The iFlex™ probe surrounds a single conductor in this drive cabinet for an air handler unit (AHU). The Fluke 381 Clamp Meter is used to record the amperage reading to troubleshoot a suspected drive problem. The same clamp meter is used to estimate the hor...
TECHNICAL NOTE:If you need more information about wire conductor size, please see ourFAQ section on wire. Specifically, take a look at thearticle on voltage loss tables and ampacity for AWG wire sizes. A roof-mounted system will also use a combiner box. It serves the same functi...
Consult ampacity tables to determine appropriate widths based on temperature rise, copper weight, and other factors. When in doubt, go thicker. Distribute Across Layers Use multiple board layers with entire planes dedicated to power distribution. This divides current to avoid overloading individual tra...
The conductor system, i.e., bushings and wire sizes, help determine a design ampacity. The cooling system, air-cooled or oil-cooled, is also used to determine the ampacity of the transformer. Unless indicated otherwise, transformers are rated for a load factor of 100%. The current flowing ...
Select compatible high-quality connectors to match cable type and system interfaces. Circuit Configuration Plan conductor grouping, shielding, and grounding paths based on circuit logic and noise susceptibility. Length Determine required cable lengths for equipment placement and allow extra slack if systems...
The motor thermal protection is based on a calculated model which uses the output current of the drive to determine the load on the motor. The thermal current IT specifies the load current above which the motor is overloaded. See figure 10.5.1-1. If the motor current is above the curve,...