ABB 3BHB003688R0001
The ABB 3BHB003688R0001 is a LD-T (Local Drive Interface) Board or LDTC Board (Local Drive Thyristor Control). It is a critical component from the ACS 1000 series of industrial AC drives.
Its primary function is to act as the interface and control unit between the drive's main computer (NDCU/ADSU) and the high-power thyristor (SCR) stacks in the inverter section. It handles gate pulse generation, monitoring, and protection for the inverter's power semiconductors.
Detailed Technical Parameters
| Parameter Category |
Specification |
| Manufacturer |
ABB |
| Product Type |
Printed Circuit Board (PCB) / Electronic Module |
| Product Family |
ACS 1000 (Industrial AC Drive) |
| Designation |
LD-T Board (Local Drive Interface for Thyristor control) or LDTC Board |
| Main Function |
Interface and control board for the inverter thyristor (GTO/IGCT) gate units. Generates and amplifies the gate pulses. |
| Compatible Drives |
ACS 1000 (e.g., models like ACS 1000-07...). Note: It is absolutely crucial to verify compatibility with your specific drive type and serial number, as revisions exist. |
| Key Components on Board |
• Pulse transformers for gate drive isolation
• Optical receivers/transmitters for communication with the NDCU
• Monitoring circuits for voltage and current
• LEDs for status indication (e.g., Ready, Fault) |
| Input Signals |
• Fiber-optic commands from the NDCU (North DCS Control Unit) for firing pulses.
• Power supply voltages (typically +24V DC).
• Feedback signals from the thyristor units (e.g., voltage measurements, di/dt monitoring). |
| Output Signals |
• High-current, isolated gate pulses to the individual thyristors (GTO/IGCT) in the inverter stack.
• Status and fault signals sent back to the NDCU via fiber optics. |
| Communication Interface |
Primarily fiber-optic links for noise immunity and isolation from high-power circuits. |
| Monitoring & Protection |
• di/dt monitoring: Protects thyristors from excessive current rise rates.
• Gate unit monitoring: Checks the health of the gate drive circuits.
• DC-link voltage measurement. |
| Status Indicators (LEDs) |
Typically includes LEDs for:
• POWER: Indicates board has power.
• READY: Indicates board is operational and ready.
• FAULT: Illuminates when an internal or thyristor fault is detected. |
| Form Factor |
Standard Eurocard format PCB designed to slot into a rack or unit within the ACS 1000 inverter cubicle. |
Function in the System
The 3BHB003688R0001 LD-T board is a vital part of the drive's inverter section. Here's how it works:
Receives Commands: It receives low-power, isolated firing commands via fiber-optic cables from the main controller (NDCU).
Amplifies Pulses: It amplifies these logic-level signals into high-power, high-current pulses required to reliably switch the large thyristors (GTOs or IGCTs) on and off.
Provides Isolation: It provides essential galvanic isolation (through pulse transformers) between the sensitive control electronics and the high-voltage power circuit.
Monitors Health: It continuously monitors the health of the thyristors and its own gate drive circuits. If it detects a problem (e.g., a short circuit, a faulty gate connection, an overcurrent), it will instantly send a fault signal back to the NDCU, which will trip the drive to prevent catastrophic failure.
Provides Status: Its LED indicators give technicians a first point of reference for diagnosing faults within the inverter section.
Common Applications
This board is used exclusively in the ACS 1000 series of medium-voltage, variable frequency drives. These drives are used to control the speed and torque of large AC motors in demanding industrial applications, such as:
Pumps and Fans (for significant energy savings)
Compressors
Conveyors
Mills and Crushers
Extruders
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