Definition For Brake Usage Ed% - Delta C2000 series User Manual

Chapter 7 Optional Accessories C2000 Series
460V
Applicable
Motor
Braking
Torque Brake
HP kW
(kg-m) Unit
125 90 60.9 4045*2 BR1K5W013*4
150 110 74.5 4110*1 BR1K2W015*10
175 132 89.4 4160*1 BR1K5W012*12
215 160 108.3 4160*1 BR1K5W012*12
250 185 125.3 4185*1 BR1K5W012*14
300 220 148.9 4110*2 BR1K2W015*10
375 280 189.6 4160*2 BR1K5W012*12
425 315 213.3 4160*2 BR1K5W012*12
475 355 240.3 4185*2 BR1K5W012*14
1
*
Calculation for 125% brake toque: (kw)*125%*0.8; where 0.8 is motor efficiency.
Because there is a resistor limit of power consumption, the longest operation time for 10%ED is 10sec (on: 10sec/ off: 90sec).
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.
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.
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.
1
* 125%Braking Torque 10%ED
3
* Braking Resistor series for
each Brake Unit
2 parallel,
2 series
5 parallel,
2 series
6 parallel,
2 series
6 parallel,
2 series
7 parallel,
2 series
5 parallel,
2 series
6 parallel,
2 series
6 parallel,
2 series
7 parallel,
2 series
Resistor
Total
value spec.
Braking
for each AC
Currnet (A)
motor Drive
12000W6.5Ω 117
12000W6Ω 126
18000W4Ω 190
18000W4Ω 190
21000W3.4Ω 225
24000W3Ω 252
36000W2Ω 380
36000W2Ω 380
42000W1.7Ω 450
7-2
2
* Max. Brake Torque
Min. Max. Total Peak
Resistor Braking Power
Value (Ω) Current (A) (kW)
6.3 120
6.0 126
4.0 190 144.4
4.0 190 144.4
3.4 225 172.1
3.0 252 190.5
2.0 380 288.8
2.0 380 288.8
1.7 450 344.2
℃
91.2
95.8