Appendix A Optional Accessories
A-3
NOTE
1. Definition for Brake Usage ED%:
Explanation: The definition of the brake usage ED (%) is for assurance of enough time for the brake unit and brake
resistor to dissipate away heat generated by braking. When the brake resistor heats up, the resistance would increase
with temperature, and brake torque would decrease accordingly. Recommended cycle time is one minute.
Definition of Brake Usage ED%
100%
T0
T1
Brake Time
Cycle Time
ED% = T1/T0x100(%)
For safety concern, install an overload relay (O.L) between the brake unit and the brake resistor in conjunction with the
magnetic contactor (MC) prior to the drive for abnormal protection. The purpose of installing the thermal overload relay
is to protect the brake resistor from damage due to frequent brake, or due to brake unit keeping operating resulted from
unusual high input voltage. Under such circumstance, just turn off the power to prevent damaging the brake resistor.
2. If damage to the drive or other equipment is due to the fact that the brake resistors and brake modules in use are not
provided by Delta, the warranty will be void.
3. Take into consideration the safety of the environment when installing the brake resistors. If the minimum resistance
value is to be utilized, consult local dealers for the calculation of Watt figures.
4. When using more than 2 brake units, equivalent resistor value of parallel brake unit can’t be less than the value in the
column “Minimum Equivalent Resistor Value for Each Hybrid Servo Drive” (the right-most column in the table). Please
read the wiring information in the user manual of brake unit thoroughly prior to operation.
5. This chart is for normal usage; if the Hybrid servo drive is applied for frequent braking, it is suggested to enlarge 2~3
times of the Watts.
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