Application example for KL3403-0014
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Risk of injury through electric shock and damage to the device! Bring the Bus Terminals system into a safe, de-energized state before starting mounting, disassembly or wiring of the Bus Terminals! |
The KL3403-0014 has no internal shunts for current measurement. It allows the use of external shunts. Instead of the three current circuits, the additional voltage circuits UI1, UI2 and UI3 are available for this purpose.
Connection
Cables are used to connect the voltage drop at the external shunts to terminal points UI1, UI2 and UI3 of the KL3403-0014.
The example shows a power measurement for three incandescent lamps. Three external shunts are used for the current measurement.
 | Voltage drop on the cables between the shunts Note that the voltage drop on the cables between the shunts (shown in red in the diagram) distorts the measurement. It is therefore imperative that short cables with large cross-sections and as low-resistance as possible are used for these connections, in order to keep the measuring error to a minimum. Otherwise the measuring errors could be significant, since the voltage drop on this cables can be comparatively high and could result in a large error in the power calculation. |
Dimensioning of the shunts
A voltage drop of 60 mV / x A is typically indicated for the shunts.
Examples
Nominal value of the shunt | 60 mV / 1 A | 60 mV / 25 A | 60 mV / 100 A |
Sample current | 1 A | 25 A | 100 A |
Current output value of the terminal | 25000dec (0x61A8) | 25000dec (0x61A8) | 25000dec (0x61A8) |