GE Mark VIe DS200DCVAG1A 

Product Parameters

Manufacturer & Series: General Electric (GE), Speedtronic Mark VIe series. Part Number: GE Mark VIe DS200DCVAG1A (the “DCVA” denotes enhanced voltage output, “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: 16 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 100 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

Enhanced Voltage Output Drive Capability: The GE Mark VIe DS200DCVAG1A 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. High-Density Analog Output Configuration: The board provides 16 analog output channels in a single VME slot. 16-Bit Resolution for Precision Control: The 16-bit DAC provides high-resolution output (effective >15 bits), enabling precise control of critical actuators. Enhanced EMC Filtering: The “A” revision features improved EMI filtering on both power supply and output lines, providing superior rejection of high-frequency noise. Extended Temperature Range: Rated for -40°C to +70°C, the GE Mark VIe DS200DCVAG1A is suitable for extreme environments including arctic installations and desert solar-thermal plants. 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 DS200DCVAG1A is pin-compatible with older Mark V analog output boards.

Application Cases

Gas Turbine – Voltage-Input Actuator Control in Desert Environment: A 9FA gas turbine in a desert environment used the GE Mark VIe DS200DCVAG1A for controlling voltage-input actuators (0-10 V) including variable frequency drives and positioners. The -40°C to +70°C rating proved essential when cabinet temperatures reached 68°C. The enhanced drive capability (20 mA into 500 Ω) allowed direct connection to multiple devices in parallel without signal degradation. Steam Turbine – VFD Control in Arctic Region: A combined-cycle plant in an arctic region implemented the GE Mark VIe DS200DCVAG1A for controlling variable frequency drives with 0-10 V inputs. The -40°C rating enabled reliable cold startup. The per-channel diagnostics detected a gradual voltage drift on one output, indicating a developing DAC issue—enabling scheduled replacement. LNG Compressor – Positioner Control in High-EMI Environment: An LNG facility installed the GE Mark VIe DS200DCVAG1A on a large centrifugal compressor for controlling voltage-input valve positioners (0-10 V). The enhanced EMC filtering rejected noise from nearby VFDs, ensuring stable positioner control. Hydroelectric Plant – Governor Control: A large hydroelectric facility used the GE Mark VIe DS200DCVAG1A for controlling governor actuators with 0-10 V inputs. The high drive capability allowed parallel connection of multiple governor inputs.

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 drive capability (10 mA) and limited temperature range. The GE Mark VIe DS200DCVAG1A provides higher drive capability (20 mA into 500 Ω), extended temperature range (-40°C to +70°C), and 16 channels. 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 DS200DCVAG1A provides 16 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 DS200DCVAG1A provides 16 channels with zero-latency VME access. vs. GE Mark V Equivalent: The GE Mark VIe DS200DCVAG1A offers substantial improvements: 20 mA drive vs. 10 mA, 500 Ω min load vs. 1 kΩ, -40°C to +70°C vs. 0°C to +55°C, 16 channels vs. 12, and enhanced diagnostics.

Selection Suggestions

Evaluate Voltage Output and Drive Requirements: If your application requires voltage outputs (0-10 V) with higher drive capability to drive multiple devices in parallel or long cable runs, the GE Mark VIe DS200DCVAG1A with 20 mA drive capability into 500 Ω is the optimal choice. For applications requiring current outputs (4-20 mA), consider the DACAG1 series. Assess Channel Count: For up to 16 analog outputs, the board is ideal. Consider 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: Ensure the external 24 VDC supply is adequately rated 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. 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.