Installation Operation Maintenance

Options80 - 100% Supply fanFrequency InverterThe 80-100% frequency inverter is afactory installed, programmed andtested option, used mainly to loweroperation and maintenance costs.It can be used also to adjust the airflow and for textile ductapplications.The inverters drive the supply fanmotors at 80% or 100% of thenominal speed according to thecooling and the heating capacitysteps of the rooftops. Inverters areelectrically enslaved to thecompressors and gas burnercontactors.High voltage WARNING !The voltage of the frequencyconverter is dangerous wheneverthe converter is connected to mains.Consequently, it is essential tocomply with the instructions in theInverter manual.These rules concern your safety:1. The frequency converter must bedisconnected from the mains ifrepair work is to be carried out.Check that the mains has beendisconnected and that theprescribed time has passedbefore removing motor andmains plugs.2. The [STOP/RESET] key on thecontrol panel of the frequencyconverter does not disconnectthe equipment from mains and isthus not to be used as a safetyswitch.3. The earth leakage currents arehigher than 3.5 mA.4. Do not remove the plugs for themotor - and mains while thefrequency converter is connectedto mains. Check that the mainshas been disconnected and thatthe prescribed time has passedbefore removing motor andmains plugs.5. Note that the frequencyconverter has more voltageinputs than L1, L2 and L3 whenthe DC bus terminals are used.Check that all voltage inputs aredisconnected and that theprescribed time has passedbefore repair work iscommenced.It can be extremely dangerousto touch the electrical partseven when the mains supplyhas been disconnected.Also ensure that other voltageinputs are disconnected fromload sharing through the DCbus.Wait at least 14 minutes afterthe input power has beenremoved before servicing thedrive.WARNING ! against unintendedstart1. The motor can be brought to astop by means of digitalcommands, bus commands,references or a local stop, whilethe frequency converter isconnected to mains. If personalsafety considerations make itnecessary to ensure that nounintended start occurs, thesestop functions are not sufficient.2. While parameters are beingchanged, the motor may start.Consequently, the stop key[STOP/RESET] must always beactivated, following which datacan be modified.3. A motor that has been stoppedmay start if faults occur in theelectronics of the frequencyconverter, or if a temporaryoverload or a fault in the supplymains or the motor connectionceases.In any case, the operator mustbe out of the unit when the unitis connected to mains.24RT-SVX16C-E4