VAT PM-4 Installation, Operating And Maintenance

Contents

VAT PM-4 Installation, Operating And Maintenance Manual pdf 16 page image

certifiedQM-Systemgeprüft esQM-SystemISO 9001EN 29001Installation, Operating, and Maintenance InstructionsSeries 64.1VAT Vakuumventile AG, CH-9469 Haag, SchweizTel ++41 81 771 61 61 Fax ++41 81 771 48 30 Email reception@vat.ch http://www.vatvalve.com225590EE2005-04-26 16/169.4 User Information and Recommendations9.4.1 Operation sequence of PM controllerInitializationPrior to pressure control the setup sequence needs to be performed. Please refer to chapter ‚2.3 PM Configuration (setup sequence)‘Pressure Control Sequence in LOCAL mode or with ‘S:’ CommandPressure control starts after «PRESSURE MODE» and a «SET POINT» is selected or after a pressure control command is sent to the PMcontroller.9.4.2 How to optimize sensor signal resolutionFull scale signal of the sensor is converted by a 12bit AD converter. The resolution depends therefore on the Voltage Range.Example: Sensor: 1 Torr full scale, 0 to 10 VDC output;Required pressure range: 0 to 120 mTStandard sensor setup on PM: Voltage Range: 0-10V, Display Range: 1, Display Unit: Torr→ Resolution of PM controller: 1Torr * 0.03% = 0.3mTRecommended for sensor setup: Voltage Range: 0-2V, Display Range: 0-200, Display Unit: mTorr→ Resolution of PM controller: 200mTorr * 0.03% = 0.06mTValvePositionControl ModePressureValveOPENGas flow

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