Danfoss VLT HVAC Basic Drive FC 100 Series Design Manual

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Danfoss VLT HVAC Basic Drive FC 100 Series Design Manual Manual pdf 70 page image

Conversion index Conversion factor74 0.12 1001 100 1-1 0.1-2 0.01-3 0.001-4 0.0001-5 0.000017.4.13 Process Words (PCD)The block of process words is divided into two blocks of16 bits, which always occur in the defined sequence.PCD 1 PCD 2Control (master⇒ slave Control word) Reference-valueControl (slave ⇒ master) Status word Present outputfrequency7.5 Examples7.5.1 Writing a Parameter ValueChange 4-14 Motor Speed High Limit [Hz] to 100Hz.Write the data in EEPROM.PKE = E19E Hex - Write single word in 4-14 Motor SpeedHigh Limit [Hz]:IND = 0000 HexPWEHIGH = 0000 HexPWELOW = 03E8 HexData value 1000, corresponding to 100Hz, see7.3.12 Conversion.The telegram looks like this:E19E HPKE IND PWE high PWE low0000 H 0000 H 03E8 H130BA092.10Note: 4-14 Motor Speed High Limit [Hz] is a single word, andthe parameter command for write in EEPROM is “E”.Parameter number 4-14 is 19E in hexadecimal.The response from the slave to the master is:119E HPKE IND PWE high PWE low0000 H 0000 H 03E8 H130BA093.107.5.2 Reading a Parameter ValueRead the value in 3-41 Ramp 1 Ramp up TimePKE = 1155 Hex - Read parameter value in 3-41 Ramp 1Ramp up TimeIND = 0000 HexPWEHIGH = 0000 HexPWELOW = 0000 Hex1155 HPKE IND PWE high PWE low0000 H 0000 H 0000 H130BA094.10If the value in 3-41 Ramp 1 Ramp up Time is 10 s, theresponse from the slave to the master is:130BA267.101155 HPKE IND0000 H 0000 H 03E8 HPWE high PWE low3E8 Hex corresponds to 1000 decimal. The conversionindex for 3-41 Ramp 1 Ramp up Time is -2, i.e. 0.01.3-41 Ramp 1 Ramp up Time is of the type Unsigned 32.7.6 Modbus RTU Overview7.6.1 AssumptionsDanfoss assumes that the installed controller supports theinterfaces in this document, and strictly observe allrequirements and limitations stipulated in the controllerand frequency converter.7.6.2 What the User Should Already KnowThe Modbus RTU (Remote Terminal Unit) is designed tocommunicate with any controller that supports theinterfaces defined in this document. It is assumed that theuser has full knowledge of the capabilities and limitationsof the controller.7.6.3 Modbus RTU OverviewRegardless of the type of physical communicationnetworks, the Modbus RTU Overview describes the processa controller uses to request access to another device. Thisprocess includes how the Modbus RTU responds toRS-485 Installation and Set... VLT HVAC Basic Drive Design GuideMG.18.C2.02 - VLT® is a registered Danfoss trademark 697 7