BECKHOFF KL3403, KS3403: Mounting and wiring

Application examples for AC

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WARNING
Risk of electric shock and damage of device!
Bring the bus terminal system into a safe, powered down state before starting installation, disassembly or wiring of the Bus Terminals!
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CAUTION
Operate current transformers as intended
Please note that many manufacturers do not permit their current transformers to be operated in no-load mode!
Connect the KL3403 to the secondary windings of the current transformers before using the current transformer!

Power measurement at a machine

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Attention
Avoid confusing the current and voltage circuit!
Avoid confusing the current and voltage circuit during connection, since the direct connection of mains voltage to the terminal points for the current transformers (typical input resistance 33 mW) would destroy the power measurement terminal!

KL3403_Appl

 

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Note
Polarization of the current transformers
If negative power values are measured on a circuit, please check whether the associated current transformer circuit is connected correctly.

Current measurement on a motor

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CAUTION
Connect terminal point N to the neutral conductor of your mains supply or earth it!
If you do not connect the terminal point N with the neutral conductor of your mains supply (e.g. if the KL3403 is used purely for current measurements), terminal point N should be earthed, in order to avoid dangerous overvoltages in the event of a current transformer fault!

KL3403_Appl2