It sounds like you’re referring to a specific Czech technical document: (Electrical schematics and wiring in practice 1) — likely a textbook or lab manual for vocational or university-level electrical engineering.
If the lamp turns ON but motor does NOT run → suspect OL contact miswired: it interrupts lamp path but not K1. Based on field service reports from automotive and HVAC industries (2015–2025): elektrotechnicka schemata a zapojeni v praxi 1 pdf
| Error | Cause | Detection method | |-------|-------|------------------| | | Forgot seal-in contact | Press Start → motor runs only while holding button | | Overload in wrong phase | OL placed on neutral side | Single-phasing → motor burns | | Wire cross-reference mismatch | Terminal X1 labeled K1(13) but physically connected to wrong K2 | Continuity test + schematic comparison | | Auxiliary contact welded | High inrush current | Check with multimeter (coil de-energized) | 7. From Schematic to Physical Panel: A Formal Mapping Given a ladder rung: ---[S1]---[K1 coil]--- It sounds like you’re referring to a specific
| Component | IEC symbol feature | ANSI equivalent | |-----------|----------------|----------------| | Normally open contact | ——/ —— | -] [- | | Normally closed contact | ——/\ —— (with slash) | -]/[- | | Relay coil | Rectangle with label K1 | Circle with label CR1 | | Thermal overload relay | Two bent lines (bimetal) | Square with “OL” | From Schematic to Physical Panel: A Formal Mapping