Rockwell Automation T8444 Trusted TMR Pulse Generator and Monitoring Module - Manual

Trusted TM
PD-T8444
Issue 9 Apr 10 PD-T8444 1
Trusted
TM
TMR Pulse Generator and
Monitoring Module
Introduction
The Trusted TM TMR Pulse Generator and Monitoring module interfaces through special Thyristor
Drivers, to two Stepper Motors, which form an integral part of a damper rod control system. The
module is based upon the Trusted
TM T8461 Digital output module. Feedback of Thyristor activation and
rod position is provided by the module as a % Movement figure and a series of fault signals.
Triplicated diagnostic tests are performed throughout the module in order to locate and annunciate
hardware failures. Inputs are treated as analogues and are fully tested by the nature of their operation.
Fault tolerance is achieved through a Triple Modular Redundant (TMR) architecture within the module.
The module has been configured to provide the control and interlock requirements for a high power
stepper motor control system which is used to position Damper Rods in a Nuclear reactor. The
functionality of this module is highly specialised and is detailed later in this PD.
Features
• Two Stepper Motor controls
• Special control algorithms and fault diagnostics resident within the module
• Bi-directional Fast and slow movement
• Emergency stop and hold facility
• Rod position Indication
• Thyristor driver fault indications
• ESD Rod release
• 2500V dc optical isolation barrier
• Automatic over-current protection (per channel), no fuses required (outputs)
• Front panel status LEDs for each point indicate status and field wiring faults
• Front panel module status LEDs indicate module health and operational mode (Active,
Standby, Educated)
• T 6 V Certified IEC 61508 SIL 3