Accurate measurement capabilities for VSDs
This article describes an instrument which is particularly well suited for use during installation and service of variable-speed motor drives, showing the required readings and providing automatic triggering even on complex modulated drive output signals. The instrument makes analysing V/Hz ratio easier than ever and makes it possible to analyse the behaviour of the system and find possible causes for unstable motor behaviour in the Variable Speed Drive (VSD) configuration.
- Modern VSDs have provided many benefits to users.
- The V/Hz ratio is an important parameter of a VSD and requires that output voltage and frequency are measured simultaneously.
- Measurement devices that are configured specifically to troubleshoot VSDs are available.
Checking voltage frequency ratios on VSDs
By W Thompson, Fluke
Electricity+Control, July 2011 (pgs 20 – 21)