IS200VAICH1DAB | GE Mark VIe Vibration Analog Input Card
IS200VAICH1DAB | GE Mark VIe Vibration Analog Input Card - Image 2
IS200VAICH1DAB | GE Mark VIe Vibration Analog Input Card - Image 3
IS200VAICH1DAB | GE Mark VIe Vibration Analog Input Card - Image 4

IS200VAICH1DAB | GE Mark VIe Vibration Analog Input Card

  • Model: IS200VAICH1DAB
  • Brand: GE (General Electric)
  • Series: Mark VIe Turbine Control System
  • Core Function: Processes proximity probe signals for shaft vibration monitoring
  • Type: Vibration Analog Input Card (VAIC)
  • Key Specs: 8 channels, -24V DC bias supply, 0–1000 Hz bandwidth
  • Note: Critical safety component; verify calibration data and firmware revision before installation in active protection loops.
Category: SKU: IS200VAICH1DAB GE

Description

Key Technical Specifications

Parameter Specification
Input Type Proximity Probe (Eddy Current)
Channels 8 independent inputs
Bias Supply -24V DC (regulated per channel)
Signal Range -2V to -18V DC typical operating range
Bandwidth 0.5 Hz to 1000 Hz (-3dB)
Accuracy ±1% of full scale (dependent on probe linearity)
Mounting Type Mark VIe Backplane Slot
Operating Temp -30°C to +65°C
Indicator LEDs Channel OK, Fault, A/D Converter Status
Connector Type 37-pin D-Sub or Terminal Block (Verify physical unit)
Isolation Channel-to-channel and channel-to-ground
Compliance API 670 compliant signal conditioning

Product Introduction

The IS200VAICH1DAB serves as the dedicated signal conditioning interface for shaft vibration sensors within the GE Mark VIe control system, converting raw eddy current probe data into precise digital values for the main processor. It provides the essential -24V DC bias required by Bently Nevada-style proximitor probes.This card differentiates itself through high-speed analog-to-digital conversion tailored for transient event capture during turbine startup and coast-down. Field experience shows that proper grounding of the shield drains on this card reduces noise floor interference by up to 40% compared to generic analog cards. (Always inspect the D-sub connector pins; bent pins are the most common cause of “intermittent” vibration alarms).

Installation & Configuration Guide

Preparation (10 min)

  • Ensure the turbine is in a safe state (stopped or maintenance mode).
  • Verify the IS200VAICH1DAB hardware revision matches the system configuration file (.cfg).
  • Gather tools: #1 and #2 Phillips screwdrivers, multimeter, ESD wrist strap, magnifying glass.

Removal (5–10 min)

  • Disconnect the vibration sensor cable harness from the front connector.
  • Remove the two mounting screws securing the card to the rack.
  • Gently pull the module straight out. Do not wiggle excessively; the backplane pins are fragile.
  • Real-world detail: If the connector feels stiff, check for locked retaining screws on the D-sub hood before forcing it.

Installation (10 min)

  • Align the IS200VAICH1DAB with the designated backplane slot (usually slots 1-4 in VIB racks).
  • Push firmly until the backplane connector seats. Listen for the click.
  • Secure mounting screws. Torque to 1.2 Nm.
  • Reconnect the sensor harness. Ensure the shield drain wire is connected to the chassis ground point, not the signal ground.

Power-On & Test (10 min)

  • Apply control power to the rack.
  • Observe the “Card OK” LED. It should be solid green.
  • Measure the bias voltage at a spare channel or via the test points: should be -24V DC ±1V.
  • Simulate a vibration signal (if equipment available) or verify zero-gap voltage reads approximately -10V DC for a properly gap-set probe.

Troubleshooting Quick Reference

Symptom Probability Action
Red Fault LED High Check -24V DC bias supply. A shorted probe cable often trips channel protection.
Erratic readings High Inspect shield grounding. Look for loose connections at the proximitors.
All channels zero Medium Verify backplane communication with the main processor (VCMI/TCCB).
High noise floor Medium Separate sensor cables from VFD power cables. Check for ground loops.
Card not recognized Low Reseat the card. Clean backplane pins with contact cleaner.
IS200VAICH1DAB GE

IS200VAICH1DAB GE

Dimensions, Mounting & Wiring Notes

  • Dimensions: Approx. 160mm (H) x 120mm (W) x 40mm (D) — Verify with physical caliper measurement.
  • Mounting: Standard Mark VIe backplane slot.
  • Terminal Notes: Use shielded twisted pair cable (22–18 AWG) for all sensor inputs.
  • Clearance: Maintain 50mm clearance in front for cable bending radius.
  • Warning: Never hot-swap this card while the turbine is running; it will trigger a false trip if the system is configured for redundant voting.

FAQ

Q: Can I use this card for temperature inputs?
A: No. The IS200VAICH1DAB is specifically calibrated for eddy current vibration probes. Using it for RTDs or thermocouples will yield incorrect data and may damage the card.Q: My old card was IS200VAICH1CAB. Is the “DAB” version compatible?
A: Generally yes, but the “D” revision often includes updated filtering components. You must update the system configuration file to match the new hardware revision before operation.Q: Why is my bias voltage reading -18V instead of -24V?
A: This usually indicates a short circuit in the field wiring or a failed probe. Disconnect the field cable; if the voltage returns to -24V, the fault is in the cabling or sensor.Q: How often should these cards be calibrated?
A: The card itself doesn’t drift significantly. However, the entire loop (probe + cable + card) should be verified during every major turbine outage (typically every 2–4 years).Q: Does this come with a test report?
A: Yes. All refurbished units undergo a live functional test including bias voltage verification and signal simulation. We document the results in the shipped package.Q: What happens if I plug this into the wrong slot?
A: The Mark VIe system checks slot IDs at boot. If the configuration doesn’t match the physical layout, the controller will fault and likely prevent the turbine from starting.

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