Danfoss VLT HVAC Operating Instructions Manual

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Contents

SafetySafetyWARNINGHIGH VOLTAGE!Frequency converters contain high voltage whenconnected to AC mains input power. Installation, start up,and maintenance should be performed by qualifiedpersonnel only. Failure to perform installation, start up, andmaintenance by qualified personnel could result in deathor serious injury.High VoltageFrequency converts are connected to hazardous mainsvoltages. Extreme care should be taken to protect againstshock. Only trained personnel familiar with electronicequipment should install, start, or maintain this equipment.WARNINGUNINTENDED START!When the frequency converter is connected to AC mains,the motor may start at any time. The frequency converter,motor, and any driven equipment must be in operationalreadiness. Failure to be in operational readiness when thefrequency converter is connected to AC mains could resultin death, serious injury, equipment, or property damage.Unintended StartWhen the frequency converter is connected to the ACmains, the motor may be started by means of an externalswitch, a serial bus command, an input reference signal, ora cleared fault condition. Use appropriate cautions toguard against an unintended start.WARNINGDISCHARGE TIME!Frequency converters contain DC-link capacitors that canremain charged even when the frequency converter is notpowered. To avoid electrical hazards, disconnect AC mains,any permanent magnet type motors, and any remote DC-link power supplies, including battery backups, UPS andDC-link connections to other frequency converters. Wait forthe capacitors to fully discharge before performing anyservice or repair work. The amount of wait time is listed inthe Discharge Time table. Failure to wait the specified timeafter power has been removed before doing service orrepair could result in death or serious injury.Voltage (V) Minimum waiting time (minutes)4 15200-240 0.25-3.7 kW 5.5-37 kW380-480 0.25-7.5 kW 11-75 kW525-600 0.75-7.5 kW 11-75 kW525-690 n/a 11-75 kWHigh voltage may be present even when the warning LEDs areoff!Discharge TimeSymbolsThe following symbols are used in this manual.WARNINGIndicates a potentially hazardous situation which, if notavoided, could result in death or serious injury.CAUTIONIndicates a potentially hazardous situation which, if notavoided, may result in minor or moderate injury. It mayalso be used to alert against unsafe practices.CAUTIONIndicates a situation that may result in equipment orproperty-damage-only accidents.NOTEIndicates highlighted information that should be regardedwith attention to avoid mistakes or operate equipment atless than optimal performance.ApprovalsTable 1.2Safety VLT® HVAC Drive Operating InstructionsMG11AH02 - VLT® is a registered Danfoss trademark