Is it Possible to run MARK VI Simplex System With Single VPRO Module?

 

The main purpose of the VPRO is to provide independent ("emergency") electrical over speed protection, independent of the "primary" electrical over speed protection in the control processor(s) (<R> for a SIMPLEX; <R>, <S>, and <T> for a TMR panel).

GE deems it necessary to have triple redundant emergency electrical over speed protection, even if the panel is a SIMPLEX, and, yes, even if it has mechanical over speed bolt(s) (a older two-shaft machine might have two mechanical over speed bolts).

So, I don't believe that Toolbox can programmed for anything less then triple redundant VPROs, even if the panel is a SIMPLEX turbine control panel.

 

Above this can we run MarkVI configuration in TMR (R/S/T) with VPRO (X/Y/Z). However, while power on just ON only two racks and their VPRO. whether in this condition, MarkVI will attend the final control & I/O states..!

 

Sir,

Can we powerup MarkVI TMR panel with two racks & two VPRO in service. whether in this condition it will achieve final control state & final IO state.

If not what are other alternatives to communicate with a TMR panel??

 

Dharmesh,

Your post is unclear.

Yes; you can power-up a Mark VI TMR panel with only two of three processor racks and two of three VPROs in service. And, the HMI can establish communications with the panel with both CIMPLICITY and Toolbox.

However, it will not be possible to achieve a ready-to-start status in order to be able to start a unit with this configuration. It will achieve final control state, enabling outputs.

The philosophy is that to be able to start a unit all processors, racks, and the <P> core (all three VPROs) must be healthy and communicating with each other in order to be able to initiate a unit START (a ready-to-start status and a START signal accepted initiating a start sequence). Once the start sequence is underway, it's supposed to be possible to "lose" a single processor rack or a single VPRO and continue with the start sequence up to and including synchronization and loading.

That's the ideal. It works sometimes, and it doesn't work other. It all seems to depend on the version of Toolbox and cards and Pcode ("firmware") being used, and the card or cards which have failed.

And, no, there is no matrix to understand what conditions or hardware allow a start under these conditions and which don't. All should, but some don't, and about the only way to find out which don't is to be unfortunate enough to have the "right" combination. But, as far as I know, all three processor racks and all three VPROs must be in controlling mode (outputs enabled) and communicating properly with each other in order to be able to initiate a START, and only after that can a single processor or single VPRO be "lost" or powered-down and the turbine continue to run.

I have heard of some very creative people who have been able to force enough values to get a ready-to-start indication, but I believe the <P> core still blocked pick-up of the trip solenoids.

I also believe that all three processors and all three VPROs have to go to controlling state, to enable outputs, to even begin controlling the turbine under any circumstances.