
chassis
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