YASKAWA SGD7S-xxxDA0 series Product Manual

Contents

5.3 SERVOPACK Models without a Built-In Dynamic Brake5.3.2 Selecting the Devices Required for the Dynamic Brake Circuit5-125.3.2 Selecting the Devices Required for the Dynamic Brake CircuitYou must select the resistor, Magnetic Contactor, and relay to create the dynamic brake circuit.Selecting the Dynamic Brake ResistorTo select the Dynamic Brake Resistor, you must calculate the resistance and energy consump-tion for the specifications of the machine. ResistanceBased on the characteristic graphs of the Servomotor that will be used, you must determinethe resistance that can satisfy the limit of instantaneous maximum brake torque.If it is not necessary to reduce the brake torque, select a Dynamic Brake Resistor with the fol-lowing resistance. SGD7S-210D to 370D SERVOPACKs differ from SGD7S-1R9D to 170D inthat three Dynamic Brake Resistors are required. Use resistors with the same resistance andcapacity for the three Dynamic Brake Resistors. The following table gives the resistance perresistor.If it is necessary to reduce the brake torque, determine the resistance based on the character-istic graphs.The following graphs show the relationship between the instantaneous maximum brake torqueof the Servomotor and the resistance of the Dynamic Brake.WARNING Do not use dynamic braking for any application other than an emergency stop.There is a risk of failure due to rapid deterioration of elements in the SERVOPACK and the riskof unexpected operation, machine damage, burning, or injury. Use a Dynamic Brake Resistor matched to the specifications of the machine.There is a risk of unexpected operation, machine damage, burning, or injury. When using dynamic braking, implement suitable safety measures on the machine.There is a risk of unexpected operation, machine damage, burning, or injury. In situation where the motor will be rotated from the machine after it has been stopped, setthe SERVOPACK to coast to stop instead of using dynamic braking.There is a risk of burning in the equipment, damage to the machine, or injury.CAUTION Do not select a resistor with resistance less than the minimum allowable resistance.There is a risk of burning in the SERVOPACK or Servomotor, damage to the machine, or injury.Model Minimum Allowable Resis-tance (±5%)SGD7S -210D, -260D 1.1 Ω-280D, -370D 0.95 Ω