Figure 18: Power Measurement On Two Motors Regulated By Frequency Converters; 3-Phase Power Measurement Module - WAGO 750-494 Series Manual

WAGO-I/O-SYSTEM 750

750-494 3-Phase Power Measurement Module

Figure 18: Power Measurement on Two Motors Regulated by Frequency Converters

The galvanic separation achieved by the 3-phase transformer (Yy0) allows
measurement after the frequency converter.
CAGE CLAMP
Based on the galvanic separation by the 3-phase transformer, you must ground
CAGE CLAMP
voltage in the event of a current transformer fault.
Transformation ratio 1:1 !
The three-phase transformer must have a transformation ratio of 1:1 and may not
produce any phase shifting in the supply network (Yy0)!
As the high-frequency portions only have a minor effect on the motors, distortion
caused by the 3-phase transformer during transmission of the harmonic waves
generated by the frequency converter will have virtually no effect on practical
measurement.
Distribution of the power is mapped very well, thanks to the use of one I/O
module for each motor. This also allows to detect elevated current consumptions
by every single motor at an early stage.
Manual
Version 1.2.0
®
N must be connected to earth!
®
N of the I/O modules to prevent any excessive, hazardous
Connect Devices 77