Application Example For Kl3403-0014 - Beckhoff KL3403 Series Documentation

Mounting and wiring
3.4.4

Application example for KL3403-0014

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.
Fig. 21: Application example for 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.
36
WARNING
Version: 3.1.0 KL3403