METSO IOP101 Processor module

Resistance Value Calculation The required load resistance per phase to produce the most effective braking torque can be calculated using the following formula: Load resistance = 0.013 x Inductance x No of poles x Max Speed in rpm Where Inductance is the line-to-line inductance measured in Henrys No of poles is equal to the number of motor poles Max Speed is the maximum required running speed measured in rpm Load resistance is the total circuit resistance including the motor

Resistor Power Rating

 The power rating and thermal capacity of the load resistors will depend upon the total inertia of the system. To a first approximation the total power to be dissipated can be estimated by calculating the total energy in the system. For example, taking the worst case condition where the load has an inertia of ten times the inertia of the motor: For the HDX142C6-88S the motor inertia is 0.00115 kgm2 Assuming a load inertial of 0.0115 kgm2 Total inertia = 0.0126 kgm2

The time taken for the motor to slow down

 will depend upon its maximum speed, the total inertia of the system and the braking torque applied by the resistive load.For the HDX142C6-88S the maximum torque (at the centre speed of 1,500rpm) is 13 Nm. Using the calculated time the motor should come to rest in approximately 0.8s. Generally, power resistors have an overload rating of five times the normal wattage rating over a period of 5 seconds. As the time taken for the motor to come to rest is less than 1 second and the total power to

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