What you'll learn
Build both halves of a direct-on-line starter: the three-phase power path through isolator, breaker, contactor and thermal overload to the motor, plus the 24 V three-wire Start/Stop control circuit with overload trip contact and seal-in.
Lab time: ~24 minutes.
Lesson briefing
Complete DOL Motor Starter
Build both halves of a direct-on-line starter: the three-phase power path through isolator, breaker, contactor and thermal overload to the motor, plus the 24 V three-wire Start/Stop control circuit with overload trip contact and seal-in.
Why it is wired this way
The overload power poles measure motor current, while auxiliary NC contact 95–96 opens the coil circuit on trip. The contactor auxiliary NO 13–14 bypasses only the momentary Start button, never the Stop or overload contacts.
Commissioning standard
Before energising, prove protective earth and continuity, verify the drawing terminal-by-terminal, then energise through the protective device and measure the expected supply, signal and return values. Never use this training panel as a substitute for the machine manufacturer’s instructions, risk assessment, isolation procedure or applicable electrical standard.
Hints
Trace all three phases in the same order through Q0, QF1, KM1 and OL1 to M1.
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This lesson uses 11 placed components on the lab canvas. Components are vendor-neutral (no proprietary trademarks); the wiring rules apply to any equivalent industrial part.
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