Overview
Configured for pulse signal measurement in the Trident safety system, the Invensys Triconex PI3381 (PI3381 TMR pulse input module) provides six channel-isolated pulse inputs for magnetic, active, and open-collector sensors. The differential input circuit supports pulse frequency measurement from 0.5 Hz to 32 kHz, with a specified speed range of 0 to 32,000 RPM.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PI3381 |
| Brand | Invensys |
| System | Trident safety system |
| Module Type | TMR pulse input module |
| Input Points | 6 channel-isolated inputs |
| Input Circuit | Differential, commoned ground |
| Sensor Compatibility | Magnetic, active, and open collector |
| Maximum Operating Voltage | +/-33 VDC |
| Differential Sensitivity | 500 mV peak-to-peak above 2 Hz |
| Single-ended Sensitivity | 1 V peak-to-peak above 2 Hz |
| Speed Range | 0 to 32,000 RPM |
| Frequency Range | 0.5 Hz to 32 kHz |
| Duty Cycle | 20 to 80%, or 10 us minimum pulse |
| Maximum Slew Rate | 4,000 Hz/s with 60 gear teeth |
| Gear Teeth Setting | 1 to 255 |
| Resolution | 24 bits |
| High-range Accuracy | +/-0.01% from 2 to 32 kHz |
| Minimum Update Rate | 20 ms |
TMR Pulse Signal Processing
The PI3381 uses a TMR pulse input architecture for pulse measurement within the Trident safety system. Its six channel-isolated inputs accept magnetic, active, and open-collector sensor signals.
The differential input specification provides 500 mV peak-to-peak sensitivity above 2 Hz. For single-ended signals, the specified sensitivity is 1 V peak-to-peak above 2 Hz. The input circuit uses a commoned ground arrangement.
The module supports frequencies from 0.5 Hz to 32 kHz and speeds from 0 to 32,000 RPM. Therefore, the pulse frequency must remain within the specified measurement range. The gear teeth setting can be configured from 1 to 255, allowing the pulse measurement to correspond to the monitored rotating equipment.
The module provides 24-bit resolution. At the high frequency range from 2 to 32 kHz, the specified accuracy is +/-0.01%. The minimum update rate is 20 ms.
Frequently Asked Questions
Q: What sensor types can the PI3381 accept?
A: The PI3381 supports magnetic, active, and open-collector pulse sensors.
Q: What pulse frequency range does the PI3381 support?
A: The specified frequency range is 0.5 Hz to 32 kHz. The high-range accuracy specification applies from 2 to 32 kHz.
Q: What gear tooth settings are available?
A: The gear teeth setting ranges from 1 to 255. The specified maximum slew rate is 4,000 Hz/s when using 60 gear teeth.
Field Installation Guidelines
Install the PI3381 in the designated Trident system hardware and match the module with the installed chassis, baseplate, cable, and field termination arrangement.
Verify the module identification and connector configuration before wiring. Confirm that the connected pulse sensor type matches the supported magnetic, active, or open-collector input configuration.
Keep pulse signal wiring separated from high-current power conductors and other high-noise circuits where practical. Use appropriate cable shielding for the installed signal environment and terminate the shield according to the project grounding specification.
Before commissioning, verify the sensor polarity, signal amplitude, pulse frequency, gear tooth setting, and expected rotational speed. Confirm that the measured pulse frequency remains within the specified 0.5 Hz to 32 kHz range.
Do not apply a signal exceeding the specified +/-33 VDC maximum operating voltage. Also verify the expected duty cycle and minimum pulse width before placing the measurement channel into service.
Check the module nameplate, hardware revision, connector layout, system configuration, and project documentation before replacing an installed unit.
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