Control System Components
V
1.3
Control system components
m Operator
Interface
m Controls
Cabinet
m Terminal Rails
m Allen Bradley CLogix chassis
m MK2 controls
chassis
m Interface
modules
m Controlnet
m Overspeed Protection
m Emergency stop
loop
m Motor Control
Centres
Operator interface
l VDU, keyboard
and pushbuttons
l VDU often
touchscreen
l Sometimes
mounted remotely to controls cabinet
l Keyboard slides
or hinges out of controls cabinet if VDU on controls cabinet
l Pushbuttons
soft-wired, time delay applies.
Controls Cabinet
l Contains Control
system hardware
l Terminal rails
around the bottom half
l Control chassis
in top half
l Vent fan used to
cool controller
l Cable entry via
gland plate in bottom
Terminal Rails
l Terminal rails
numbered as per contract drawing
l Generally all
Fire and Gas on one rail
l All DC supplies
on another rail
l Other rails
house interface modules for I/O
Allen Bradley PLC controller
l Control chassis
mounted inside UCP
l Normally 13
slots plus power supply
l PSU on the left
followed by cards
l PLC processor is
Logix 5555 for package and sequence control
l SAM module for
core engine control (fuel and air)
l Other cards are
comms or local I/O
l Most
instrumentation is connected via Controlnet.
MK2 controller
l Up to 4 control
chassis mounted inside TCM
l Up to 15 cards
in each chassis
l I/O cards such
as AIM’s, SIM’s, FIM’s
l PPM for package,
sequence and core engine control
l CEC often run in
separate utility within PPM (BEACON)
l I/O connection
via IFM’s or Controlnet
I/O interface
l Interface
modules, IFM’s, are used to make the field signals compatible with the card
input
l Provide external
relays
l Provide
interface from ribbon cable
l Lots of types
Controlnet
l I/O network made
by Allen Bradley
l Lots of I/O
transmitted over a single network cable
l Dual redundant
l Reduces field
wiring
l Reduces control
system cards
l Can be in
controls cabinet or field mounted
Overspeed protection
l Separate
Overspeed protection
l Mounted in
control cabinet
l Uses MK2 OSM
l Also provides
watchdog for processor
Emergency stop loop
l Emergency stop
pushbuttons around skid
l And at the TCM
l And remotely
(customer)
l Hardwired system
l Inputs from
overspeed and Fire and Gas
l Removes power
from the Fuel block and vent valves
l Latched relay,
reset-able from control interface
Motor Control Centres
l MCC’s
l Low voltage
output from controls activates contactor to put higher voltage onto motor
l Selectable to
Local or Auto
l Overload
protection
l Lamp indication
on front panel
l IDS generally
shows demand not feedback
Generator Control Panel
l GCP, external
supply
l Generator
protection, monitoring and synchronising control
l Modern systems
have a processor based protection relay
Fire and Gas chassis
l HOW fire and Gas
(Tyco)
l Aternative
Detronics or Allestec systems are also used
l Mounted in
control cabinet
l Gas cards
l Zone cards
(UV’s, Heat detectors, MAC’s)
l Extinguishant
cards
l Common
controller
Vibration monitoring
l Vibration
chassis
l BN3500
l Vibration data
sent to controller via MODBUS comms
l Alarm and Trip
data sent by hardwired relay outputs
VGV ram control
l Hydraulic VGV
ram controlled by an ATOS unit
l Converts control
system signal to signal required to drive the ram
l Requires
calibration/setup
l Electric VGV ram
controlled by a Moog driver unit
STAR system
l Small Turbine
Advanced Retrofit
l Throttle valve
control system
l Actuator and
ball valve
l ECU provides
control
l May have
external feedback potentiometer
ECU
lElectronic Control Unit
lUsed to position fuel valves and sometimes VGV ram
lIn retrofit applications on some engine types can be
used to govern the engine
lMounted onskid, offskid or in control cabinet
lCommunication with controller by RS485 or Devicenet
comms
lIf RS485 also some hardwired signals
Integrated Fuel Valve
l Model E Gas Fuel
system packages
l Modular fuel
valve system
l Comprises Block
and vent valves, throttle valves, ECU and instrumentation
l Single I/O
network connection
Batteries and charger
l Lead Acid &
NiCad batteries are used to provide backup power to the TCM
l During normal
operation an Inverter takes supply voltage and feeds a battery charger
l The battery
charger constantly charges the batteries
l The TCM is
normally supplied from the battery charger, in the case of power loss the
batteries provide power to the TCM
Control system components
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