Introduction

The 3-phase Power Measurement Terminal KL3403 enables the measurement of the electrical data of a three-phase supply network:

The voltage is measured via the connection of the network at the terminal points L1, L2, L3 and N.
The current of the three phases is fed in via current transformers at the terminal points I_L1, I_L2, I_L3 and I_N.

Non-sinusoidal voltage and current curves can also be read in with a practical accuracy of 1 % to 5 %, depending on the shape of the curve. The limit frequency of the calculations amount to 2 kHz. As the time interval for calculating the values can be adjusted, optimization is possible under a very wide range of circumstances.

Pre-processing of the KL3403 provides rms values in the process image, without requiring high computing power on the controller. From the effective values for voltage (U) and current (I), the KL3403 calculates the active power (P), the energy consumption (W) and the power factor (cos φ) for each phase. From these values the apparent power (S) and the phase shift angle (j), for example, can easily be derived.

The KL3403 thus enables a comprehensive network analysis to be carried out via the fieldbus. Based on the values for voltage, current, active power, apparent power and loading condition, the plant operator can optimize the supply of a drive or a machine and protect the plant from damage and downtime.

Versions

Several variants of the KL3403 are available.

Name	Comment	Nominal value
KL3403-0000 KS3403-0000	Standard version	1 A
KL3403-0026	Like KL3403-0000, but without EMC leakage capacitor between terminal points 4/8 and the grounding contact for the mounting rail.	1 A
KL3403-0010 KS3403-0010	Power measurement terminal with higher-capacity current circuits.	5 A
KL3403-0014	Power measurement terminal with 3 additional voltage circuits instead of the current circuits. For connecting external shunts.	60 mV
KL3403-0020	Power measurement terminal with more sensitive current circuits.	20 mA
KL3403-0022	Power measurement terminal with 6 current circuits, otherwise like KL3403-0020.	20 mA
KL3403-0025	Power measurement terminal with more sensitive current circuits.	250 mA
KL3403-0333	Power measurement terminal designed for usage with 333 mV transformers.	max. 333 mV (AC), via current transformer xA / 333 mV

Further details can be found in chapter Technical data.