Power analyser add-ons stream data for motors and flicker testing
“The DS option centres on waveform data streaming, while the focus of G7 option is IEC harmonic, voltage fluctuation and flicker testing,” said the company. “In addition, a firmware version is released that offers Modbus/TCP and raw socket communication, a navigation settings menu, webserver functions and the evaluation of multi-phase motor control.”
Users of the DS option can stream waveform data to a PC at up to 2Msample/s. Voltage and current waveforms as well as motor signals can be streamed, allowing engineers to study transient behaviour simultaneously when measuring efficiency or energy consumption.
The waveform data is streamed without gaps, can be combined, and is synchronised with numerical data – abnormal findings in the numerical data can be directly linked and evaluated in the waveform data.
The G7 option, in combination with harmonic, voltage fluctuation and flicker test software, allows data to be saved to a PC for assessment according to IEC61000-3-3 – the IEC standard which specifies limits of voltage changes which may be produced by an equipment tested under specified conditions. “This action will show a trend of parameters such as DC, dmax and Pinst – instantaneous flicker sensation,” according to the company.
From the firmware upgrade, Modbus/TCP and raw socket communication enables connection between the WT5000 and Yokogawa recorder/PLC products, while the navigation setting menu and gain/phase correction functions support the use of external current sensors. Yokogawa said: “Easy monitoring and operating of the WT5000 from a PC is facilitated by the company’s newly developed webserver functionality.”
With the multi-phase motor control changes, there are now presets amongst the user-defined computation settings to measure field-oriented control parameters for inverters – so the evaluation of motor control to take place simultaneously with motor efficiency measurements.
The power analyser is accurate to ±0.03%. “WT5000 is the flagship model of our power analyzer WT series,” said Yokogawa sales v-p Terry Marrinan.