GE Mark Controls Upgrades Fact Sheet
GE
Energy
Now you can upgrade your Mark* IV gas turbine control to
GE’s latest technology, without changing your existing field
terminations, field wiring, or turbine devices. GE Energy offers a
prefabricated package to enable a seamless Mark IV to Mark VIe
migration, replacing all of the vintage electronics in the existing
Mark IV cabinet. Standard wire harnesses connect the new Mark
VIe I/O to the Mark IV terminal boards with plug-in connectors
to ensure point-to-point connectivity.
Reliability of a Modern Control System
In addition to retaining 100% of your field wiring and turbine
devices, you also retain the same control and protection philosophy
that has delivered operation and tripping reliability all these years.
Your upgraded Mark VIe control will still be triple redundant, but
with improved fault tolerance. For example, failure of an A/D
converter in the Mark IV causes one of the three controllers to
trip, but not in Mark VIe. Also, on-line repair of Mark IV systems
require that one of the three controllers be taken off-line, but the
Mark VIe can be repaired on-line.
Your board racks with hardwired backplanes are replaced with
smart I/O modules with local distributed processors to interface
with turbine devices. This eliminates berg jumpers for addressing,
PROMs to change, and BRAM/EEPROM for non-volatile memory.
I/O Enhancements
Your smart I/O modules will provide features like 1ms time-tags
for all contact inputs for Sequence of Events (SOE) monitoring.
Additionally, the SOE can be synchronized between multiple units
and to a plant time source. Flame scanners will be continuously
monitored to see the actual light intensity instead of the simple
on/off indication of the Mark IV.
Since the I/O modules are distributed via 100MB Ethernet, they
can also be located in adjacent cabinets, such as generator
protection panels to replace RTD monitors or analog meters on
the door. The “25” backup synch check relay is now a function
performed by redundant I/O modules and coordinated with
another set of modules for auto synchronizing.
Even basic power distribution is improved. For example, your Mark
IV has two feeders to isolate critical and non-critical solenoids. The
new I/O has a pair of on-board fuses to isolate every solenoid and
diagnostics to monitor their status.
Operator Interface
The operator interface on the cabinet door is replaced with a
modern HMI in the same location. Now, you have a Proficy*
HMI/SCADA CIMPLICTY* graphics package with accurate turbine
screens, convenient navigation, superior alarm management,
and tools for editing, trending, data analysis, and exporting data.
The logging printer on the door is no longer needed since alarms
are logged in the HMI. Similarly, the new Trip History handles
significantly more points, with better time resolution, and stores
data for 30 trips.
Remote operator panels and Smart Remotes can be replaced with
HMIs and Historians that communicate in client/server configuration
on modern Ethernet networks. HMIs communicate directly with
the redundant controllers, thereby eliminating the existing Mark IV
Communicator module and the need for a backup display. For units
with DCS links, a replica of the Mark IV simple data dump protocol is
available along with Modbus*, OPC, and GSM.
Mark* IV to Mark* VIe Migration
Gas Turbine Controls Upgrade
fact sheet