dol starter drawing

Dol Starter Drawing — circuit diagram showing component connectionsMCB Q1Contact K1Overload F1M3~Motor M1Start S1KCoil K1230V AC UtilityDOL (Direct-On-Line) Motor StarterControl circuit (24V)
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The dol starter drawing circuit demonstrates advanced power distribution and automation control principles. This system integrates multiple load branches with coordinated protection, enabling sophisticated industrial and commercial applications. The circuit implements hierarchical protection: a main breaker provides primary protection, individual fuses protect each load branch, and contactors enable remote automation. Component spacing exceeds 100 pixels ensuring PCB manufacturability and technician accessibility. The Manhattan routing protocol maintains horizontal and vertical wire segments exclusively, eliminating diagonal routing. Each branch operates independently while sharing common ground reference, enabling parallel load expansion.

How to wire dol starter drawing

  1. Gather motor and supply specifications Note the motor kW, FLA, voltage, and connection type. Record the supply voltage and available short-circuit current at the distribution board. These inputs drive all component ratings on the drawing.
  2. Draw the power circuit Start with the three-phase supply at the top. Add the isolator, main fuse or MCB, contactor main contacts, and thermal overload relay in series down to the motor terminals M1, M2, M3. Use IEC 60617 symbols.
  3. Draw the control circuit separately Show the single-phase control supply (L1 and neutral or L1 and L2 via control transformer). Place the stop NC button, start NO button, and coil in series. Add the auxiliary NO contact across the start button for latching.
  4. Add the overload trip path Insert the overload relay NC contact in the control circuit in series with the stop button. Label the overload relay contact with the same designation (e.g. FR1) as the overload relay on the power circuit drawing.
  5. Number all terminals Assign terminal numbers to every wire end. Use the SANS 10198 convention: control wires in the 100-series, power wires in the 200-series. This makes panel assembly and fault-finding far quicker on site.
  6. Add title block and revision information Include client name, project number, drawing number, revision, date, and the name of the person who drew and checked the diagram. A drawing without a title block is useless during a SAIEE or DoL inspection.
  7. Review against SANS 10142-1 Check that cable sizes, fuse ratings, and component specifications comply with SANS 10142-1 Table values. Note any deviations with an engineering justification in the drawing notes.

Frequently asked questions

What is the difference between a DOL starter drawing and a wiring diagram?

A DOL starter drawing typically refers to the schematic or line diagram showing circuit logic. A wiring diagram shows actual physical terminal-to-terminal connections. Both are needed on site — the schematic for fault-finding, the wiring diagram for installation.

Do I need separate power and control drawings for a DOL starter?

Yes. The power circuit drawing shows the three-phase path from supply through contactor and overload to the motor. The control circuit drawing shows the start/stop buttons, latching contact, and coil wiring. Keeping them separate prevents confusion during fault-finding.

What IEC symbols are used in a standard DOL starter drawing?

Common IEC 60617 symbols include the normally open contact for the main contactor, the normally closed contact for the overload relay, the coil symbol, and push-button symbols. SANS 10198 references IEC 60617 for South African industrial drawings.

Can a DOL starter drawing be used for single-phase motors?

A single-phase DOL starter uses the same logic but with a single-pole contactor and a run capacitor for the motor. The control circuit wiring is identical. The power circuit drawing changes to show only live and neutral rather than three phases.

Where should I keep the DOL starter drawing once installed?

Laminate a copy and fix it inside the panel door. Keep the original electronic file backed up. The Occupational Health and Safety Act and SANS 10142-1 require that as-built drawings are available for inspection and maintenance purposes.

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