The DS200LDCCH1A is a Drive Control/LAN Communications Board designed by General Electric (GE) Motors & Industrial Systems for its DIRECT-O-MATIC 2000 series drives and exciters. Belonging to the LDCC (Drive Control/LAN Communications Board) series, this board is revision H1 and serves as the core control component for GE 2000 series drive systems, integrating drive control, motor control, and local area network communication functions.
The primary function of the LDCC drive control board is to provide primary control for drives and motors, I/O processing, and local area network communication control. The board employs a multi-processor architecture, featuring four microprocessors that handle drive control, motor control, co-processing, and LAN communication tasks, meeting the needs of various applications from small and medium drives to large multi-bridge drive systems. The onboard operator interface (Programmer) supports software adjustments and diagnostic testing, enabling parameter configuration and troubleshooting without additional tools.
The DS200LDCCH1A board embodies GE’s advanced technology in drive control and features the following characteristics:
Multi-Processor Architecture: Integrates four independent microprocessors handling control, application, I/O, and communication functions respectively.
Onboard Operator Interface: 16-character digital display and optional Programmer module support on-site parameter adjustment and diagnostics.
Multiple Reset Options: Supports hardware reset, software reset, external signal reset, and watchdog protection.
Flexible LAN Communication: Supports various bus systems including DLAN+, DLAN, Genius Bus, CPL serial link, and C-bus.
Reprogrammable Firmware: Flash PROMs support field upgrades, and EEPROM supports parameter downloads.
Rich I/O Interfaces: Provides multiple analog, digital, frequency, and communication interfaces.
This product is widely used in DC drive systems, AC variable frequency systems, excitation systems, and various industrial process control applications, particularly in industrial drive applications requiring high-performance control and network communication.
II. Key Functions
1. Drive and Motor Control
The DS200LDCCH1A board contains four microprocessors that handle control, application, and I/O functions:
| Processor | Location | Function Description |
| Drive Control Processor (DCP) | U1 | Features built-in I/O peripherals including address decoding, interrupt controllers, timer/counters, and DMA controller; handles user interfaces, regulation loops (such as speed and position), and system-level functions |
| Motor Control Processor (MCP) | U21 | Controls high-speed and conventional digital I/O, analog I/O, timer/counters, and watchdog timer; handles inner loops (such as current regulation) and motor-specific functions (such as DC phase control, AC motion control) |
| Co-motor Processor (CMP) | U35 | Performs math-intensive functions to support motor control algorithms beyond MCP capability; used only in drives requiring additional processing power |
| LAN Control Processor (LCP) | U18 | Controls local area network communications, processing I/O from up to five different bus systems |
2. Communications Control
The DS200LDCCH1A board controls LAN communications through the LCP processor, supporting the following bus systems:
DLAN+: GE’s ARCNET-based drive LAN protocol
DLAN: GE’s drive LAN used for smaller drives and earlier large drives
Genius Bus: Connected via an interface board such as DS200ADGI
CPL (Control Party Line): Serial link via an interface board such as DS200ADCI
C-bus: Parallel differential bus via an interface board such as DS200ADCI
3. Onboard Software
The DS200LDCCH1A board stores software in various memory devices:
Flash PROMs (U6, U7, U11, U12, U22, U23): Store configuration data and can be reprogrammed in the field.
EEPROM (U9): Stores field-adjustable parameters, downloaded using drive configuration tools.
4. Operator Interface
The DS200LDCCH1A board provides two operator interface methods:
Onboard 16-Character Digital Display: Displays fault codes and operating status.
Programmer Module (Optional): Connects via the KPPL connector, featuring an alphanumeric keypad and display window for software adjustments and diagnostic testing.
5. Reset Options
The DS200LDCCH1A board provides four reset methods:
Hardware Reset: Via the onboard RESET pushbutton.
External Signal Reset: Via applying +5 to +24 V dc to pin 30 of the 6PL connector.
Software Reset: Via software or the Programmer module’s reset key.
Watchdog Protection: Automatic reset by internal hardware watchdog.
III. Hardware Architecture
1. Board Structure
The DS200LDCCH1A board uses a standard printed circuit board structure and includes:
Four Microprocessors: DCP (U1), MCP (U21), CMP (U35), LCP (U18)
Flash PROMs: 6 devices (U6, U7, U11, U12, U22, U23)
EEPROM: 1 device (U9)
Onboard Testpoints: Multiple metal posts for troubleshooting
LED Indicators: DN1 bar graph LEDs for fault code display
Hardware Jumpers: Berg-type jumpers and hard-wired jumpers
Multiple Connectors: 10 onboard cable connectors
2. Indicator Lights
The DN1 bar graph LEDs are used to display drive fault codes:
| Fault Code Range | Display Mode |
| 1-399 | Slow blink rate BCD pattern (leftmost 2 LEDs encode the 100s digit, next 4 LEDs encode the 10s digit, rightmost LED encodes the units digit) |
| 400-1023 | Faster blink rate binary pattern (leftmost LED is 2^8=512, decreasing sequentially) |
| No fault or drive not running | Sequential blinking, two at a time, from outer positions inward to center and back |
These LEDs can also be set by software jumper to display drive variables during operation (such as absolute or signed bar graph mode), but this setting does not inhibit the LED fault display.
3. Testpoints
| Testpoint | Name | Definition |
| TP8 | FCLK | 8 MHz oscillator output; in DC2000, analog representation of armature current (+2 V offset, 0.5 V = 1 pu); in AC2000, analog representation of phase A motor current (+2.5 V offset) |
| TP3 | P15 | Regulated +15 V power supply (±5%) |
| TP4 | N15 | Regulated -15 V power supply (±5%) |
| TP6 | DCOM | 0 V common reference point |
| TP2 | Frequency | Input line frequency |
| TP5 | P5 | Regulated +5 V power supply (±5%) |
| TP7 | VTP | In DC2000, motor armature voltage (3.4 V = 1 pu) |
4. Hardware Jumpers
| Jumper | Function | Position 1-2 | Position 2-3 |
| JP1 | EEPROM write protect | Write enable (required to modify EEPROM) | Write disable |
| JP14-16 | DLAN driver selection | Isolated DLAN circuit | RS-422 drivers/receivers |
| JP17-18 | DLAN termination resistors | Termination resistors in | Termination resistors out |
| JP19 | Processor crystal connection | Normal running condition | Manufacturing testing |
| JP22 | MCP 16 MHz clock enable | Enabled (required for normal operation) | Manufacturing test only |
| JP7 | Feedback VCO gain | Normal gain | Increase gain 6:1 |
| JP8 | Feedback VCO absolute value circuit | Absolute mode (for analog AC tachometers) | Normal mode |
| WJ1-WJ4 | Hard-wired jumpers | Feature reserved for future applications | — |
IV. Detailed Interface Description
1. Connector 1PL (to Bridge Interface Board)
The 1PL connector connects to the Bridge Interface Board, primarily transmitting analog inputs, frequency inputs, high-speed outputs, discrete outputs, and other signals.
2. Connector 2PL (to Signal-Level Power Supply Board)
The 2PL connector connects to the Signal-Level Power Supply Board, providing ±5 V, ±15 V, ±24 V power and the /PSEN signal.
3. Connector 3PL (to EX2000 Micro-Application Board)
The 3PL connector is used for EX2000 exciter applications, transmitting buffered data bus lines, address lines, control signals, etc. Used only in EX2000 exciter applications.
4. Connector 6PL (to Terminal Board)
The 6PL connector is the primary interface between the LDCC and the external terminal board, including:
Control Lines: CTLN1/CTLN2 (MA contactor control circuit)
Digital Inputs: RUN (run), JOG (jog), POL (polarity), XSTP (auxiliary stop)
Analog Inputs: P1B-P4B, ASPO, VC3NB/VC3PB, VC4NB/VC4PB
Analog Outputs: DA1/DA2 (12-bit D/A), MET1-MET3 (8-bit D/A)
Communication Interface: TDB/RDB/RTSB (RS-232C)
Reset Input: RESET (+5 to +24 V dc)
5. Connector 7PL (to Signal Interface Board)
The 7PL connector connects to the Signal Interface Board, transmitting:
Encoder Signals: E1UP/E1DN, E2UP/E2DN, E1Z/E2Z
SPC Analog Channels: SPA1, SPA2
Synchronization Signals: SPSYN (input/output)
Serial Communication: SPTX, SPRX
6. Connector 8PL (to Drive Terminal Board)
The 8PL connector connects to the Drive Terminal Board, including:
RS-422 Communication: FA, FB
Encoder Interface: EOAB/OE0AB, EOBB/OE0BB, EOMB/OE0MB
General Purpose Control Inputs: CI1-CI8 (±24 V dc, 27 kΩ input impedance, 2 ms hardware filter)
7. Connector 11PL (to Meter Driver Module)
The 11PL connector connects to the Meter Driver Module, providing four meter outputs (MTR1-MTR4).
8. Connector ARCPL (to ARCNET/DLAN Interface Board)
The ARCPL connector connects to the ARCNET/DLAN Interface Board, transmitting DLAN communication signals (TXAN/TXAP, TXBN/TXBP, TXA/TXB).
9. Connector IOPL (to LAN Terminal Board)
The IOPL connector connects to the LAN Terminal Board, transmitting I/O data lines (input data lines 1-8, output data lines 1-7).
10. Connector KPPL (to Programmer Module)
The KPPL connector connects to the optional Programmer module, providing keyboard scanning and display drive signals.
11. Connector LNPL (to Genius/CPL Bus Interface Board)
The LNPL connector connects to the Genius/CPL Bus Interface Board, transmitting buffered data lines, address lines, control signals, etc.
V. Installation and Maintenance
1. Mounting Location
The DS200LDCCH1A board is installed in the board carrier of the drive control cabinet, facing the front. The Signal Processor Board and Programmer module can be mounted directly onto the LDCC board.
2. Replacement Procedure
Power Off: Turn off power to the drive, wait several minutes for power supply capacitors to discharge, and test to verify that no power exists.
Open Cabinet Door: Access the printed wiring board area.
Disconnect Cables: Carefully disconnect all cables (including cables to any boards mounted on the LDCC).
Release Snaps: Push back the plastic snaps to remove the LDCC board.
Remove Accessories: If a Signal Processor Board or Programmer module is installed, remove them.
Configure New Board: Set all configurable components on the new board to the same positions as on the board being replaced.
Install New Board: Install the new LDCC board, ensuring all snaps snap into position.
Install Accessories: Reinstall the Signal Processor Board and Programmer module.
Reconnect Cables: Reconnect all cables as labeled, ensuring they are properly seated at both ends.
3. Replacing EEPROM U9
EEPROM U9 contains the drive’s field-adjustable software parameters. Software can be transferred from an old board to a new board by moving the chip:
Carefully remove the EEPROM chip from the old board.
Insert it into the correct socket on the new board, ensuring proper orientation.
If the same failure symptoms persist, install the new EEPROM shipped with the new board and download the drive configuration using software tools.
4. Maintenance Recommendations
ESD Precautions: Always wear a grounding strap when handling boards. Store boards in anti-static bags.
Periodic Inspection: Check connectors for looseness and plastic snaps for secure fastening.
Spare Parts Management: It is recommended to keep at least one identical LDCC board on-site as a spare to minimize downtime.
VI. Applications
The DS200LDCCH1A Drive Control/LAN Communications Board is widely used in the following industrial applications:
DC2000 DC Drive Systems: Provides complete control functions for DC motor drives.
AC2000 AC Variable Frequency Systems: Provides control functions for AC motor drives.
CB2000 Digital Control Systems: Serves as the core processing unit for control systems.
EX2000 Excitation Systems: Used for generator excitation control.
FC2000 Frequency Control Systems: Provides control functions in variable frequency drive systems.
GF2000 Generator Control Systems: Used for generator control and protection.
ME2000 Motor Control Systems: Provides core control functions in motor control applications.
Multi-Bridge Drive Systems: Supports large multi-bridge drive applications.
