Endress+Hauser EngyVolt RV12, Operating Instructions Manual

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Wiring EngyVolt RV12
10
4 Wiring
! WARNING
Danger! Electric voltage!
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The entire electrical connection must be performed when the device is de-energized.
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Establish the protective ground connection before making any other connections.
NOTICE
Cable heat load
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Use suitable cables for temperatures that are 5 °C (9 °F) above the ambient
temperature.
Incorrect supply voltage can damage the device or cause malfunctions
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Before commissioning the device, make sure that the supply voltage matches the
voltage specifications on the nameplate.
Incorrect wiring can damage the device
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Observe the terminal designations on the device.
Electrical overloading can damage the device
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Provide overcurrent protection elements for the power cables.
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Provide a suitable switch or power-circuit breaker for emergency shutdown in building
installations. This switch must be provided close to the device (within easy reach) and
marked as a circuit breaker.
4.1 Supply voltage
The supply voltage is designed for the range from 100 to 400 V AC and 120 to 350 V DC.
Preferably, the supply voltage should be provided from a source other than the measured
voltage. The measured voltage can be used if it is within the tolerance limits of the supply
voltage.
4.2 Electrical connection
To ensure maximum accuracy, we recommend that the current signal connecting cables
pass through additional ferrite cores (e.g. of type 742 701 110 from Würth Elektronik) at
least six times.