Danfoss VLT 8000 AQUA series Operating Instructions Manual

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Danfoss VLT 8000 AQUA series Operating Instructions Manual Manual pdf 182 page image

VLT ® 8000 AQUA■ Calculation of resulting referenceThe calculation made below gives the resultingreference when parameter 210 Reference type isprogrammed for Sum [0] and Relative [1], respectively.External reference is the sum of references fromterminals 53, 54, 60 and serial communication.The sum of these can never exceed parameter205 Max. reference. External reference canbe calculated as follows:(Par. 205 Max. ref. - Par. 204 Min. ref.) x Ana. signal Te rm. 53 [V](Par. 205 Max. ref. - Par. 204 Min. ref.) x Ana. signalTerm. 54 [V]Ext. ref.= Par. 310 Term. 53 Max. scaling - Par. 309Term. 53 Min. scaling+ Par. 313 Term. 54 Max. scaling - Par. 312Term. 54 Min. scaling+(Par. 205 Max. ref. - Par. 204 Min. ref.) x Par. 314 Term.60 [mA]serial com. reference x (Par. 205 Max. ref. - Par. 204Min. ref.)Par. 316 Term. 60 Max. scaling - Par. 315Term. 60 Min. scaling+16384 (4000 Hex)Par. 210 Reference type is programmed = Sum [0].(Par. 205 Max. ref. - Par. 204 Min. ref.) x Par. 211-214Preset ref.Res. ref.= 100+ External ref. + Par. 204 Min. ref. + Par. 418/419Setpoint(only in closed loop)Par. 210 Reference type is programmed = Relative [1].External reference x Par. 211-214 Preset ref.Res.ref. = 100 + Par. 204 Min. ref. + Par. 418/419 Setpoint (only in closedloop)■ Galvanic isolation (PELV)*PELV offers protection by way of extra low voltage.Protection against electric shock is considered to beensured when the electrical supply is of the PELVtype and the installation is made as described inlocal/national regulations on PELV supplies.In VLT 8000 AQUA all control terminals as well asterminals 1-3 (AUX relay) are supplied from or inconnection with extra low voltage (PELV).Galvanic (ensured) isolation is obtained by fulfillingrequirements concerning higher isolation andby providing the relevant creapage/clearancedistances. These requirements are describedin the EN 50178 standard.The components that make up the electricalisolation, as described below, also comply with therequirements concerning higher isolation and therelevant test as described in EN 50178.The galvanic isolation can be shown in threelocations (see drawing below), namely:1. Power supply (SMPS) incl. signal isolation of UDC ,indicating the intermediate current voltage.2. Gate drive that runs the IGTBs (triggertransformers/opto-couplers).3. Current transducers (Hall effect current transducers).*) 525-600 V units do not meet PELV requirements.A motor thermistor connected to terminals 53/54must be double isolated to obtain PELV.MG.83.A2.02 - VLT is a registered Danfoss trademark182