IS220PAICH1A
IS220PAICH1A
IS220PAICH1A
IS220PAICH1A
IS220PAICH1A

GE IS220PTURH1BF | Primary Trip I/O Pack for Mark VIe – Field Service Notes

  • Model: IS220PTURH1BF
  • Alt. P/N: IS220PTURH1B (base model)
  • Product Series: GE Speedtronic Mark VIe / VIeS
  • Hardware Type: Turbine-Specific Primary Trip I/O Pack (PTUR)
  • Key Feature: 4 isolated magnetic speed inputs with on-board trip logic
  • Primary Field Use: Executes turbine overspeed, zero-speed, and emergency shutdown (ESD) functions
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Part number: IS220PTURH1BF
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Description

Hard-Numbers: Technical Specifications

  • Protocol Support: Redundant IONet 100Mbps Ethernet
  • Port Count: 2× RJ45, 1× DC-62 field connector
  • Speed Inputs: 4× passive magnetic pickup (MPU) channels
  • Isolation Rating: 2500 VAC RMS field-to-backplane
  • Processor: Dedicated on-board CPU, 16MB SDRAM, 32MB Flash
  • Power Requirements: 24 VDC, 8.5W max draw
  • Operating Temperature: -30°C to +65°C
  • Common-Mode Rejection: 120 dB @ 50/60 Hz
  • Hazardous Rating: Class I Div 2, Zone 2, ATEX/IECEx
  • Weight: 0.60 kg
  • Dimensions: 158.75 × 107.95 × 30 mm
  • Firmware: Auto-download & reconfigurable from controller
IS220PAICH1A

IS220PAICH1A

The Real-World Problem It Solves

Standard analog input modules lack independent safety logic for turbine trips. Relying on the main controller creates a single point of failure for overspeed protection. offloads critical trip functions to dedicated hardware, ensuring failsafe operation independent of the main control processor.

Where you’ll typically find it:

  • Gas turbine primary overspeed protection systems
  • Steam turbine emergency shutdown (ESD) logic
  • Compressor train critical speed monitoring

Bottom line: provides hardware-enforced safety separation to meet API 670 and IEC 61508 requirements.

 

Hardware Architecture & Under-the-Hood Logic

operates as a standalone safety module with isolated signal paths and its own processor. Trip execution does not depend on the main Mark VIe controller.

  1. Magnetic pickup signals enter 4 galvanically isolated input channels.
  2. On-board CPU independently calculates rotor speed, acceleration, and gap voltage.
  3. Internal trip logic compares real-time values to preconfigured setpoints.
  4. Dedicated relay outputs initiate turbine shutdown when thresholds are breached.
  5. Dual Ethernet ports communicate status and diagnostics to the main controller.
  6. Built-in self-tests monitor channel health and internal integrity.
  7. Firmware and trip settings auto-load from the controller on power-up.
IS220PAICH1A

IS220PAICH1A

Field Service Pitfalls: What Rookies Get Wrong

Reversed MPU PolaritySwapping coil wires causes erratic speed pulses or zero-speed faults, leading to failed trip tests.

  • Field Rule: Verify phase with a calibrator before energizing; mark correct polarity at the terminal block.

Poor Shielding PracticesUnshielded cables pick up VFD/exciter noise, corrupting low-level speed signals and causing false trips.

  • Quick Fix: Use twisted-pair, foil-shielded cable; ground shield only at the TTUR terminal board.

Loose DC-62 TerminationsUnder-torqued connectors create intermittent signal loss, triggering nuisance trips during vibration.

  • Field Rule: Torque all field terminal screws to 0.5 N·m (4.4 lb·in); re-torque after 24 hours.

 

Commercial Availability & Pricing Note

Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.

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