ABB CM30 User Manual
Also see for ControlMaster CM30: Communications supplementUser guideUser guideManualManual
                                                                                        | |
Contents
| 
ControlMaster CM30 and CM50Universal process controllers, 1/ 4 and 1/ 2 DIN 8 Templates and FunctionalityIM/CM/ED–EN Rev. B 698.3.3 Cascade with FeedforwardThis template connects 2 PID loops together in order to enhance the control of a Master variable (loop) bymanipulation of a slave loop. The first (master) controller provides the set point for the second (slave)Controller. The 2 controllers are linked internally.To the Master output a feedforward signal is added. This signal is a disturbance variable which is weightedby the feedforward ratio and bias values. . When the auto/manual mode is changed via the front panel or bya digital signal both the master and slave controllers change mode, the slave setpoint can then be adjustedfrom the front panel, and this value is then tracked by the Master controller (taking account of thefeedforward signal) to ensure a bumpless transfer back into auto mode.8.3.4 Ratio Controller (Internal / External Ratio)The ratio controller template configures the ControlMaster to regulate one process variable against anotherbased on a specified ratio. The unregulated variable or 'wild' variable is weighted by ratio and bias valuesand this forms the control setpoint for the process variable. The ratio value applied to the wild variable caneither be a local value set on the front panel or a remote signal on an analog input.A/MDVL/RMSPAIN 1AIN 2 x Ratio+ BiasLSPT1LSPT2LSPT3LSPT4LocalSet PointLocalSet PointLoop 1 PIDControl (Master)PIDO/P2 OPTime PropOutputMotorizedValveSplitOutputAO1RLY1RLY2RLY1OP2OP1Output TypeAnalogOutputManualOutputMPV SSPLRSPVLoop 2PIDControl(Slave)AIN 4AIN 3* x FF Gain*Source can be changed in Control / FeedForward configuration – see Section 7.4, page 36RSPPIDPIDO/P 1AIN 1AIN 2AIN 3LocalRatioManualOutputA/MOPPIDO/PLoop1PID ControlPVSPAnalogOutputOutput TypeAO1PV – BiasWVWV WV x Ratio+ BiasActualRatio |
Related manuals for ABB ControlMaster CM30
This manual is suitable for:
manualsdatabase
Your AI-powered manual search engine