Description
Key Technical Specifications
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Model Number: 1C31147G01
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Manufacturer: Westinghouse (now Emerson)
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Function: Pulse accumulator module – counts pulses at 24/48 V, 12 V, or 5 V levels
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Input Levels:
– 24/48 V (CT+ and CT-) – CE mark compatible
– 12 V medium-speed (MC+ and HM-) – not CE
– 5 V medium-speed (HC+ and HM-) – not CE -
Isolation: Transformer-coupled inputs, 2 kV basic isolation typical
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Dimensions / Weight: 16 cm × 16 cm × 12 cm, 0.8 kg
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Mounting: Ovation card-file or DIN-rail (with adapter)
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Operating Temperature: –25…+85 °C typical (conformal-coated)
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Protection Degree: IP20 (module), IP67 field connector option
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Status: Factory discontinued – new & tested spares available
WESTINGHOUSE 1C31147G01
Field Application & Problem Solved
In the field the biggest headache is getting an accurate pulse count from a turbine meter or flow transmitter without running copper cables all the way back to the main rack. The 1C31147G01 solves that by living in the Ovation node: it accepts 24/48 V pulses directly from the field, transformer-isolates them, and pushes the accumulated count onto the 50 kHz carrier. You’ll typically find one per flow loop or encoder on Frame-7/9 peakers—swap time is under two minutes with the unit on turning gear. Core value: it collapses a pulse isolator, level shifter, and carrier interface into one 0.8 kg plug-in card you can hot-swap without losing counts.
In the field the biggest headache is getting an accurate pulse count from a turbine meter or flow transmitter without running copper cables all the way back to the main rack. The 1C31147G01 solves that by living in the Ovation node: it accepts 24/48 V pulses directly from the field, transformer-isolates them, and pushes the accumulated count onto the 50 kHz carrier. You’ll typically find one per flow loop or encoder on Frame-7/9 peakers—swap time is under two minutes with the unit on turning gear. Core value: it collapses a pulse isolator, level shifter, and carrier interface into one 0.8 kg plug-in card you can hot-swap without losing counts.
Installation & Maintenance Pitfalls (Expert Tips)
Input Level Must Match Field Signal – Don’t Guess
The board is factory-set for 24/48 V. If your encoder outputs 5 V TTL you’ll get no counts. Verify the dipswitch or jumper setting against the loop sheet before you insert the card—otherwise you’ll chase “zero flow” that isn’t real.
The board is factory-set for 24/48 V. If your encoder outputs 5 V TTL you’ll get no counts. Verify the dipswitch or jumper setting against the loop sheet before you insert the card—otherwise you’ll chase “zero flow” that isn’t real.
Carrier Transformer Must Be Grounded – Or the 50 kHz Dies
The 50 kHz sine rides on the module transformer. If you forget the PE bond the SNR drops 10 dB and the main rack sees “module not responding.” Torque the PE lug to 1 Nm and megger it after every lightning season.
The 50 kHz sine rides on the module transformer. If you forget the PE bond the SNR drops 10 dB and the main rack sees “module not responding.” Torque the PE lug to 1 Nm and megger it after every lightning season.
CE Mark Only Valid for 24/48 V Inputs – Don’t Use 5 V in EU
The 12 V and 5 V input options are not CE certified. If you retrofit a 5 V encoder in a CE-marked plant you’ll fail the EMC audit—use 1C31147G02 for 5 V high-speed or stick with 24/48 V.
The 12 V and 5 V input options are not CE certified. If you retrofit a 5 V encoder in a CE-marked plant you’ll fail the EMC audit—use 1C31147G02 for 5 V high-speed or stick with 24/48 V.
Spare Lead-Time Is 6-8 Weeks – Keep One on the Shelf
Factory stock is gone; new & tested spares are available but not overnight. If you crack a layer or burn the transformer you’ll be down until the part arrives—keep one in stores or you’ll discover the weakness during the next grid event.
Factory stock is gone; new & tested spares are available but not overnight. If you crack a layer or burn the transformer you’ll be down until the part arrives—keep one in stores or you’ll discover the weakness during the next grid event.
WESTINGHOUSE 1C31147G01
Technical Deep Dive & Overview
Internally the module is a transformer-coupled pulse-shaping circuit bolted to a 2 kV isolation barrier. Each input level (24/48 V, 12 V, 5 V) feeds its own winding; the carrier transformer couples the shaped pulse onto the 50 kHz Ovation back-plane. Lose the 220 VAC rail and the module stops counting; lose the transformer and the CPU throws “PULSE FLT” even if the field signal is fine. No firmware to reload—pure hardware—so you can hot-swap it: pull the old card, land the pulse leads exactly where they came from, snap the 96-pin connector in, and the DCS sees counts again in under ten seconds.
Internally the module is a transformer-coupled pulse-shaping circuit bolted to a 2 kV isolation barrier. Each input level (24/48 V, 12 V, 5 V) feeds its own winding; the carrier transformer couples the shaped pulse onto the 50 kHz Ovation back-plane. Lose the 220 VAC rail and the module stops counting; lose the transformer and the CPU throws “PULSE FLT” even if the field signal is fine. No firmware to reload—pure hardware—so you can hot-swap it: pull the old card, land the pulse leads exactly where they came from, snap the 96-pin connector in, and the DCS sees counts again in under ten seconds.
