Description
Product Overview
TQ412 (Part No:111-412-000-013) is a high precision tachometer / speed monitoring module manufactured by Vibro-Meter (currently part of Meggitt). It is designed for turbine and rotating machinery protection systems, used to measure shaft rotational speed, overspeed detection and zero-speed supervision. The module processes pulse signals from magnetic pickups or active speed probes and converts them into digital speed values for machinery protection and control systems. Widely deployed in steam turbine, gas turbine and generator supervision racks.
Technical Specifications
| Item | Parameter |
|---|---|
| Manufacturer | Vibro-Meter (Meggitt) |
| Part Number | TQ412, 111-412-000-013 |
| Product Type | Tachometer / Overspeed Monitoring Module |
| Signal Input | Magnetic pickup (MPU) or active speed probe pulse input |
| Measuring Range | 0 ~ 20,000 RPM |
| Input Frequency Range | 0 Hz ~ 20 kHz |
| Power Supply | 24 VDC |
| Output | Digital speed value, relay alarm/trip outputs, analog speed output |
| Mounting | Rack plug-in module for Vibro-Meter VM600 system |
| Operating Temperature | -20 °C ~ +60 °C |
| Humidity | 5%–95% RH, non-condensing |
| Weight | Approx. 0.32 kg |
| System Compatibility | VM600 machinery monitoring platform |
Key Features
- High Precision Rotational Speed Measurement: Processes pulse signals from shaft speed sensors to calculate real-time shaft RPM for rotating equipment.
- Overspeed & Zero Speed Protection: Configurable alarm and trip thresholds for overspeed, underspeed and zero-speed interlock protection.
- Dual Channel Input Option: Supports redundant speed probe inputs to improve reliability for critical turbine applications.
- Integrated Relay Outputs: Programmable relay contacts for local alarm and hardwired trip interlock to ESD or turbine protection logic.
- Onboard Diagnostics: Continuous sensor cable break, short circuit and signal amplitude monitoring, fault indication via front panel LEDs.
- VM600 Rack Hot Swap: Plug-in card design, can be replaced online without shutting down the whole VM600 rack under proper operational permission.
Applications
- Gas turbine and steam turbine overspeed protection
- Generator shaft speed monitoring in thermal / combined cycle power plants
- Compressor, pump and large rotating machinery condition monitoring
- Petrochemical and offshore rotating equipment supervision
- Hydro turbine speed supervision systems
Installation & Maintenance Notes
- Install the TQ412 module in the designated slot of Vibro-Meter VM600 rack.
- Separate speed probe signal wiring from high-current power cables to reduce electromagnetic interference.
- Verify MPU air gap and pulse signal amplitude before commissioning.
- Configure overspeed trip and alarm thresholds using Vibro-Meter configuration software.
- Check LED status and fault logs periodically during routine plant maintenance.
- Perform overspeed function test during scheduled unit outages to validate trip response.
FAQ
Q: What system does TQ412 111-412-000-013 belong to? A: It is a plug-in module for Vibro-Meter VM600 machinery monitoring system, used for shaft speed and overspeed monitoring.
Q: Can TQ412 work with other brand monitoring racks? A: No, it is designed exclusively for VM600 rack architecture and backplane communication.
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