Delta VFD300C43S-HS User Manual page 75

1. Select the resistance value, power and brake usage (ED %) according to Delta rules.
Definition for Brake Usage ED %
For safety, install a thermal overload relay (O.L.) between the brake unit and the brake resistor in
conjunction with the magnetic contactor (MC) prior to the drive for additional protection. The thermal
overload relay protects the brake resistor from damage due to frequent or continuous braking. Under such
circumstances, turn off the power to prevent damage to the brake resistor, brake unit and drive.
2. Any damage to the drive or other equipment caused by using brake resistors and brake modules that are
not provided by Delta voids the warranty.
3. Consider environmental safety factors when installing the brake resistors. If you use the minimum
resistance value, consult local dealers for the power calculation.
4. When using more than two brake units, the equivalent resistor value of the parallel brake unit cannot be
less than the value in the column "Minimum Resistor Value (Ω)" (the right-most column in the table). Read
Chapter 7 Optional AccessoriesC2000-HS
Figure 7-2
7-3
Table 7-2
Figure 7-2