IS200WDIIH3A | GE Mark VIe WDII Board | In Stock

Description

Product Introduction

The GE IS200WDIIH3A is a VMEbus digital input board from the Mark VIe Speedtronic series, purpose-built for high-density monitoring of discrete signals in turbine control applications. This board interfaces with field devices such as limit switches, pressure switches, temperature switches, pushbuttons, and relay contacts to provide critical status information for turbine protection, sequencing, and operator indication.

What sets the H3A revision apart is its 32-channel capacity with full optical isolation, software-configurable input filtering, and high-speed scanning capability. Each channel features a 24 VDC nominal input with wide tolerance (18–32 VDC) and programmable debounce filtering to eliminate false triggers from contact bounce. Onboard diagnostics include per-channel status monitoring and built-in self-test. For system integrators requiring high-density, reliable digital input capability for turbine control and protection systems, this board is the direct OEM solution.

Key Technical Specifications

Key Selling Points & Differentiators

• High Channel Density: 32 digital inputs on a single VME slot—reduces chassis space requirements and system cost.
• Optical Isolation: 2,500 VDC isolation protects the backplane and control system from field wiring faults.
• Configurable Input Filtering: Software-programmable debounce filtering (1–32 ms) eliminates false triggers from contact bounce without hardware modifications.
• Wide Voltage Tolerance: Accepts 18–32 VDC—compatible with industrial 24 VDC supply variations.
• High-Speed Scanning: 1 ms scan rate for all 32 channels—ideal for fast protection and interlock applications.
• Live Test Verified: Every board undergoes a 48-hour burn-in with all 32 channels exercised across the full voltage and temperature range. We log isolation integrity, scan rate, filter accuracy, and diagnostic performance.
• 90-Day Warranty: Covers functional defects. If it fails under normal operating conditions, we replace it. No restocking fee for verified returns.
• OEM Traceability: All units come from audited surplus channels with original GE anti-static bags and serialized labels. No clones, no pull-and-refurbish from unknown sources.
• Configuration Backup Service (Free): Upon request, we extract and archive your existing board’s firmware version and configuration before shipment.

Frequently Asked Questions (FAQ)

Q: What is the difference between IS200WDIIH3A and earlier WDII variants?

A: The H3A revision has improved optical isolation (2,500 VDC vs. 1,500 VDC), wider input voltage tolerance (18–32 VDC vs. 20–30 VDC), and faster scan rate (1 ms vs. 2 ms). The H3A also supports more granular input filtering options. If you need higher isolation or faster scan rates, the H3A is recommended. For basic applications, earlier variants may be sufficient.

Q: What type of digital inputs does this board support?

A: The WDIIH3A supports sourcing inputs—the field device provides the 24 VDC signal to the module. Each channel has a dedicated input terminal and a common return. The board does not support sinking inputs (where the module provides the voltage). If you have sinking field devices, you’ll need a different module or an external interface.

Q: What is the input filter and why is it important?

A: The input filter eliminates false triggers from contact bounce and electrical noise. You can configure the filter time from 1 ms (minimal filtering, fastest response) to 32 ms (maximum filtering, slowest response). For protection channels, use minimal filtering for fastest response. For operator indication or status monitoring, use longer filtering to prevent nuisance alarms. We’ve seen technicians set filters too short and get false trips; set too long and miss critical events. Match the filter to your application.

Q: What is the difference between IS200WDIIH3A and IS200WDIIH3B?

A: The H3B revision typically includes enhanced diagnostics or minor performance improvements. The H3A is the base revision. Check your existing board—if you have H3B, verify compatibility. In most cases, H3A and H3B are interchangeable, but confirm with the board’s firmware requirements.

Q: Can I use this board with 48 VDC field signals?

A: No. The WDIIH3A is designed for 24 VDC nominal (18–32 VDC range). Applying 48 VDC will damage the input circuits. If your field signals are 48 VDC, you’ll need a different module or an external voltage converter. Do not attempt to use resistors or voltage dividers—it will affect input current and may cause unreliable operation.

Q: Is this board hot-swappable?

A: No. The Mark VIe VME backplane does not support live insertion. You must de-energize the rack, ground yourself, and wait 30 seconds for bulk capacitors to discharge. We’ve seen field crews pull a WDII while the cabinet was still powered—it damaged the optical isolators on multiple channels. Don’t risk it.

Q: How do I know if a field device is faulty?

A: The WDIIH3A monitors each input channel and reports status. If a channel remains stuck ON or OFF when it should change, suspect a field device fault. The board’s self-test diagnostics can verify that the input circuits are functioning correctly. We recommend cycling the field device and monitoring the input status in the Mark VIe Toolkit. If the input status does not change, check wiring, voltage, and the field device itself.

Q: What is the scan rate and why does it matter?

A: The scan rate is the time it takes the board to read and report all 32 inputs. The H3A scans all channels in 1 ms. This is critical for protection applications where rapid response to changes is required (e.g., emergency trip signals). For slower applications (e.g., operator indication), the scan rate is less critical.

Q: What is the typical lead time for this part?

A: We stock these on the shelf—usually ship within 24 hours of order placement and payment confirmation. For international orders, add 3–5 days for customs. If you need expedited (overnight air), we can do that, but you’ll need to coordinate with our logistics team for the cut-off time.

Q: Does this board work with the newer Mark VIeS (SIL-rated) cabinets?

A: To be direct: no. The IS200WDIIH3A is not SIL-certified. It’s meant for standard Mark VIe industrial control. The SIL-rated systems use the IS220WDII (with additional redundancy, diagnostic coverage, and separate safety shutdown path). Mixing them violates your site’s safety integrity level. If you’re in a SIL environment, we can source the correct variant but it will have a different model number.

Q: What’s your return policy if this doesn’t solve my digital input issue?

A: If the board is electrically functional (passes our QC test) but doesn’t correct your fault, we’ll accept a return within 30 days provided the board shows no physical damage and the connectors are intact. We do charge a 15% restocking fee if the fault was due to field wiring issues, configuration errors, or toolkit compatibility problems. We’ll work with you over the phone or email to diagnose the problem before we ship—our goal is to get you running, not to ship boxes back and forth.

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