Part Code Definition

1C31xxx: Ovation standard I/O module series prefix

189: exclusive model code for speed detection card

G03: third version hardware revision

Technical Specifications

Backplane 5VDC powered, typical power consumption 3.3W;

Dual independent sensor input channels, AC input range 0~30Vpp, input impedance＞100kΩ;

Frequency sampling range 0~20kHz, corresponding rotating speed 0~100000RPM, measurement precision ±0.05%FS, resolution 0.1RPM;

Built-in hardware filter and adjustable signal threshold, 1500VAC isolation between field sensor circuit and system backplane;

Operating ambient: -20℃~+70℃, 5%~95%RH non-condensing, hot-swap supported on standard Ovation rack;

Dimension:120×50×165mm, net weight approx 0.32kg.

Interface & Communication Layout

Rear golden finger inserts rack backplane for internal Ovation bus data interaction;

Front terminal block for two-channel speed sensor field wiring (magnetic pickup probe);

Front panel LED indicators: RUN power normal, FAULT module fault, CH1/CH2 channel signal status lamp.

Core Functions

Conditioning weak alternating pulse signal from rotating equipment speed probe, real-time frequency-to-RPM calculation;

Cyclic upload measured speed data to Ovation main controller for display, closed-loop speed control and overspeed protection logic trigger;

Per-channel open-circuit/short-circuit/signal loss self-diagnosis, fault alarm information automatically uploaded to DCS historical log;

Online calibrate speed coefficient and threshold via Ovation configuration software without module offline;

Dual channel independent sampling, single channel abnormal does not affect another channel measurement.

Application Scenarios

Thermal power steam turbine/generator rotating speed monitoring, feed pump & induced draft fan overspeed protection; petrochemical large compressor unit speed collection, gas turbine safety interlock measurement, old Ovation DCS spare replacement stocking.

Operation & Maintenance Notes

Use double-core shielded twisted wire for speed probe wiring, separate from high-voltage power cable to avoid electromagnetic interference;

Single-point shield grounding at cabinet terminal, regularly check probe clearance and terminal crimp tightness;

Calibrate speed scaling factor after sensor replacement to ensure measured value consistency with on-site tachometer.