Description
ABB 3BHE024747R0101 GDC801A Crowbar Board
3BHE024747R0101 GDC801A Crowbar Board
Product Name: ABB GDC801A 3BHE024747R0101 Crowbar Board (Crowbar Protection Board/DC Bus Overvoltage Protection Board)
Brand: ABB
Series: ABB medium voltage drive and excitation system matching protection control board, compatible with ACS6000 series high voltage frequency converter and UNITOL 5000/6000 static excitation system
Product type: DC bus Crowbar overvoltage protection control board
Core function: As the last overvoltage protection barrier for the DC bus of medium and high voltage frequency converters or excitation systems. When the DC bus voltage exceeds the safety threshold due to sudden load changes, regenerative energy feedback, or power device failures, GDC801A quickly detects the overvoltage signal and triggers the Crowbar thyristor action within microseconds, forcing the DC bus to short circuit to ground and quickly consuming excess energy through high current discharge, thereby protecting IGCT/IGBT power modules, electrolytic capacitors, and other key devices from overvoltage breakdown damage. After troubleshooting, the system can automatically or manually restore normal operation.
ABB 3BHE024747R0101 GDC801A Crowbar Board
Working Principle:
Real time monitoring of DC bus voltage (through onboard voltage sampling circuit)
When the voltage exceeds the preset threshold (usually 110% -120% of the rated voltage), a thyristor trigger pulse is immediately generated
Drive the Crowbar thyristor to conduct, short-circuit the positive and negative terminals of the DC bus, and consume energy through current limiting resistors/reactance
Simultaneously sending fault alarm signals to the main control system through relay output, triggering system level protection actions (such as blocking power devices, disconnecting input circuit breakers, etc.)
Key electrical parameters:
Power supply voltage: 24V DC
Power consumption: less than 5W
Input channel: 8-channel digital input (used to receive voltage sampling signals, temperature signals, system status signals, etc.)
Output channel: 16 relay outputs (used to drive Crowbar thyristor trigger circuits, fault interlocks, alarm indications, etc.)
Output type: Relay output
Maximum load current: 2A (per circuit)
Communication interface: RS-485
Communication baud rate: 9600bps/19200bps/38400bps/57600bps/115200bps (optional)
Communication distance: up to 1200 meters
Physical parameters:
Size: 230mm x 160mm x 50mm (width x height x depth)
Weight: Approximately 1.5kg
Installation method: DIN rail installation or panel fixed installation
Protection level: IP20 (module level)
Environmental parameters:
Working temperature: -40 ° C to+85 ° C
Storage temperature: -40 ° C to+125 ° C
Protection function:
Reverse power protection
Overvoltage protection (core function)
overcurrent protection
Onboard indicator lights: power indicator light, communication indicator light, output status indicator light
Wiring terminals:
8-way digital input terminal
16 channel digital output terminal
1 RS-485 communication terminal
Typical application scenarios:
ABB ACS6000 series high-voltage frequency converter: DC bus overvoltage protection for high-power motor drives such as boiler fans, water pumps, mine crushers, and steel rolling main drives in power plants
ABB UNITOL 5000/6000 Static Excitation System: DC Side Overvoltage Protection for Synchronous Generator Excitation Circuit
High Voltage Direct Current Transmission (HVDC) Converter Station
Large UPS system DC bus protection
DC side protection of wind power full power converter
Related models in the same series:
GDC801B101 (3BHE051592R0101): A digital I/O module of the same series, with 8 inputs/8 outputs, used to achieve complete I/O expansion in conjunction with the Crowbar board
3BHE03905R0101 LT C745 A101: ABB voltage driven Crowbar circuit board, belonging to the Crowbar protection series
GVC750BE101 (3BHE009681R0101): IGCT gate drive circuit, used in conjunction with Crowbar board, requires complete replacement in case of malfunction
3BHB045647R0003: ABB excitation thyristor module, one of the objects protected by Crowbar board
