VFD Brake Unit 220V/380V/660V Dynamic Braking
The universal brake unit (also called braking chopper) is a high-performance dynamic braking solution for VFDs using advanced IGBT power devices and MCU digital control. Working with braking resistors, it dissipates regenerative energy generated during motor deceleration, ensuring sufficient braking torque and protecting the inverter's DC bus. Compatible with all brands of 220V, 380V, and 660V frequency converters. Featuring digital current sharing, LED keyboard control, and comprehensive protection, it is ideal for CNC machines, elevators, cranes, centrifuges, and pumping systems requiring reliable braking performance
Power range
220V、380V、660VAC
Input voltage
50Hz±5Hz
Product Overview
Application scope
-
CNC
-
Elevator
-
mine
-
centrifuge
-
Lifting
-
Food
-
Fans
-
Pumps
- Adapt to all brands of frequency converters with voltages of 220V, 380V, and 660V, with a single machine power of up to 400KW;
- Digital control, complete current sharing from parallel within 8 units;
- High power LED keyboard control for more convenient operation;
- Three specifications of the same power are available, with a rich product line to meet customers with different cost-effectiveness requirements;
- Protection function, strong anti-interference function, and high reliability.
A. Working Principle Description:
The braking unit (also known as a braking chopper or dynamic braking unit) works in conjunction with a braking resistor to dissipate the regenerative energy generated when the VFD decelerates the motor. When the DC bus voltage exceeds a threshold, the IGBT turns on, transferring excess energy to the resistor.
B. Selection Guide: How to select the correct braking device:
1. Matching voltage: 220V, 380V, or 660V to the VFD
2. Calculate braking power based on load inertia and deceleration time
3. Select resistor value and power (see selection table)
4. For high duty cycles, use multiple units in parallel (up to 8 units).
C. Detailed Application Scenarios:
CNC Machine Tools: Emergency stop braking to prevent tool damage
Elevator: Smooth stopping and safe braking
Crane: Heavy load descent control to prevent hook slippage
Centrifuge: Rapid deceleration to improve production efficiency
Fan/Pump: Rapid shutdown to avoid water hammer
Technical Specifications
| Item | Specification | |
| Power supply | Power Voltage | 3AC 220V,380V,460V,660V±10% |
| Power network frequency | 50Hz±5Hz | |
| Contorl system | Braking device | Dynamic voltage tracking |
| Response time | ≤1ms | |
| Hysteresis voltage | ≤10V | |
| Current protection | Over-pressure and over-temperature(over 85°C-RRB-protection） | |
| Fault output | Relay contact output: capacity AC250V/3A | |
| Display | Status display | Power supply voltage，operating state，fault state（high-end H-type） |
| Operation display | Operation Indicator Light is always bright or flashing（high-end H-type） | |
| Parameter setting | Action voltage setting, master-slave setting (high-end H-type） | |
| Environmental condition | Field-of-Use | Indoor, free from direct sunlight, dust, corrosive gases, flammable gases, oil mist, water vapor, dripping water, or salt. |
| Ambient temperature | -10℃―+45℃, excellent ventilation | |
| Ambient humidity | ＜90%RH，No condensation | |
| elevation above sea level | ＜1000m（over 1000m，1% decrease per 100m） | |
| Vibration | ＜0.5g | |
| Storage temperature | -20℃―+60℃ | |
| Cooling method | Forced air cooling | |
| Class of protection | IP00 | |
Model Selection Guide
| AC 220V grade usage specifications and selection reference | |||||
|
Variable frequency drive capacity |
BRAKE UNIT |
Braking resistor (100% braking torque, 10% utilization rate) | |||
| Specifications | Quantity (pieces) | Equivalent braking resistance value | Equivalent braking power | Quantity (pieces) | |
|
1.5（2） |
built-in |
1 |
130Ω |
260W |
1 |
|
2.2（3） |
1 |
80Ω |
260W |
1 |
|
|
4（5） |
1 |
48Ω |
400W |
1 |
|
|
5.5（7.5） |
1 |
35Ω |
550W |
1 |
|
|
7.5（11） |
1 |
26Ω |
780W |
1 |
|
|
11（15） |
1 |
17Ω |
1100W |
1 |
|
|
15（20） |
1 |
13Ω |
1800W |
1 |
|
|
18.5（25） |
FST-055-ST2 |
1 |
10Ω |
2000W |
1 |
|
22（30） |
1 |
8Ω |
2500W |
1 |
|
|
30（40） |
FST-055-ST2 |
2 |
13Ω |
1800W |
2 |
|
37（50） |
2 |
10Ω |
2000W |
2 |
|
|
45（60） |
2 |
8Ω |
2500W |
2 |
|
|
55（75） |
2 |
6.5Ω |
3000W |
2 |
|
| AC 380V grade usage specifications and selection reference | |||||
|
Variable frequency drive capacity |
BRAKE UNIT |
Braking resistor (100% braking torque, 10% utilization rate) | |||
| Specifications | Quantity (pieces) | Equivalent braking resistance value | Equivalent braking power | Quantity (pieces) | |
|
1.5（2） |
built-in |
1 |
400Ω |
260W |
1 |
|
2.2（3） |
1 |
150Ω |
390W |
1 |
|
|
4（5） |
1 |
150Ω |
390W |
1 |
|
|
5.5（7.5） |
1 |
100Ω |
520W |
1 |
|
|
7.5（11） |
1 |
50Ω |
1040W |
1 |
|
|
11（15） |
1 |
50Ω |
1040W |
1 |
|
|
15（20） |
1 |
40Ω |
1560W |
1 |
|
|
18.5（25） |
1 |
20Ω |
6000W |
1 |
|
|
22（30） |
1 |
20Ω |
6000W |
1 |
|
|
30（40） |
1 |
20Ω |
6000W |
1 |
|
|
37（50） |
FST-055-T4 |
1 |
13.6Ω |
9600W |
1 |
|
45（60） |
1 |
13.6Ω |
9600W |
1 |
|
|
55（75） |
1 |
13.6Ω |
9600W |
1 |
|
|
75（100） |
2 |
13.6Ω |
9600W |
2 |
|
|
90（120） |
2 |
13.6Ω |
9600W |
2 |
|
|
110（150） |
2 |
13.6Ω |
9600W |
2 |
|
|
132（180） |
FST-160-T4 |
1 |
4Ω |
30000W |
1 |
|
160（215） |
1 |
4Ω |
30000W |
1 |
|
|
185（250） |
FST-220-T4 |
1 |
3Ω |
40000W |
1 |
|
200（270） |
1 |
3Ω |
40000W |
1 |
|
|
220（300） |
1 |
3Ω |
40000W |
1 |
|
|
250（340） |
FST-355-T4 |
1 |
2Ω |
60000W |
1 |
|
280（380） |
1 |
2Ω |
60000W |
1 |
|
|
315（430） |
1 |
2Ω |
60000W |
1 |
|
|
355（470） |
1 |
2Ω |
60000W |
1 |
|
|
400（540） |
FST-220-T4 |
2 |
3Ω |
40000W |
2 |
|
450（600） |
2 |
3Ω |
40000W |
2 |
|
|
500（680） |
2 |
3Ω |
40000W |
2 |
|
|
560（760） |
FST-355-T4 |
2 |
2Ω |
60000W |
2 |
|
630（860） |
2 |
2Ω |
60000W |
2 |
|
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