Product Details
Product Description
Product Description
Brand: ABB
Type:UNITROL 1020 UNS0119A-Z,V1 3BHE030579R0003
Origin: the Swiss
Warranty: 365 days
Colour: new/used
Shipping method: Courier delivery
Module of PLC, DCS, ESD system card, the card is a vibration monitoring system, steam turbine control system module, the advantages of the gas generator spare parts brand: Allen Bradley, BentlyNevada, ABB, Emerson Ovation, Honeywell DCS, Rockwell ICS Triplex, FOXBORO, Schneider PLC, GE Fanuc, Motorola, HIMA, TRICONEX, Prosoft etc. Various kinds of imported industrial parts of our products are widely used in metallurgy, petroleum, glass, aluminum manufacturing, petrochemical industry, coal mine, papermaking, printing, textile printing and dyeing, mechanical, electronic manufacturing, automobile manufacturing, plastic machinery, electric power, water conservancy, water treatment/environmental protection, boiler heating, energy, power transmission and distribution and so on.
If the unit is driving a generator and no “Select On-Line Dynamics” contact input is programmed, the Speed Off-Line dynamics are used by the Speed PID when the generator or utility tie breaker contacts are open. The speed On-Line dynamics are used by the speed PID when the generator and utility tie breaker contacts are closed. If the speed dynamics select contact is programmed, the generator and utility tie contacts do not effect the dynamics selection. If the unit is not driving a generator and no “Select On-Line Dynamics” contact input is programmed, the Speed Off-Line dynamic settings are used when the turbine speed is below minimum governor speed; .On-Line dynamics are used if the turbine speed is above minimum governor speed. If the speed dynamics select contact is programmed, the turbine speed does not effect the dynamics selection. A relay can be programmed to indicate that the On-Line Dynamics mode is selected. Cascade, Auxiliary, Or EXTR/ADM Droop The Cascade, Auxiliary, and Extr/Adm controllers can be programmed to use droop for control loop stability. If the parameter being controlled (Casc, Aux, Extr/Adm) is also being controlled by another device (letdown station, boiler, or other turbine), droop is typically required for control loop stability. If required, no less than 5% droop is recommended for stable operation.
Tuning Derivative The value of the Derivative Ratio (DR) term can range from 0.01 to 100. If unsure of the correct value, set the Speed control’s DR term to 5% and the Aux, Cascade, & Extr/Adm controllers’ DR terms to 100%. In order to simplify adjustment of the dynamics, adjusting the integral gain value sets both the I and D terms of the PID controller. The DR term establishes the degree of effect the integral gain value has on the “D” term, and changes the configuration of a controller from input rate sensitive (input dominant) to feedback rate sensitive (feedback dominant) and vice versa. Another possible use of the DR adjustment is to reconfigure the controller from a PID to a PI controller. This is done by adjusting the DR term to its upper or lower limits, depending on whether an input or feedback dominant controller is desired.
• A DR setting of 1 to 100 selects feedback dominant mode. • A DR setting of .01 to 1 selects input dominant mode. • A DR setting of .0101 or 100 selects a PI only controller, input and feedback dominant respectively. The change from one of these configurations to the other may have no effect during normal operation, however, it can cause great differences in response when the governor is coming into control. (i.e. at startup, during a full load change, or during transfer of control from another channel). An input dominant controller is more sensitive to the change-of-rate of its input (Speed, Cascade in, Auxiliary in, or Extr/Adm in), and can therefore prevent overshoot of the setpoint better than a feedback dominant controller. Although this response is desirable during a startup or full load rejections, it can cause excessive control motions in some systems where a smooth transition response is desired.
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