ABB CAI 04 communication module

ABB CAI 04 communication module

Technical data of product parameters

The 505 controller is designed to control single or dual (split range) actuator
steam turbines (extraction steam turbines require the 505XT version). The 505 is CAI 04
field programmable which allows a single design to be used in many different
control applications and reduces both cost and delivery time. It uses menu driven
software to instruct site engineers on programming the control to a specific
generator or mechanical drive application. The 505 can be configured to operate
as a stand-alone unit or in conjunction with a plant’s Distributed Control System. CAI 04
The 505 control has five PID controllers that can affect the demand of the inlet
steam flow into the turbine; the Speed/load PID controller, the Auxiliary PID
controller, Auxiliary 2 PID controller, and the Cascade PID controller. Depending
on the configuration of the 505, these PIDs interact differently with each other.
Please refer to the Block diagrams listed later in this chapter to fully understand
PID relationships. An additional PID is available as an isolated control loop that is
optional and can be used to drive an independent Analog Output signal (that is
not driving a Steam Valve) for any single loop ancillary control that may be CAI 04
required (such as Seal Gas, Gland Seals, or lube oil pressure loops. When using
the Isolated PID Control, it is recommended to select the “Enable Readback
Fault” option for the Analog Output channel configured as the Isolated PID
Demand. This will trigger an alarm in the 505 if a fault of the output circuit is
detected. By default, Analog Output channels are not configured to produce an
alarm when the output circuit has a fault.

Product picture display

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