Danfoss VLT HVAC Drive FC 100 Operating Instructions Manual

Also see for VLT HVAC FC 100: Service manual Operating instructions Instruction manual

Contents

Danfoss VLT HVAC Drive FC 100 Operating Instructions Manual Manual pdf 76 page image

4.3. Parameter Descriptions4.3.1. Parameter Set-UpGroup Title Function0- Operation and Display Parameters used to program the fundamental functions of the frequency converterand the LCP including: selection of language; selection of which variables are dis-played at each position in the display (e.g. static duct pressure or condenser waterreturn temperature can be displayed with the setpoint in small digits in the top rowand feedback in large digits in the centre of the dispay); enabling/disabling of theLCP keys/buttons; passwords for the LCP; upload and download of commissionedparameters to/from the LCP and setting the built in clock.1- Load / Motor Parameters used to configure the frequency converter for the specific application andmotor including: open or closed loop operation; type of application such as com-pressor, fan or centrifual pump; motor nameplate data; auto-tuning of the drive tothe motor for optimum performance; flying start (typically used for fan applications)and motor thermal protection.2- Brakes Parameters used to configure braking functions of the frequency converter whichalthough not common in many HVAC applications, can be useful on special fan ap-plications. Parameters including: DC braking; dymamic/resistor braking and overvoltage control (which provides automatic adjustment of the deceleration rate (auto-ramping) to avoid tripping when decelerating large inertia fans)3- Reference / Ramps Parameters used to program the minimum and maximum reference limits of speed(RPM/Hz) in open loop or in actual units when operating in closed loop); digital/presetreferences; jog speed; definition of the source of each reference (e.g. which analoginput the reference signal is connected to); ramp up and down times and digitalpotentiometer settings.4- Limits / Warnings Parameters used to program limits and warnings of operation including: allowablemotor direction; minimum and maximum motor speeds (e.g. in pump applications itis typical to program a minimum speed to approx 30-40% to ensure pump seals areadequately lubricated at all times, avoid cavitation and ensure adequate head is pro-duced at all times to create flow); torque and current limits to protect the pump, fanor compressor driven by the motor; warnings for low/high current, speed, reference,and feedback; missing motor phase protection; speed bypass frequencies includingsemi-automatic setup of these frequencies (e.g. to avoid resonance conditions oncooling tower and other fans).5- Digital In / Out Parameters used to program the functions of all digital inputs, digital outputs, relayoutputs, pulse inputs and pulse outputs for terminals on the control card and alloption cards.6- Analog In / Out Parameters used to program the functions associated with all analog inputs and an-alog outputs for the terminals on the control card and General Purpose I/O option(MCB108) (note: NOT Analog I/O option MCB109, see parameter group 26-00) in-cluding: analog input live zero timeout function (which for example can be used tocommand a cooling tower fan to operate at full speed if the condenser water returnsensor fails); scaling of the analog input signals (for example to match the analoginput to the mA and pressure range of a static duct pressure sensor); filter timeconstant to filter out electrical noise on the analog signal which can sometimes occurwhen long cables are installed; function and scaling of the analog outputs (for ex-ample to provide an analog output representing motor current or kW to an analoginput of a DDC controller) and to configure the analog outputs to be controlled bythe BMS via a high level interface (HLI) (e.g. to control a chilled water valve) includingability to define a default value of these outputs in the event of the HLI failing.8- Communication andOptionsParameters used for configuring and monitoring functions associated with the serialcommunications / high level interface to the frequency converter9- Profibus Parameters only applicable when a Profibus option is installed.10- CAN Fieldbus Parameters only applicable when a DeviceNet option is installed.11- LonWorks Parameters only applicable when a Lonworks option is installed.13- Smart Logic Controller Parameters used to configure the built in Smart Logic Controller (SLC) which can beused for simple functions such as comparators (e.g. if running above xHz, activateoutput relay), timers (e.g. when a start signal is applied, first activate output relayto open supply air damper and wait x seconds before ramping up) or a more complexsequence of user defined actions executed by the SLC when the associated userdefined event is evaluated as TRUE by the SLC. (For example, initiate an economisermode in a simple AHU cooling application control scheme where there is no BMS. Forsuch an application the SLC can monitor the outside air relative humidity and if it isbelow a defined value, the supply air temperature setpoint could be automaticallyincreased. With the frequency converter monitoring the outside air relative humidityand supply air temperature via it’s analog inputs and controlling the chilled watervalve via one of the extended PI(D) loops and an analog output, it would then mod-ulate that valve to maintain a higher supply air temperature). The SLC can oftenreplace the need for other external control equipment.Table 4.2: Parameter Groups4. How to ProgrammeVLT® HVAC DRIVE High PowerOperating Instruction76 MG.11.F1.02 - VLT® is a registered Danfoss trademark4