Electric Motor Control Walter N Alerich Pdf [patched] May 2026

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4. Reversing and Jogging Circuits

How do you reverse a three-phase motor? Swap two lines. How do you do it safely? Alerich introduces the mechanical interlock and electrical interlock. He explains why you cannot have the forward and reverse contactors energized at the same time (a "cross fire" that causes a catastrophic short circuit). Electric Motor Control Walter N Alerich Pdf

1. Master the Schematic Symbols

The first three chapters of the PDF are the most critical. Alerich dedicates significant space to NEMA (National Electrical Manufacturers Association) symbols. Print these pages out. You should be able to look at a symbol for a pressure switch, a float switch, a normally closed contact, or a timing relay and know its function instantly. Here are a few options for content surrounding

Can You Get a Free PDF?

Short answer: Not legally.

While some outdated editions may float around file-sharing sites, those are often: Poor quality scans Missing pages Copyright infringing (which

• Poor quality scans
• Missing pages
• Copyright infringing (which hurts the publisher and author’s estate)

✅ Legal ways to access it:

1. Internet Archive (Open Library) – Sometimes has older editions to borrow digitally.
2. Your local college library – Many tech schools still keep Alerich on their shelves.
3. Used bookstores – Older hardcover editions are often $10–20.
4. Cengage / Delmar – The current publisher (if still in print or as an e-book).

What Makes This Book So Good?

• Clear, practical diagrams – Ladder logic, wiring schematics, and starting circuits are explained visually.
• Real-world focus – Covers manual & magnetic starters, overload relays, reversing circuits, and reduced-voltage starting.
• Classic fundamentals – Even with VFDs and PLCs today, the core principles of contactors, relays, and safety circuits remain the same.

Electric Motor Control — Walter N. Alerich (PDF)

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