Overview
Manuals
Main Applications
Field Connection Arrangements
Features:
- Provides all necessary input interfaces for a Trusted T8442 TMR Speed Monitor
- Nine speed input channels arranged as three groups of three inputs
- Separate field power inputs for each of the three speed input groups
The T8846C Speed Input Field Termination Assembly (SIFTA) is an integral part of the overall T8442 Speed monitor system. It is DIN rail mounted, containing passive signal conditioning, power distribution and protection components. Each T8442 Speed Monitor Module hot swap pair requires a single T8846C SIFTA when installed in a Trusted system.
The SIFTA has nine identical speed transducer signal conditioning circuits arranged as three groups of three. Each of the three groups is a galvanically isolated entity, with its own field power and I/O signal interfaces. Multiple sensors must be employed for SIL 3 applications.
The T8846C ICS Triplex Trusted Speed Monitor Input FTA Module may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
ICS Triplex T8846C Trusted Speed Monitor Input FTA Module manual(Datasheets), Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Due to its extremely high pulse processing accuracy, the T8846C is primarily used for mechanical protection and overspeed monitoring:
Steam Turbine Control and Trip Systems: Provides real-time shaft speed measurement for high-pressure steam turbines and gas turbines to trigger automatic emergency tripping before mechanical damage reaches its limits.
Industrial Compressors and Pumps: Monitors speed changes in large centrifugal systems in chemical or petrochemical processing plants.
Generator Overspeed Protection: As a fail-safe trigger circuit, it rapidly reduces mechanical load or steam supply when the generator speed exceeds the safe design range.
Active sensors are considered as field powered devices, and are available in two principal varieties:
• Totem Pole output sensors, actively drive their outputs to a positive potential and to ground and do not rely on an external voltage bias.
• Open Collector output sensors, can only actively drive their outputs to ground and rely on an external pull-up resistor to bias the output to a positive potential. The T8846 SIFTA provides the biasing components for this type of sensor.
Passive sensors are considered to be magnetic, inductive pick up devices with no field power
requirements.
