Rockwell Automation T8444 Trusted TMR Pulse Generator and Monitoring Module - Manual (Page 38)

Trusted
TM
Module T8444
Issue 09 Apr 10 PD-T8444 38
6.6. Operation with one thyristor driver removed
The Pulse Generator and Monitoring Module interfaces to two Thyristor drivers from each channel.
The design is such that each channel can operate with one thyristor driver removed. Loss of feedback
from both thyristor drivers of one rod does not affect control of any other rods.
6.7. Detection of a missing pulse
Detection of a missing pulse is primarily intended to detect a failed thyristor in an otherwise working
driver this is found by detecting a dip in the DC waveform.
6.8. Detection of an extra pulse
If an extra pulse is generated this will be caused by a faulty firing of a thyristor.
Shorted Gate Pattern
Normal Waveform
Missing Pulse
Missing Phase
Normal Waveform