MicroMaster 6SE92 - ECT Sales & Service

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COMBIMASTER & MICROMASTER Integrated8.5.4 Brewery Bottling PlantPressureSensorBottlePlantSetting the PI GainsWhen setting the PI gains, the following should beremembered. Higher gain will result in faster and moreaccurate control, but will also result in less stable operationand potential oscillation.When setting the P gain, switch on the COMBIMASTER, andincrease P202 (P gain) until the system just starts to becomeunstable, then reduce P202 by about 5%. TheCOMBIMASTER will now be controlling the pressure asaccurately as possible using only proportional control - thereis always some error if the I gain (P203) is 0. This error canbe determined by looking at P210. This shows the actualvalue in %. Subtracting this from the setpoint, gives the errorin %.BeerIn this application, a bottling plant at a brewery needs to havea regulated pressure of 4 bar in the liquid that feeds themachine. The COMBIMASTER is driving a pump whichpumps the liquid from the cellar, and regulates the pressureat the machine using the built in PI control function ofCOMBIMASTER.The actual value processor requires a 15V 30mA supply, andprovides a proportional 20mA signal where 20mA represents5 bar, and 0mA represents 0 bar. In this case, a setpoint of0(%) means 0 Bar, and a setpoint of 100(%) means 5 Bar.I.E. The setpoints match the 0 to 20mA range of the sensor.Therefore, to achieve a pressure of 4 Bar, a setpoint of 80%should be used.The COMBIMASTER can both power the actual valueprocessor, and directly interface to the 20mA feedback signalusing the integrated PI interface.A Digital setpoint is used, since the pressure is alwaysrequired to be fixed at 4 Bar (80%)If the error with Proportional gain only is too large, then it willbe necessary to use Integral gain (P203). When using P203,it is normally also necessary to use P207 (Integral Capturerange) to reduce instability, particularly with slow responsesystems. The integral capture range sets the I term to zerowhile the error is large. This prevents a large integral errorfrom building up while ramping to setpoint. A good rule ofthumb is to set P207 to 1.5 times the error with P gain only.The I gain should be set to the lowest value which providesfast enough error elimination. Even very small values (
COMBIMASTER & MICROMASTER Integrated8.6 COMBIMASTER User Interfaces8.6.1 Communications, Operator Control andVisualizationThe operator control and visualization of COMBIMASTER, iscompatible with the MICROMASTER, MICROMASTER Vectorand MIDIMASTER Vector range of standalone inverters.The frequency inverters can be controlled and parameterisedat the inverter itself or externally via the interfaces provided.1. At the inverter via:• The built in potentiometer and signal LEDs• The control terminal strip• The optional OPM2 clear text display (control andparameterisation)2. Externally via:• The serial RS 485 interface• The optional OPM2 clear text display• The optional PROFIBUS module• A PC with SIMOVIS8.6.2 Built-in Potentiometer and Signal LEDsThe COMBIMASTER is shipped factory configured, to becontrolled via the built in potentiometer. The potentiometer isconfigured to give a stop command when fully anticlockwise,and to control the speed of the motor in the range of 0 to50Hz (0 to 3000rpm for a 2 pole motor, and 0 to 1500 rpm fora 4 pole motor) as shown in the diagram below.0HzOff50HzNote that if the potentiometer is not set fully anticlockwisewhen power is applied, it will need to be turned fullyanticlockwise before the motor will start. This preventsunexpected motor starting at switch on.To use the potentiometer to start and stop, it is necessary tofit a wire link into either DIN1 to +15, or DIN2 to +15. Thisalso allows the direction of rotation to be selected. (Link toDIN 1 causes forwards rotation on right. Link to DIN 2 causesreverse rotation on left (10V output from the inverter may beused instead of the 15V.It is also possible to control the start/stop of theCOMBIMASTER from the DIN 1 and DIN 2 signals on thecontrol terminal strip. By default, these represent on right, andon left respectively. This means that the potentiometer can beset to a fixed speed, and the motor can be started andstopped, in either direction, by an external switch.Status information is provided via the two LEDs on the side ofthe COMBIMASTER. The following table shows the possiblestatus indications.LED StateCOMBIMASTER StatusGreen YellowON ON Mains power on, COMBIMASTER not running (STANDBY)ON OFF COMBIMASTER running, as per control commands (ON)Flashing Flashing Current limit warningFlashing ON COMBIMASTER over temperatureON Flashing Motor over temperatureOFF ON Other fault (e.g. tripped)OFF Flashing Mains Under voltageOFF OFF Mains supply fault (e.g. faulty external switch)By default, it is possible to clear trip conditions using DIN3Siemens DA 64 – 1998/99 8/23
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Standard ApplicationsMICROMASTERMIC
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Communications/InterfacesMICROMASTE
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Inverter Selection and Ordering Dat
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MicroMaster 6SE92 - ECT Sales & Service

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