Wednesday, May 23, 2018

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Introduction to SPEEDTRONIC Mark VI

General overview of the control system

The Unit Control Panel (UCP)

• The Speedtronic Mark VI controlling system can be found here

• Connected to all the instrumentations with field cabling

• Controlling the field instruments based on its internal software, the signals received from the field sensors and the operator commands

The Operator Interface (HMI)

• Connected to the Mark VI in the UCP

• Industrial PC running Windows operating system

• The internal software of the Mark VIcan be modified from the HMI

• The operator can monitor the most important field processes on the HMI

• The operator can give commands to the Mark VI through the HMI (e.g. startup the turbine, change the speed)

The Unit Control Panel (UCP)

Mark VI can be in two different configurations:

• Triple Modular Redundant (TMR)  - Employs three identical control processors (<R>, <S> and <T>) and each performs identical operations for redundancy. Very stable and reliable.

• Simplex - Similar like TMR, but employs only a single control processor <R>, without redundancy

• Heavy duty gas turbines - TMR or Simplex Mark VI configuration, turbine maximum shaft speed up to around 5100 RPM

• Aeroderivative gas turbines - Simplex Mark VI configuration, turbine maximum shaft speed up to 10000 RPM or more

The UCP and the HMI

Four main sections:

  • ACP(Aux. Control Panel)

  • TCP(Turbines Control Panel)

  • HIOS( High Input Output Signal)

  • LIOS (Low Input Output Signal)

The UCP Section

The UCP/ ACP section

The UCP/ ACP section

TCP/HIOS/LIOS: The Mark VI controller

UCP additional elements

• Pushbuttons, lamps on the external door

• Terminal boards for field signal connections

• Barriers for protection or signal conversion

UCP door pushbuttons and lamps

UCP terminal boards

UCP barriers

Panel documentation

The Control system schematic

Describes the interconnection between the standalone devices:

  • Unit Control Panel

  • Operator Interface (HMI)

  • DCS

  • Fire & Gas controller

  • Vibration monitor

The Instrument List

Lists all the input and output signals of the UCP including:

  • Signal name

  • Customer tag

  • Signal description

  • Transmitter type

  • Calibration range

• Analog setpoints

Piping and Instrument Diagram (P&ID)

  • Displays all the intruments and sensors present on the field and the connection between them and the Mark VIcontrol system

  • One page of the P&ID describes one coherent part of the instrumentation (e.g. Lube oil system)

  • Usually each P&ID page have a graphic page ordered to it in the HMI

  • This allows the operator to understand and monitor/control all the instrumentation

The Functional description

Describes the Mark VIinternal software explaining each procedure of the control processes, for example:

  • Startup process

  • Shutdown process

  • Different motors, fans, heaters sequences(auxiliary sequences)

Signal identification

  • All a panel documentations are using standard naming for the signals.

  • For example we can find a device name 88HQ:

According the standard naming, the number in the signal name shows the device type:

  -88 motor

  -52 feedback motor is running

  -4 command start/stop motor

  -33 limit switch

  -20 command for electrovalve

  -96 general trasmitter

  -26 temperature signal

  -63 pressure signal

  -71 level signal

  -60 flow transmitter

  -28 flame trasmitter

  -39 vibration

  -77 speed

  -45 Fire and gas trasmitter

  -90 cmd to servovalve

  -65 LVDT

  -49 overload

  -27 undervoltage

  -86 fault

  -3 permissive

According the standard naming, the letters in the signal name shows the signal type:

  -E emergency

  -R ratchet

  -Q oil

  -H hydraulic

  -A auxiliary

  -F fuel

  -G gas

Mark VI software tagname prefixes:

  -L Logic (digital signal 0-1)

  -A Analog signal


  -L52QA → lube oil auxiliary pump running

  -A63HQ → hydraulic oil pressure

  -L33HR → hydraulic ratchet limit switch

Proceed to SPEEDTRONIC Mark VI Hardware Description

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