West Control Solutions KS98-1 - Manual (Page 23)

I-6 Electrical connections - Safety hints
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Following the safety notes starting on page 6 is indispensable!
The installation must be provided with a switch or power circuit breaker which must be marked accordingly. The
switch must be located near the instrument and readily accessible for the operator.
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When the instrument module is withdrawn from the housing, protection against dropping of conducting
parts into the open housing must be fitted.
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The protective earth terminal (P3) must be connected to the cabinet ground. This applies also to 24V supply.
I-6.1 Electromagnetic compatibility
European guideline 89/336/EEC. The following European standards are met: EN 61326-1.
The unit can be installed in industrial areas (risk of radio interference in residential areas). A considerable increase of
the electromagnetic compatibility is possible by the following measures:
w Installation of the unit in an earthed metal control cabinet.
w Keeping power supply cables separate from signal and measurement cables.
w Using twisted and screened measurement and signal cables (connect the screening to measurement earth).
w Providing connected motor actuators with protective circuitry to manufacturer specifications. This measure pre-
vents high voltage peaks which may cause trouble for the instrument.
I-6.2 Measurement earth connection
Measurement earth connection is required for protection against interference. External interference voltages (incl. ra -
dio frequencies) may affect the perfect function of the device.
To ensure protection against interference, the measurement earth must be connected to cabinet ground.
+ Terminals A11(measurement earth) and P3 (protective earth) must be connected to cabinet ground via a short cable
(approx. 20 cm)! The protective earth conductor of the power supply cable must also be connected to this earth poten -
tial (cabinet ground).
r See also diagram on page 24
9499-040-82711 Electrical connections - Safety hints
Electromagnetic compatibility I-23