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Appendix B Accessories| BLD-E1 Series
B-2
Revision May 2009, 00DE, V0.50
NOTE
1. If damage to the drive or other equipment is due to the fact that the brake resistors and
the brake modules in use are not provided by Delta, the warranty will be void.
2. Take into consideration the safety of the environment when installing the brake resistors.
3. Definition for Brake Usage ED%
Explanation: The definition of the barking 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. Suggested cycle time is one minute
100%
T0
T1
Brake Time
Cycle Time
ED% = T1/T0x100(%)
4. Please select the brake unit and/or brake resistor according to the table. “-“ means no
Delta product. Please use the brake unit according to the Equivalent Resistor Value.
5. For safety reasons, install a thermal overload relay between brake unit and brake resistor.
Together with the magnetic contactor (MC) in the mains supply circuit to the drive it offers
protection in case of any malfunctioning. The purpose of installing the thermal overload
relay is to protect the brake resistor against damage due to frequent brake or in case the
brake unit is continuously on due to unusual high input voltage. Under these
circumstances the thermal overload relay switches off the power to the drive. Never let
the thermal overload relay switch off only the brake resistor as this will cause serious
damage to the brushless DC motor drive.
R/L1
S/L2
T/L3
NFB
MC
BLD
MOTOR
O.L.
U/T1
V/T2
W/T3
+P
-N
()
()
B1
B2
SA
R/L1
S/L2
T/L3
MC
IM
BR
O.L.
Thermal
Overload
Relay or
temperature
switch
Surge
Absorber
Thermal Overload
Relay
Brake
Resistor
Brake
Unit
+P
-N
()
()
Note1: When using the drive with DC reactor, please refer to wiring diagram in the drive
user manual for the wiring of terminal +(P) of Brake unit.
Note2: wire terminal -(N) to the neutral point of power system.Do NOT
Temperature
Switch