S
Hi Users,
We have GE's Frame V Gas Turbine Unit with generation capacity of 20MW. The Control system of the machine is Speedtronic's MARK-VI based control system. Recently, we faced a problem in the control system and due to communication failure between the cores, the machine got tripped. We didn't have spares with us, so the downtime ran into approximately 96 hours. The spares were arranged somehow from other sites and the control system was revived. But this is besides the point.
The main issue is related to Ratchet Sequencer Mechanism. Since, the MARK-VI control system was completely out of the picture, the ratchet mechanism or the 'cooldown cycle' could not be operated from control system. In such situations, we are supposed to use jogging option from the field.
But, for the convenience of operator's we designed a small circuit using a timer. In this circuit, a run command to ratchet motor and close command for 20CS was given at an interval of 3 minutes for a period of 15 seconds. Though this circuit bypasses 33HR Limit Switch Feedback, but the purpose of Ratcheting was served without the operator having to visit the field, every 3 minutes for the job.
My question is, can this circuit be built and kept ready as a prototype? Are there any downsides to using this circuit? We may have developed a circuit without looking at the repercussions in details. Are we missing out on any downfalls?
Regards
Sadiya
We have GE's Frame V Gas Turbine Unit with generation capacity of 20MW. The Control system of the machine is Speedtronic's MARK-VI based control system. Recently, we faced a problem in the control system and due to communication failure between the cores, the machine got tripped. We didn't have spares with us, so the downtime ran into approximately 96 hours. The spares were arranged somehow from other sites and the control system was revived. But this is besides the point.
The main issue is related to Ratchet Sequencer Mechanism. Since, the MARK-VI control system was completely out of the picture, the ratchet mechanism or the 'cooldown cycle' could not be operated from control system. In such situations, we are supposed to use jogging option from the field.
But, for the convenience of operator's we designed a small circuit using a timer. In this circuit, a run command to ratchet motor and close command for 20CS was given at an interval of 3 minutes for a period of 15 seconds. Though this circuit bypasses 33HR Limit Switch Feedback, but the purpose of Ratcheting was served without the operator having to visit the field, every 3 minutes for the job.
My question is, can this circuit be built and kept ready as a prototype? Are there any downsides to using this circuit? We may have developed a circuit without looking at the repercussions in details. Are we missing out on any downfalls?
Regards
Sadiya