Selecting The Devices Required For The Dynamic Brake Circuit - YASKAWA SGD7S-xxxDA0 series Product Manual

5.3 SERVOPACK Models without a Built-In Dynamic Brake

5.3.2 Selecting the Devices Required for the Dynamic Brake Circuit

5.3.2

Selecting the Devices Required for the Dynamic Brake Circuit

You must select the resistor, Magnetic Contactor, and relay to create the dynamic brake circuit.
Selecting the Dynamic Brake Resistor
To select the Dynamic Brake Resistor, you must calculate the resistance and energy consump-
tion for the specifications of the machine.
 Resistance
Based on the characteristic graphs of the Servomotor that will be used, you must determine
the 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 in
that three Dynamic Brake Resistors are required. Use resistors with the same resistance and
capacity for the three Dynamic Brake Resistors. The following table gives the resistance per
resistor.
SGD7S
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 torque
of the Servomotor and the resistance of the Dynamic Brake.
5-12
 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 risk
of 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, set
the 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.
 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
-210D, -260D
-280D, -370D
WARNING
CAUTION
Minimum Allowable Resis-
tance (±5%)
1.1 Ω
0.95 Ω