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Works with PWM drive outputs (high-frequency, non-sinusoidal waveforms)
4–20 mA output (analog signal)
Operates on 24V DC power
Compact and supports true RMS measurement (for all waveforms).
CR4120 - We have came across this model for the above requirement. Also when we checked the datasheet of this CR4100 series, it is mentioned to extend the range 5A secondary CT is required to add. can you explain on this?
The CR4100 dataheet does not mention high frequency and VFD use. Instead:
these devices are ideal in chopped wave and phase fired control systems.
This is a relatively low frequency operation associated with thyristors (SCRs) where the current for parts of a 60 Hz signal is measured.
Instead, you may be interested in this sensor as the datasheet does specify VFD operation.
Related thoughts:
The motor will generally look like an inductor. This will tend to smooth out the VFD’s pulsation.
We can use a high current sensor to measure a smaller current by passing the wire through the senser aperture multiple times as described in this article:
Please let us know if you would like to continue exploring your application.
