I. Basic Information

• For VME System: VME64 backplane expansion card, designed to accommodate 2 single-width PMC modules or 1 double-width PMC module.
• For Excitation System: Simplex exciter terminal board (EXTB G2) for GE EX2100 excitation control rack. It is responsible for signal conversion of excitation circuits and control of field flashing / field suppression relays.

II. Technical Specifications

1. Parameters of VME-PMC Carrier Board

• Bus Standard: VME64 (IEEE 1014 Rev.D), PMC (IEEE P1386/draft 2.0)
• Bridge Chip: Tundra UNIVERSE II CA91C142 (33MHz), enabling high-bandwidth interconnection between VME and PCI buses
• Arbitration: 4-level VME arbitration, supports A32/D32 addressing
• PMC Slots: 2 × single-width PMC slots (or 1 × double-width PMC slot); all I/O signals are fully routed to VME P2 connector
• Dimensions: Standard VME 6U board (approx. 233×160mm)
• Power Consumption & Heat Dissipation: Low power design, compatible with cabinet forced air cooling

2. Parameters of EX2100 Excitation Terminal Board (EXTB G2)

• Control Mode: Simplex, Contactor Mode
• Power Supply: 70VDC (control power for excitation circuits)
• Relay Configuration:
  Auxiliary relays for Field Breaker 41 and Field Flashing Contactors 53A/53B
  Auxiliary contacts of Field Suppression Relay KDEP (cooperates with EDEX board to trigger SCR field suppression)
• Interface Connection: Connected to EMIO main board via EBKP backplane cable; 3 Sub-D connectors for external wiring

III. Key Features

1. VME System Expansion

• Seamless PMC Integration: Enables legacy VMEbus systems to expand modern PMC modules (communication, I/O and acquisition cards) and extends service life of existing equipment.
• Master/Slave Mode Compatibility: Configurable as VME master or slave device, supports VME64 expansion connectors.
• Complete Signal Routing: All PMC I/O signals are directly transmitted to VME P2 backplane without signal attenuation.

2. Excitation System Control (for EX2100 application)

• Simplex Excitation Control: Non-redundant architecture, cost-effective for medium & small generating units and non-critical circuits.
• Field Flashing & Field Suppression Control:
  Field Flashing: Controls contactors 53A/53B to build up initial magnetic field.
  Field Suppression: Receives trigger signals from EDEX board and drives KDEP relay to realize fast SCR field suppression.
• Fault Signal Conversion: Transmits status signals of breakers and contactors in excitation circuits to EMIO main board for system interlock and alarm processing.

IV. Working Principle

1. VME-PMC Carrier Board Mode

2. EX2100 Excitation Terminal Board Mode

V. Application Scenarios

1. Power Generation Excitation System: Applied to GE EX2100 excitation control racks; used for renovation and spare parts of simplex excitation circuits for thermal power units and hydroelectric units below 100MW.
2. Industrial VME Control System
• Power Industry: Expand communication and acquisition cards for VME racks of substation RTU and SCADA systems.
• Rail Transit: Expand I/O modules for VME bus of Train Control Units (TCU).
3. Legacy System Retrofit
• Spare part replacement for old-type simplex excitation systems of EX2100.
• Upgrade VMEbus devices and add functions such as Ethernet, Profibus and analog signal acquisition via PMC interfaces.

VI. Distinction between Similar Models

• EVMECNTM13 = EXTB G2: Simplex control, contactor mode, non-redundant design
• IS200EXTBG1A = EXTB G1: Redundant control, applied to dual hot-standby systems
• VME-PMC-CADDY: General designation for EVMECNTM13 as a VME carrier board