GE Mark VIe DS200DCVAG2A 

Product Parameters

Manufacturer & Series: General Electric (GE), Speedtronic Mark VIe series. Part Number: GE Mark VIe DS200DCVAG2A (the “DCVA” denotes enhanced voltage output, “G2” denotes 24-channel variant, “A” enhanced revision). Power Supply: +5 VDC (logic) and +24 VDC (field power) drawn from the Mark VIe VME64x backplane and external field power supply. Channel Configuration: 24 analog output channels. Output Range: 0-10 VDC (fixed voltage output, software-selectable scaling options). Resolution: 16-bit DAC (effective resolution: >15 bits). Accuracy: ±0.05% of full scale (at 25°C); ±0.10% across full temperature range (-40°C to +70°C). Output Current: Up to 20 mA per channel (continuous) with enhanced drive capability. Output Load: 500 Ω minimum load (higher drive capability for parallel devices). Output Protection: Short-circuit protection (current limited with auto-recovery), over-temperature protection, and reverse polarity protection on field power. Output Ripple: <2 mV peak-to-peak. Output Update Rate: Up to 80 Hz per channel (software-selectable). Diagnostics: Output channel voltage/current monitoring (12-bit resolution), open-load detection with programmable thresholds, short-circuit detection with auto-recovery, over-temperature detection, field power supply monitoring (voltage and current), internal reference monitoring, and channel health status reporting with detailed fault codes. Operating Temperature: -40°C to +70°C (extended vs. standard -30°C to +65°C). Mounting & Connectivity: Direct VME backplane insertion; front panel features a 68-pin high-density SCSI-style connector with enhanced grounding for EMI shielding.

Advantages & Features

High-Density Voltage Output Configuration: The GE Mark VIe DS200DCVAG2A provides 24 analog output channels in a single VME slot—50% more than the G1 series (16 channels). This makes it ideal for large turbine applications requiring extensive voltage-output actuator control such as multiple VFDs, positioners, and actuators. Enhanced Voltage Output Drive Capability: The board provides 0-10 VDC outputs with up to 20 mA drive capability into 500 Ω minimum load, enabling direct drive of multiple voltage-input actuators in parallel or long cable runs without signal degradation. Extended Temperature Range: Rated for -40°C to +70°C, the GE Mark VIe DS200DCVAG2A is suitable for extreme environments including arctic installations and desert solar-thermal plants. Enhanced EMC Filtering: The “A” revision features improved EMI filtering on both power supply and output lines, providing superior rejection of high-frequency noise. 16-Bit Resolution for Precision Control: The 16-bit DAC provides high-resolution output (effective >15 bits), enabling precise control of critical actuators. Per-Channel Diagnostics: Each output channel includes voltage/current monitoring, open-load detection with programmable thresholds, short-circuit detection with auto-recovery, and over-temperature protection. Short-Circuit Protection with Auto-Recovery: Output channels include current-limited short-circuit protection with auto-recovery. Per-Channel Optical Isolation: Each output channel provides 2500 Vrms optical isolation. Flexible Output Scaling: Each channel can be software-scaled for different voltage ranges (0-5 V, 0-10 V, etc.) to accommodate different actuator requirements. Backward Compatibility: The GE Mark VIe DS200DCVAG2A is pin-compatible with older Mark V analog output boards.

Application Cases

Gas Turbine – Extensive VFD and Actuator Control in Desert Environment: A large 9HA gas turbine installation used the GE Mark VIe DS200DCVAG2A for controlling 24 voltage-input actuators including VFDs, positioners, and servo drives. The high channel density allowed all analog outputs to fit in a single board, saving VME slots and simplifying cabinet design. The enhanced drive capability (20 mA into 500 Ω) allowed direct connection to multiple devices in parallel. The -40°C to +70°C rating proved essential when cabinet temperatures reached 68°C. Steam Turbine – Multiple VFD Control in Arctic Region: A combined-cycle plant in an arctic region implemented the GE Mark VIe DS200DCVAG2A for controlling 24 variable frequency drives with 0-10 V inputs. The -40°C rating enabled reliable cold startup. The high density allowed comprehensive VFD control with minimal board count. LNG Compressor – Positioner and Actuator Control: An LNG facility installed the GE Mark VIe DS200DCVAG2A on a large centrifugal compressor for controlling 24 voltage-input valve positioners and actuators. The enhanced EMC filtering rejected noise from nearby VFDs, ensuring stable positioner control. Hydroelectric Plant – Governor and Auxiliary Control: A large hydroelectric facility used the GE Mark VIe DS200DCVAG2A for controlling 24 governor actuators and auxiliary systems with 0-10 V inputs. The high channel density allowed a single board to handle all control outputs.

Comparison with Competitors

vs. Siemens Simatic ET 200SP HA Analog Output Module with Extended Temperature: Siemens offers analog output modules with voltage outputs but typically with lower density (8-16 channels), lower drive capability (10 mA), and limited temperature range (-25°C to +60°C). The GE Mark VIe DS200DCVAG2A provides 24 channels, higher drive capability (20 mA into 500 Ω), extended temperature range (-40°C to +70°C), and enhanced diagnostics. vs. ABB S800 Analog Output Module with Voltage Output: ABB offers voltage output modules with 8 channels but lower density and drive capability. The GE Mark VIe DS200DCVAG2A provides 24 channels and enhanced drive capability. vs. Rockwell Automation ControlLogix 1756-OF8 Analog Output Module: Rockwell offers 8-channel modules requiring an EtherNet/IP adapter. The GE Mark VIe DS200DCVAG2A provides 24 channels with zero-latency VME access. vs. GE Mark V Equivalent: The GE Mark VIe DS200DCVAG2A offers substantial improvements: 24 channels vs. 16, 20 mA drive vs. 10 mA, 500 Ω min load vs. 1 kΩ, -40°C to +70°C vs. 0°C to +55°C, and enhanced diagnostics.

Selection Suggestions

Evaluate Channel Count and Voltage Output Requirements: If your application requires more than 16 voltage outputs (e.g., large turbines with multiple VFDs, positioners, and actuators), the GE Mark VIe DS200DCVAG2A with 24 channels and enhanced drive capability is the optimal choice. For applications requiring current outputs (4-20 mA), consider the DACAG series. Assess Environmental Conditions: For extreme temperatures, the “A” revision is recommended. Check System Compatibility: The board requires ToolboxST software v5.5 or later. Spare Parts Strategy: Typical lead times are 4-8 weeks; maintain at least one spare board per system for critical applications.

Precautions

ESD Protection: Always use ESD precautions during handling. No Hot-Swapping: Always de-energize the rack before insertion or removal. Field Power Supply: With 24 outputs, ensure the external 24 VDC supply is adequately rated (minimum 2.5 A for all channels at 20 mA) and isolated from backplane power. Output Load Limits: Ensure the load is at least 500 Ω—lower loads will exceed the output current capability and may cause distortion or damage. Do not exceed 20 mA per channel. Heat Dissipation: With 24 channels, ensure adequate cabinet ventilation to dissipate heat from the output drivers. Wiring Complexity: With 24 outputs per board, careful wiring planning is essential. Use properly labeled cables and ensure termination panels are clearly marked. Cable Capacitance: For long cable runs, consider cable capacitance effects on output stability. Use shielded twisted-pair cables with appropriate capacitance ratings. Parallel Connections: When driving multiple devices in parallel, ensure the total load impedance is ≥500 Ω to stay within the 20 mA output capability. Open-Load Threshold Configuration: Configure open-load detection thresholds appropriately—too low may cause nuisance alarms; too high may miss actual open-load conditions. Wiring: Use shielded twisted-pair cables for analog outputs to minimize noise pickup. Configuration Backup: Export configuration via ToolboxST before replacement. Storage Conditions: Store in original anti-static bags within 10°C to 35°C and humidity below 50%. Firmware Compatibility: The “A” variant requires specific firmware (typically v5.5 or later). Temperature Cycling: Avoid rapid temperature changes (>5°C per minute). Periodic Inspection: In harsh environments, periodically inspect for connector corrosion or contamination. Calibration: GE recommends external calibration every 24 months. For critical applications, consider annual calibration using a traceable signal source. Regulatory Compliance: Maintain documentation of calibration records and diagnostic data.