Danfoss VLT HVAC Drive FC 100 Series Design Manual

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Danfoss VLT HVAC Drive FC 100 Series Design Manual Manual pdf 11 page image

2. Introduction to VLT HVAC Drive2.1. Safety2.1.1. Safety noteThe voltage of the frequency converter is dangerous whenever connected to mains. Incorrect installation of the motor, frequencyconverter or fieldbus may cause damage to the equipment, serious personal injury or death. Consequently, the instructions in thismanual, as well as national and local rules and safety regulations, must be complied with.Safety Regulations1. The frequency converter must be disconnected from mains if repair work is to be carried out. Check that the mains supply has been disconnectedand that the necessary time has passed before removing motor and mains plugs.2. The [STOP/RESET] key on the control panel of the frequency converter does not disconnect the equipment from mains and is thus not to beused as a safety switch.3. Correct protective earthing of the equipment must be established, the user must be protected against supply voltage, and the motor must beprotected against overload in accordance with applicable national and local regulations.4. The earth leakage currents are higher than 3.5 mA.5. Protection against motor overload is set by par. 1-90Motor Thermal Protection. If this function is desired, set par. 1-90 to data value [ETR trip](default value) or data value [ETR warning]. Note: The function is initialised at 1.16 x rated motor current and rated motor frequency. For theNorth American market: The ETR functions provide class 20 motor overload protection in accordance with NEC.6. Do not remove the plugs for the motor and mains supply while the frequency converter is connected to mains. Check that the mains supply hasbeen disconnected and that the necessary time has passed before removing motor and mains plugs.7. Please note that the frequency converter has more voltage inputs than L1, L2 and L3, when load sharing (linking of DC intermediate circuit) andexternal 24 V DC have been installed. Check that all voltage inputs have been disconnected and that the necessary time has passed beforecommencing repair work.Installation at High AltitudesBy altitudes above 2 km, please contact Danfoss regarding PELV.Warning against Unintended Start1. The motor can be brought to a stop by means of digital commands, bus commands, references or a local stop, while the frequency converteris connected to mains. If personal safety considerations make it necessary to ensure that no unintended start occurs, these stop functions arenot sufficient.2. While parameters are being changed, the motor may start. Consequently, the stop key [STOP/RESET] must always be activated; following whichdata can be modified.3. A motor that has been stopped may start if faults occur in the electronics of the frequency converter, or if a temporary overload or a fault inthe supply mains or the motor connection ceases.Warning:Touching the electrical parts may be fatal - even after the equipment has been disconnected from mains.Also make sure that other voltage inputs have been disconnected, such as external 24 V DC, load sharing (linkage of DC intermediate circuit), as well asthe motor connection for kinetic back up. Refer toVLT® HVAC Drive Operating Instructions MG.11.Ax.yy for further safety guidelines.VLT® HVAC Drive Design Guide 2. Introduction to VLT HVAC DriveMG.11.B7.02 - VLT® is a registered Danfoss trademark 112