Application examples for alternating current
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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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Operate the current transformer 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
- The voltage is measured via connections L1, L2, L3 and N.
- The current is measured via three current transformers and the connections IL1, IL2, IL3 and IN (star point of the current transformers).
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Do not confuse 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 mΩ) would destroy the power measurement terminal! |
Fig.17: Application example - power measurement at a machine | Polarity 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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Make sure terminal point N is zeroed or grounded! 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! |
Fig.18: Application example - current measurement at a motor