🔍 Key Concepts

• Review how multispeed or reduced-voltage starting of a hoist motor is achieved with series resistors and contactors • Compare what happens to armature/rotor circuit resistance when contactors 1A–4A pick up one after another • Distinguish the circuit arrangements for acceleration vs. braking in motor control diagrams

💭 Think About

• When 1A closes, then 2A, 3A, and 4A close in sequence, what is happening to the total resistance in series with the motor? • Does this sequence occur when starting (hoisting) the load, when stopping it, or in both? Trace the path from L1–L3 through the motor and resistor banks. • Which option (accumulation, regenerative braking, dynamic braking, acceleration) best matches a control scheme where resistors are progressively cut out or reconfigured as speed changes?

✅ Before You Answer

• Verify which positions of the master switch (MS 5–MS 8) energize coils 1A–4A in order. • Confirm whether the resistor banks labeled H and L are in the power circuit to the motor during starting, running, or stopping. • Double‑check that regenerative and dynamic braking each require a distinct connection of the motor to either the line or a resistor bank that you can or cannot see here.