Chapter 5 introduces the tie-down troubleshooting method, a systematic way to use a Digital Multimeter (DMM) to isolate faults—a must-master for any control circuit technician. 3. Supplementing Your Study
The 5th Edition includes expanded coverage of NFPA 70E electrical safety, arc‑flash hazards, and smart grid systems—topics that have only grown in importance since 2014. For the most current code references, however, you should always supplement the textbook with the latest National Electrical Code (NEC) edition. ATP publishes NEC resources that pair well with this textbook. Chapter 5 introduces the tie-down troubleshooting method, a
Separate the high-voltage power circuit from the low-voltage control logic. For the most current code references, however, you
Confirm the system receives stable voltage before looking for broken internal parts. Confirm the system receives stable voltage before looking
One of the most frequent sources of confusion in the 5th Edition involves the connection of control transformers.
Voltage unbalance between phases should not exceed 1%. Unbalanced voltage causes high current unbalance, leading to rapid motor overheating. Check for loose terminal connections in the junction box.
If the drive experiences frequent overvoltage faults due to utility power surges, install an incoming line reactor to smooth out the power.
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