APX A Optional Accessories | VFD-VJ
Apx A-4
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 cannot 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.
6. The position to install brake units needs to be at least 15cm away from the hybrid servo drive.
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