Dear team members,
From last few months , we are facing a problem with control valves with GE Masoliniean SVI II FF(SVI3211) positioner. Without any reason, valves go to CNF/OOP mode from AUT/MAN mode. CNF is actually a communication failure error in Yokogawa DCS and OOP is output open . We are using Centum VP at our plant. SVI II FF models are fairly new positioners from GE and we started upgrading in year 2019. Following is the sequence of events that occurs:
Valve in Auto mode--->Valve goes to OOP mode--->After 10~15sec, valve goes to CNF mode--->After 10~15 sec, valve returns to MAN mode
So we discussed this issue with GE and Yokogawa and based on their recommendations, we did the following activities:
1. DCS ALF card replaced by new one
2. Mega Block replaced by new one
3. Branch cable replaced by new one
4. FF Firmware version up-grade done
5. Resource Block Parameter adjusted (i) like alert key set to 1, (ii) Grant All permission, (iii) Write priority set to 15
6. FF physical layer measurement done (Unbalance, noise, jetter, segment voltage, signal level …..all are ok)
7. FF Power supply replacement done
8. Calibration & Tuning done
9. Cable route check
10. Grounding check
Even after doing all these activities, we are still facing the same issue. Both GE as well as Yokogawa are clueless about this issue. So a little help is needed from everyone here.
From last few months , we are facing a problem with control valves with GE Masoliniean SVI II FF(SVI3211) positioner. Without any reason, valves go to CNF/OOP mode from AUT/MAN mode. CNF is actually a communication failure error in Yokogawa DCS and OOP is output open . We are using Centum VP at our plant. SVI II FF models are fairly new positioners from GE and we started upgrading in year 2019. Following is the sequence of events that occurs:
Valve in Auto mode--->Valve goes to OOP mode--->After 10~15sec, valve goes to CNF mode--->After 10~15 sec, valve returns to MAN mode
So we discussed this issue with GE and Yokogawa and based on their recommendations, we did the following activities:
1. DCS ALF card replaced by new one
2. Mega Block replaced by new one
3. Branch cable replaced by new one
4. FF Firmware version up-grade done
5. Resource Block Parameter adjusted (i) like alert key set to 1, (ii) Grant All permission, (iii) Write priority set to 15
6. FF physical layer measurement done (Unbalance, noise, jetter, segment voltage, signal level …..all are ok)
7. FF Power supply replacement done
8. Calibration & Tuning done
9. Cable route check
10. Grounding check
Even after doing all these activities, we are still facing the same issue. Both GE as well as Yokogawa are clueless about this issue. So a little help is needed from everyone here.