Leeson SCR Thyristor Motor Control Manual de usuario descargar pdf (Pagina 40)

Operation SPEEDMASTER™ OPERATION MANUAL

Sizing the dynamic brake resistor

Size the dynamic brake resistor according to the motor current

rating (Table 3). The dynamic brake resistance listed in the table

is the smallest recommended resistance allowed to prevent

possible demagnetization of the motor. The motor stops less

rapidly with higher brake resistor values.

Table 3. Recommended Dynamic Brake Resistor

Sizes

Minimum Minimum

Motor Armature Dynamic Brake Dynamic Brake

Current Rating Resistor Value Resistor

Wattage

Less than 2 ADC 1 ohm 1W

2–3 ADC 5 ohm 5W

3–5 ADC 10 ohm 10W

5–10 ADC 20 ohm 20W

10–17 ADC 40 ohm 50W

For motors rated 1/17 horsepower and lower, a brake resistor is

not necessary since the armature resistance is high enough to

stop the motor without demagnetization. Replace the dynamic

brake with 12 gauge wire.

NOTE: Models 174105, 174308 and M1740006 are factory-

equipped with dynamic braking.

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Leeson SCR Thyristor Motor Control Manual de usuario Pagina 40