Delta C2000 Series User Manual page 84

2
*
Please refer to the Brake Performance Curve for "Operation Duration & ED" vs. "Braking Current".
3
*
For heat dissipation, a resistor of 400W or lower should be fixed to the frame and maintain the surface temperature below
50 ; a resistor of 1000W and above should maintain the surface temperature below 350 .
4
*
Please refer to VFDB series Braking Module Instruction for more detail on braking resistor.
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.
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.
NFB
R/L1
S/L2
T/L3
O.L.
MC
S A
Varistor
Thermal relay
or Temperature Switch
Trip Contact
When AC Drive is equipped with a DC reactor, please read user manual to know the wiring
method of input circuit of brake unit +(P)
Do Not connect input circuit –(N) to the neutral point of the power system.
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 AC 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 AC motor drive is applied for frequent braking, it is suggested to
enlarge 2~3 times of the Watts.
6. Thermal Relay:
Thermal relay selection is basing on its overload capability. A standard braking capacity for C2000 is
10%ED (Tripping time=10s). The figure below is an example of 406V, 110kw AC motor drive. It requires
V FD
MC
R/L1
U/T1
S/L2
V/T2
T/L3
W/T3
+(P)
- (N)
+
(P)
Brake unit
VFDB
XXXX
MASTER
Chapter 7 Optional Accessories
MOTOR
IM
T hermal relay
-
B1
(N)
Brake
O.L.
Resistor
B2
MASTER
M1 M2 Temperature
switch
7-3
T hermal relay
-
+
B1
(P) (N)
Brake
O.L.
Resistor
Brake unit
VFDB
XXXX
B2
22 Parallel Serie
M1 M2
Temperature switch